Paper 2017/589
An Attempt to Cryptanalyze A Partially Known Cipher Algorithm
Juay Guan Hee
Abstract
This paper presents an empirical crypt-analytical method to analyse a partially known cipher algorithm. During cipher evaluation, it is always a challenge to make any decision on the strength of a partially known cipher algorithm, and if the algorithm is suitable for deployment. The core concept will be presented first, followed by an example to illustrate the idea. The idea is to focus on one input bit at a time using a known keystream attack, assuming this bit is independent from the rest. By computing the statistics of related keystream bits and using the correlation method, one can derive this input bit with certain confidence.
Note: Please note that this is NOT a randomness test. This is a proven concept tested using simulation, as well as using double blind method. With this method, one can analyze a particular type of cipher with the linear complexity instead of exponential complexity.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- Linear Feedback Shift RegisterCorrelation CoefficientStream Cipher.
- Contact author(s)
- hjuaygua @ gmail com
- History
- 2017-06-20: received
- Short URL
- https://ia.cr/2017/589
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2017/589,
author = {Juay Guan Hee},
title = {An Attempt to Cryptanalyze A Partially Known Cipher Algorithm},
howpublished = {Cryptology {ePrint} Archive, Paper 2017/589},
year = {2017},
url = {https://eprint.iacr.org/2017/589}
}
