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ChaCha is a family of stream ciphers proposed by Daniel J. Bernstein, as an evolution of Salsa20 with (conjecturally) improved resistance to cryptanalysis.
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Understanding ChaCha20-Poly1305 AEAD
In the AEAD scheme described in https://www.rfc-editor.org/rfc/rfc7539#section-2.8.1, the aad and cyphertext are padded to be a multiple of 16 bytes in length. Why is this necessary? Does it provide a …