Challenge "Extended Handycipher — Part 1" ¶
By: admin on March 27, 2015, 3:26 p.m.
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.
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