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Paper 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.

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

Metadata
Available format(s)
PDF
Category
Secret-key cryptography
Publication info
Preprint.
Keywords
stream cipherssecret-key cryptographyrandomized homophonic substitutionhand ciphers
Contact author(s)
curmudgeon @ rudegnu com
History
2016-02-04: last of 12 revisions
2014-04-20: received
See all versions
Short URL
https://ia.cr/2014/257
License
Creative Commons Attribution
CC BY
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