https://2025.cipherchallenge.org/ 2026-08-12T17:11:12+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2025/06/twitter-card-2025.jpg https://2025.cipherchallenge.org/information/ 2016-03-09T16:05:41+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2016/03/28-vivid-color-colorful-photography-1-1024x578.jpg https://2025.cipherchallenge.org/resources/ 2016-03-09T16:05:42+00:00 https://2025.cipherchallenge.org/information/codebreaking/ 2016-03-09T16:05:43+00:00 https://2025.cipherchallenge.org/information/challenge-archive/ 2016-03-09T16:05:43+00:00 https://2025.cipherchallenge.org/information/handbook/ 2016-03-09T16:05:44+00:00 https://2025.cipherchallenge.org/information/challenge-archive/ncc-2015/ 2016-03-09T16:05:47+00:00 https://2025.cipherchallenge.org/information/challenge-archive/ncc-2014/ 2016-03-09T16:05:47+00:00 https://2025.cipherchallenge.org/submit-answers/ 2016-03-30T07:18:12+00:00 https://2025.cipherchallenge.org/search-teams/ 2017-09-06T10:31:42+00:00 https://2025.cipherchallenge.org/team-map/ 2017-09-27T08:11:12+00:00 https://2025.cipherchallenge.org/register-standard/ 2018-09-07T09:50:55+00:00 https://2025.cipherchallenge.org/registration-step-2-under-13/ 2018-09-20T09:15:36+00:00 https://2025.cipherchallenge.org/choose-registration/ 2018-09-20T11:35:07+00:00 https://2025.cipherchallenge.org/my-account/team/ 2019-08-15T11:22:23+00:00 https://2025.cipherchallenge.org/captain-registration/ 2019-08-23T13:59:13+00:00 https://2025.cipherchallenge.org/registration-map/ 2019-08-28T09:24:48+00:00 https://2025.cipherchallenge.org/the-winners-of-last-years-competition/ 2019-09-28T19:55:30+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2019/09/image-8.png https://2025.cipherchallenge.org/password-reset-under-13s/ 2019-09-30T13:24:17+00:00 https://2025.cipherchallenge.org/password-reset/ 2019-09-30T13:24:29+00:00 https://2025.cipherchallenge.org/how-to-crack-challenge-10b-in-this-years-competition/ 2020-03-27T10:18:51+00:00 https://2025.cipherchallenge.org/resources/lesson-plan/ 2020-03-30T20:05:23+00:00 https://2025.cipherchallenge.org/boss-brain-training/ 2020-04-02T11:03:28+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2020/04/TOP-SECRET-BOSS-Brain-Training.png https://2025.cipherchallenge.org/frequency-counter/ 2020-04-23T11:11:58+00:00 https://2025.cipherchallenge.org/elite/ 2020-09-10T09:45:25+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2020/05/TOP-SECRET-Welcome-to-the-cipher-elite.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Top-Secret-Harry.png http://2025.cipherchallenge.org/wp-content/uploads/2020/05/Congratulations.png http://2025.cipherchallenge.org/wp-content/uploads/2020/05/Boss-Cipher-Elite-ID-card-1.png https://2025.cipherchallenge.org/boss-id-card/ 2020-10-20T15:20:55+00:00 https://2025.cipherchallenge.org/cookie-policy/ 2020-10-22T10:03:51+00:00 https://2025.cipherchallenge.org/schedule/ 2021-08-12T11:04:06+00:00 https://2025.cipherchallenge.org/resources/faqs/ 2021-08-17T11:13:19+00:00 https://2025.cipherchallenge.org/my-account/school-details/ 2021-09-15T12:26:51+00:00 https://2025.cipherchallenge.org/my-account/boss-id/ 2021-09-15T12:26:55+00:00 https://2025.cipherchallenge.org/my-account/details/ 2021-09-15T12:26:59+00:00 https://2025.cipherchallenge.org/2fa-login/ 2021-09-16T10:12:49+00:00 https://2025.cipherchallenge.org/my-account/messages/ 2022-05-30T10:51:37+00:00 https://2025.cipherchallenge.org/teacher-registration/ 2022-09-01T12:47:31+00:00 https://2025.cipherchallenge.org/my-account/teacher-teams/ 2022-09-14T11:37:22+00:00 https://2025.cipherchallenge.org/home/achievement-awards/ 2022-09-14T17:20:19+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/09/CC2022-Medals.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/My-Account-National-Cipher-Challenge-202247.png https://2025.cipherchallenge.org/arokah/ 2023-09-06T13:08:27+00:00 https://2025.cipherchallenge.org/account-login/ 2023-09-07T10:02:55+00:00 https://2025.cipherchallenge.org/boss-music-room/ 2024-08-07T09:08:09+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Grand-Piano.png https://2025.cipherchallenge.org/harrys-2023-christmas-miscellany/ 2024-08-07T09:08:24+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/08/CC2022-BOSS-Library-featured-image.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-10.36.19.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-10.55.11.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.40.26.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.47.01.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Basic-Cryptography-Army-Field-Manual-1950-title-page.png http://2025.cipherchallenge.org/wp-content/uploads/2022/12/Gaines-cover.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.02.38.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.07.29.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.10.15-1024x612.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/TLW-grid-puzzle-2-2048x1436-1.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.21.58-1024x920.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.25.54.png https://2025.cipherchallenge.org/joining-a-team/ 2024-08-07T09:08:28+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Screenshot-2021-09-15-at-18.59.23.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Screenshot-2021-09-15-at-19.02.24.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Screenshot-2021-09-15-at-19.04.03.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Screenshot-2021-09-15-at-19.07.52.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Screenshot-2021-09-15-at-19.09.44-1.png https://2025.cipherchallenge.org/boss-your-cipher-challenge/ 2024-08-28T13:45:56+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/07/Twitter-card-22.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/HS-CryptoCrackers.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/The-Book-Brothers-logo-inverted-1.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Annotation-2021-09-06-155417.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/IMG_2244-scaled.jpg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/IMG_2243-scaled.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/10/CTRLALTELITE3.png http://2025.cipherchallenge.org/wp-content/uploads/2022/10/CTRALTELITE2.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/10/CTRLALTELITE1.jpg http://2025.cipherchallenge.org/wp-content/uploads/2021/08/20210406_150926-scaled.jpg http://2025.cipherchallenge.org/wp-content/uploads/2021/08/20210321_095653-scaled.jpg http://2025.cipherchallenge.org/wp-content/uploads/2021/08/20210525_140231-scaled.jpg http://2025.cipherchallenge.org/wp-content/uploads/2021/08/Claire-Photo21-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2016-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster2018.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2019.png https://2025.cipherchallenge.org/the-invisibles/ 2024-09-10T09:53:24+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2020/07/image.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/07/image-1.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/07/MavisBatey-1.jpg http://2025.cipherchallenge.org/wp-content/uploads/2020/07/RolfNoskwith.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/10/Rejewski.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/Clifford-Cocks-e1725961945914.jpg https://2025.cipherchallenge.org/about-the-boss-agency/ 2024-09-10T10:07:47+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Boss-intelligence-ID-card-Harry-Classified-4.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/Boss-intelligence-ID-card-Jodie-Classified.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2017.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2006.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2008.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/CC2012PosterThumbnail.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2009-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/CC2003PosterThumbnail.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2012.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/File-Removed-Harry.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/CC2020Poster-no-sponsors.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2016.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2015-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2010-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2005.jpg http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2019.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2016-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2014.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster2018.png http://2025.cipherchallenge.org/wp-content/uploads/2022/06/4200-UoS-National-Cypher-Challenge-2021-Poster-A2-V6-PRINT-A4.png http://2025.cipherchallenge.org/wp-content/uploads/2023/08/CC2022-Poster-A4.png http://2025.cipherchallenge.org/wp-content/uploads/2023/08/CC2023-Poster-thumbnail.png https://2025.cipherchallenge.org/leaderboard/ 2024-10-17T16:21:08+00:00 https://2025.cipherchallenge.org/tools/ 2024-12-04T11:29:54+00:00 https://2025.cipherchallenge.org/harrys-christmas-miscellany/ 2024-12-20T17:00:00+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2024/12/Harrys-Christmas-Miscellany-2024.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/Harrys-signature-reversed-with-Santa-hat.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/The_Adventure_of_the_Priory_School_08.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2024/09/bicycle_tracks-e1265092605148.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/The-researchers-first-murder-4.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.07.29.png http://2025.cipherchallenge.org/wp-content/uploads/2024/12/tempImageoWpTl8.jpg https://2025.cipherchallenge.org/wp-content/uploads/2024/12/tempImageV3WTb9-1024x614.jpg http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.21.58-1024x920.png https://2025.cipherchallenge.org/solution-to-heroes-by-skylark/ 2025-01-05T09:00:00+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2024/12/tempImageoWpTl8.jpg https://2025.cipherchallenge.org/leaderboard-2025-part-b/ 2025-01-31T15:24:23+00:00 https://2025.cipherchallenge.org/leaderboard-2025-part-a/ 2025-01-31T15:28:16+00:00 https://2025.cipherchallenge.org/accessibility-statement/ 2025-06-19T14:00:43+00:00 https://2025.cipherchallenge.org/my-account/answers/ 2025-08-12T09:57:48+00:00 https://2025.cipherchallenge.org/teacher-password-reset/ 2025-08-22T14:52:48+00:00 https://2025.cipherchallenge.org/home/about-the-challenge/ 2025-09-12T11:02:44+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/06/Tweet1.png https://2025.cipherchallenge.org/data-protection-accessibility-and-design-code/ 2025-09-12T11:55:16+00:00 https://2025.cipherchallenge.org/carers-and-teachers/ 2025-09-12T12:00:04+00:00 https://2025.cipherchallenge.org/information/rules/ 2025-09-12T12:52:20+00:00 https://2025.cipherchallenge.org/home/prizes-and-certificates/ 2025-09-12T12:53:48+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/09/CC2022-Medals.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/CC2024-Online-Editable-Certificate-pdf.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/CC2022-Medals.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/IMG_0034-scaled.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/04/Blue-GCHQ-Logo-new.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/Trinity-logo.png http://2025.cipherchallenge.org/wp-content/uploads/2023/08/Southampton-Logo-White-punched-1.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/Northrop_Grumman_logo_blue-on-clear_2020.svg.png http://2025.cipherchallenge.org/wp-content/uploads/2024/10/BlueSparkFoundation.png https://2025.cipherchallenge.org/registration-instructions/ 2025-09-16T18:43:40+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Registration-Step-1-836x1024.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Registration-Step-2.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Registration-Step-3.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-16-at-19.37.00.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-16-at-10.00.35-729x1024.png https://2025.cipherchallenge.org/editing-your-account/ 2025-09-16T19:25:46+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Participant-Account-page-1024x613.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-achievements-tab-1-1024x565.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-feedback-1024x565.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-certificates-1024x529.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Your-account-tab-825x1024.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-DONT-delete-your-account-1024x315.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Your-Team-tab-1024x486.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-team-captain-admin-1024x748.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Delegate-team-captaincy-1024x294.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-DONT-Delete-your-team-1024x307.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Messages-tab-alt-1024x675.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Message-alerts.png https://2025.cipherchallenge.org/editing-a-teacher-account/ 2025-09-16T19:37:03+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Teacher-account-page-1-1024x742.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-teacher-achievements-tab-1024x268.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Your-account-tab-1-825x1024.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-DONT-Delete-your-team-1-1024x307.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-School-details-1024x487.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Team-monitoring-tab-1024x789.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-team-admin-1-1024x789.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Messages-tab-alt-1-1024x675.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Message-alerts-1.png https://2025.cipherchallenge.org/accepting-an-invite-to-set-up-a-team/ 2025-09-16T19:53:44+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-16-at-19.37.00.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Your-Team-tab-1-1024x486.png https://2025.cipherchallenge.org/printing-your-certificates/ 2025-09-16T19:55:04+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-certificates-1-1024x529.png https://2025.cipherchallenge.org/home/the-bletchley-park-prize-giving/ 2025-09-16T19:55:37+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/09/CC2022-Medals.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/IMA-photo-1-1.jpeg https://2025.cipherchallenge.org/how-to-bulk-register-and-monitor-multiple-teams/ 2025-09-17T08:00:26+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Bulk-registering-1024x516.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-monitored-teams-list-1024x287.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-monitored-teams-list-1024x287.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-17-at-08.59.58-1024x448.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-17-at-08.57.46-1024x332.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-team-captain-admin-1-1024x748.png https://2025.cipherchallenge.org/teacher-registration-instructions/ 2025-09-17T17:13:42+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-13-at-10.47.50.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Teacher-Registation-Step-1-1024x785.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Teacher-Registration-Step-2-1024x617.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Teacher-Registration-Step-3-1024x664.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Teacher-Registration-Step-3-alt-1024x660.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Teacher-account-page-1024x742.png https://2025.cipherchallenge.org/submitting-getting-feedback/ 2025-09-17T17:22:51+00:00 https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Challenges-page-1024x622.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-Challenge-page-header.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-challenge-deadlines-1-1024x404.png https://2025.cipherchallenge.org/wp-content/uploads/2024/09/CC2024-no-submit-button-1024x188.png http://2025.cipherchallenge.org/wp-content/uploads/2023/09/Screenshot-2023-09-07-at-09.43.03-1024x179.png http://2025.cipherchallenge.org/wp-content/uploads/2023/09/Screenshot-2023-09-07-at-09.42.46-1024x294.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/Screenshot-2025-09-16-at-20.41.42.png https://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-feedback-1-1024x565.png https://2025.cipherchallenge.org/boss-case-archive/ 2025-09-17T17:25:04+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2001-TOP-SECRET-HARRY.png http://2025.cipherchallenge.org/wp-content/uploads/2024/08/cipher-poster-2024.jpg http://2025.cipherchallenge.org/wp-content/uploads/2023/08/CC2023-Poster-thumbnail.png http://2025.cipherchallenge.org/wp-content/uploads/2023/08/CC2022-Poster-A4.png http://2025.cipherchallenge.org/wp-content/uploads/2022/06/4200-UoS-National-Cypher-Challenge-2021-Poster-A2-V6-PRINT-A4.png http://2025.cipherchallenge.org/wp-content/uploads/2021/06/CC2020-Poster.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/File-Removed-Harry.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2019.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster2018.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2017.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2016-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2015.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2014.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2016.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster2011.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2011.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2010.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2009.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2008.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster2007.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2006.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2005.jpg http://2025.cipherchallenge.org/wp-content/uploads/2020/10/Poster2004.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/CC2003PosterThumbnail.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/CC2012PosterThumbnail.png https://2025.cipherchallenge.org/about-our-sponsors/ 2025-09-18T22:10:23+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2024/09/White-GCHQ-Logo-new-500x142px.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/Trinity-logo.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/UKRI_EPSR_Council-Logo_Horiz-Grayscale5BW5D.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/blue-spark-White.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/Northrop-Grumman-logo-white.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/10Degrees-Logo-white.png https://2025.cipherchallenge.org/resources-media/ 2025-09-18T22:13:07+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2020/03/CC202SE_Control_Panel.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/BOSS-Bookshelf-cropped.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Programming-for-Cryptologists-v2.262.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/FdU9okYWYAM3A0D.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2016-1.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster2018.png http://2025.cipherchallenge.org/wp-content/uploads/2020/03/Poster-2019.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/White-GCHQ-Logo-new-500x142px.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/Northrop-Grumman-logo-white.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/image.jpeg https://2025.cipherchallenge.org/resources/challenge-poster/ 2025-09-20T17:59:11+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2024/10/Harrys-signature-reversed.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-A4-final-for-printing-1.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/Boss-intelligence-ID-card-Jodie-Classified.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Boss-intelligence-ID-card-Harry-Classified-4.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/My-Account-National-Cipher-Challenge-202247-1.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/CC2023-gold-medal.png https://2025.cipherchallenge.org/library/ 2025-09-25T15:35:49+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2022/08/CC2022-BOSS-Library-featured-image.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/image-7.png http://2025.cipherchallenge.org/wp-content/uploads/2022/08/81GjJ0EnPL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/08/81BfjViVyL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/08/81hY2EHeA0L.jpg http://2025.cipherchallenge.org/wp-content/uploads/2024/09/A-Good-Girls-Guide-to-Murder.jpg http://2025.cipherchallenge.org/wp-content/uploads/2024/09/Snakehead-cover-image.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/12/Gaines-cover.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/513whcgL._SX317_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51T1yv9-OUL._SX322_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51zca6L9IkL._SX313_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/81Dud7TaCEL._AC_UY436_SEARCH213888_QL65_ML3_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51kQWMGZzL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2024/11/image.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51AUwnUjG6L.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51XKxci6JZL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/image-4.png http://2025.cipherchallenge.org/wp-content/uploads/2024/10/image.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/A-very-short-introductin-to-cryptography.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51SY20JIzL._SX326_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51lnChgt91L._SX349_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/12/covercut.png http://2025.cipherchallenge.org/wp-content/uploads/2022/12/The-Military-Cipher-of-Commandant-Bazeries-cover-210x300.png http://2025.cipherchallenge.org/wp-content/uploads/2022/12/Manual-for-the-Solution-of-Military-Ciphers-cover-1.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/41qhnn9TMmL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/41-QUaHOHOL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51NwRqw5AJL._SX325_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2020/04/image.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2022/12/Puzzles-for-Spies-GCHQ-cover.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/71EZ3FWKXXL._SX299_BO1204203200_.gif.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51Ecj6kV6BL._SX315_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51SvmSRaJYL._SY376_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/512Pn2i9mlL._SX329_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51QAZiUvPpL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51QMTG31DZL._SX300_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Anthony-Horowtiz-with-his-book-Moonflower-Murders.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-1.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-2.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-3.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-5.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-4.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-6.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2021/09/image-8.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/05/image-6.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/05/image-9.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/05/image-10.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/05/image-11.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/05/image-13.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2020/04/image-1.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/Nightshade-revenge.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/41QtSxqi1sL._SX290_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51pavwXFNL._SX322_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/41I9H-go9EL._SX311_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51m3kvakeQL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/510piTdDdpL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51gKdC6GppL._SX332_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/image-2.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/image-3.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/image-4.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/image-5.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/image-6.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2023/09/image-7.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/61um-IAZxWL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/81dnQVYMQxL._AC_UY436_SEARCH213888_QL65_ML3_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/61rqqOHRlcL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/61UjMNFAAL._SX322_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/61zdnxC1HL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/61yMA71IwXL._SX325_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51yuk2qIIL._SX323_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51fIw2waGL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51ezpwGGQL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51NVo80VxNL._SX323_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51QPfZguxiL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51yHkDKxYL.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/Double-or-Die.png http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51pi3LzaI8L.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51WQwWjkjeL._SX322_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2019/09/51SIBjcrGKL._SX324_BO1204203200_.jpg http://2025.cipherchallenge.org/wp-content/uploads/2022/08/image.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2022/08/image-1.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2022/08/image-2.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2022/08/image-3.jpeg http://2025.cipherchallenge.org/wp-content/uploads/2022/09/The_Sinclairs_Mysteries.png https://2025.cipherchallenge.org/my-account/ 2025-09-30T10:00:27+00:00 https://2025.cipherchallenge.org/cinema/ 2025-10-06T12:04:55+00:00 https://2025.cipherchallenge.org/report-a-problem/ 2025-11-05T12:12:01+00:00 https://2025.cipherchallenge.org/boss-current-case-files/ 2025-12-24T14:24:52+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Frederick-Douglas-explains-his-plan.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Grenville-M.-Dodge.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Casefile-1.2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Casefile-2.1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Casefile-2.2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Casefile-3.1-2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Casefile-3.2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/10/CC2025-Casefile-3.3.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Casefile-4.1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Casefile-4.2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Casefile-4.1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Casefile-4.4.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Casefile-5.1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Substitution-cipher.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/CC2025-Challenge-6B-ioc-chart.png http://2025.cipherchallenge.org/wp-content/uploads/2025/11/image.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/Screenshot-2025-12-02-at-22.53.39.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-7.3.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/CC2025-A-Christmas-Carol-page-21.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-8.1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-8.4.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-8.5-1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-8.6.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Dickens-in-glasses.png http://2025.cipherchallenge.org/wp-content/uploads/2025/09/image-1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Dickens-readings-A-Christmas-Carol.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Look-back-at-24.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-9.5.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-10.1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-10B_2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-10B_3.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-10-4.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-CASEFILE-10.5AA.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-10-5B.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-CASEFILE-10.71A2.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-CASEFILE-10.8DW1.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-CASEFILE-10.921H.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-CASEFILE-10.10KM_H.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Casefile-10.12HAPPYNEWYEAR.png https://2025.cipherchallenge.org/harrys-2025-christmas-miscellany/ 2025-12-24T18:00:07+00:00 http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Harrys-winter-hideout.png http://2025.cipherchallenge.org/wp-content/uploads/2022/09/Harrys-signature-reversed-with-Santa-hat.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-MIscellany-Shedunnit.png http://2025.cipherchallenge.org/wp-content/uploads/2021/09/Grand-Piano.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Miscellany-Poirot.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/Screenshot-2025-12-23-at-13.25.20.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Sapphire-City-1.png http://2025.cipherchallenge.org/wp-content/uploads/2024/09/The-researchers-first-murder-4.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Straight-No-Chaser.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/BOSS-Technicaql-Note-010-cover.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Knowledge-Navigator.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-Diagonality-sudoku.png https://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-King-Williams-College-Quiz-1024x659.png http://2025.cipherchallenge.org/wp-content/uploads/2023/12/Screenshot-2023-12-25-at-11.21.58-1024x920.png http://2025.cipherchallenge.org/wp-content/uploads/2025/12/CC2025-The-Bombe-at-Bletchley.png