Cryptology ePrint Archive: Report 2014/257

Handycipher: a Low-tech, Randomized, Symmetric-key Cryptosystem

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 by using a nondeterministic encryption procedure, multiple encryption, and randomly generated session keys.

Category / Keywords: secret-key cryptography / stream ciphers, secret-key cryptography, randomized homophonic substitution, hand ciphers

Date: received 10 Apr 2014, last revised 15 Jul 2014

Contact author: curmudgeon at rudegnu com

Available format(s): PDF | BibTeX Citation

Note: A minor change was made in the encryption algorithm resulting in a substantial strengthening of the cipher system.

Version: 20140716:020225 (All versions of this report)

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