A Modified Simple Substitution Cipher With Unbounded Unicity Distance

Bruce Kallick

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

BibTeX

@misc{cryptoeprint:2019/621,
      author = {Bruce Kallick},
      title = {A Modified Simple Substitution Cipher With Unbounded Unicity Distance},
      howpublished = {Cryptology {ePrint} Archive, Paper 2019/621},
      year = {2019},
      url = {https://eprint.iacr.org/2019/621}
}