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Paper 2014/985
Statistical weakness in Spritz against VMPC-R: in search for the RC4 replacement
Bartosz Zoltak
Abstract
We found a statistical weakness in the Spritz algorithm designed by Ronald L. Rivest and Jacob C. N. Schuldt. For N=8: Prob(output(x)=output(x+2)) = 1/N + 0.000498. The bias becomes statistically significant (for N=8) after observing about 2^21.9 outputs. Analogous bias occurs for N=16. We propose an algorithm (VMPC-R) which for N=8 produced 2^46.8 (31 million times more) outputs which remained undistinguishable from random in the same battery of tests. Supported by a series of additional statistical tests and security analyses we present VMPC-R as an algorithm we hope can be considered a worthwhile replacement for RC4.
Metadata
- Available format(s)
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- PRNGCSPRNGSpritzRC4VMPC-Rstream cipherdistinguishing attack
- Contact author(s)
- bzoltak @ vmpcfunction com
- History
- 2014-12-10: received
- Short URL
- https://ia.cr/2014/985
- License
-
CC BY