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Paper 2017/1163
MILP-aided Cryptanalysis of Round Reduced ChaCha
Najwa Aaraj and Florian Caullery and Marc Manzano
Abstract
The inclusion of ChaCha20 and Poly1305 into the list of supported ciphers in TLS 1.3 necessitates a security evaluation of those ciphers with all the state-of-the-art tools and innovative cryptanalysis methodologies. Mixed Integer Linear Programming (MILP) has been successfully applied to find more accurate characteristics of several ciphers such as SIMON and SPECK. In our research, we use MILP-aided cryptanalysis to search for differential characteristics, linear approximations and integral properties of ChaCha. We are able to find differential trails up to 2 rounds and linear trails up to 1 round. However, no integral distinguisher has been found, even for 1 round.
Metadata
- Available format(s)
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. NISK 2017
- Keywords
- cryptanalysisstream ciphersARX
- Contact author(s)
- manzanomarc @ gmail com
- History
- 2017-11-30: received
- Short URL
- https://ia.cr/2017/1163
- License
-
CC BY