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Title:
A Security Analysis of the Composition of ChaCha20 and Poly1305
Authors: Gordon Procter
Abstract:This note contains a security reduction to demonstrate that Langley’s composition of Bernstein’s ChaCha20 and Poly1305, as proposed for use in IETF protocols, is a secure authenticated encryption scheme. The reduction assumes that ChaCha20 is a PRF, that Poly1305 is epsilon-almost-Delta-universal, and that the adversary is nonce respecting.
ePrint: https://eprint.iacr.org/2014/613
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