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Level II Challenges (162)
Page 1 of the challenges in Level II, ordered by date posted (the most recent appear first).
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Extended Handycipher is an enhancement of the newly designed cipher Handycipher, which permits pen-and-paper encrypting and decrypting, while providing a significantly high level of security. From the 815-character plaintext the first 229 characters are known. Read more...
Click here to get to the corresponding forum topic to share your opinion. Click here to download the challenge. Click here to download the additional file of the challenge. |
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