6533b827fe1ef96bd12871a0

RESEARCH PRODUCT

A Note on Keys and Keystreams of Chacha20 for Multi-key Channels

Adam CzubakMarcin SzymanekAndrzej Jasiński

subject

Cybersecuritybusiness.industryComputer scienceKeystreamBoundary (topology)Stream cipher020206 networking & telecommunications02 engineering and technologyRC4Symmetric-key algorithmChacha200202 electrical engineering electronic engineering information engineering020201 artificial intelligence & image processingHardware_ARITHMETICANDLOGICSTRUCTURESbusinessSymmetric encryptionStream cipherAlgorithm

description

In this paper we analyze the keystreams generated by the Chacha20 stream cipher. We also compare these to the ones generated by its predecessor, the RC4 stream cipher. Due to the proposed multi-key channels in the upcoming TLS 1.3 standard we analyze the behavior of the keystream in the boundary case where there is a single bit difference between two keys used for the initiation of the stream cipher algorithms. The goal is to check whether a single bit change in the key has any predictable influence on the bits of the keystream output.

yearjournalcountryeditionlanguage
2018-01-01
https://doi.org/10.1007/978-3-319-92459-5_29