Cryptology ePrint Archive: Report 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.

Category / Keywords: secret-key cryptography / finite-key, unicity, randomization

Date: received 1 Jun 2019

Contact author: curmudgeon at rudegnu com

Available format(s): PDF | BibTeX Citation

Version: 20190603:070928 (All versions of this report)

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