We redesigned MysteryTwister, enjoy! Feedback

 Explore Challenges

Extended Handycipher — Part 2 Level 2

by Bruce Kallick, published on 3/27/2015

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 905-character plaintext 229 characters somewhere in it are known.