Welcome to the resource topic for 2014/257
Title:
Handycipher: a Low-tech, Randomized, Symmetric-key Cryptosystem
Authors: Bruce Kallick
Abstract:Handycipher is a low-tech, randomized, symmetric-key, stream cipher, simple enough to permit pen-and-paper encrypting and decrypting of messages, while providing a significantly high level of security. It combines a simple 31-character substitution cipher with a 3,045-token nondeterministic homophonic substitution cipher, and employs the insertion of randomly chosen decoy characters at random locations in the ciphertext. A deniable encryption scheme based on the cipher is described, as well as a way of extending the cipher by using randomly generated session keys.
ePrint: https://eprint.iacr.org/2014/257
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