A Modified Simple Substitution Cipher With Unbounded Unicity Distance

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Paper 2019/621

A Modified Simple Substitution Cipher With Unbounded Unicity Distance

Bruce Kallick

Abstract

The classic simple substitution cipher is modified by randomly inserting key-defined noise characters into the ciphertext in encryption which are ignored in decryption. Interestingly, this yields a finite-key cipher system with unbounded unicity.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: finite-key unicity randomization
Contact author(s): curmudgeon @ rudegnu com
History: 2019-06-03: received
Short URL: https://ia.cr/2019/621
License: CC BY