Tag: ChaCha20

Cryptography

Understanding Extended-Nonce Constructions

Post author By Soatok
Post date March 12, 2021
12 Comments on Understanding Extended-Nonce Constructions

How and why XSalsa20/XChaCha were designed, and why they’re secure.

Tags AEAD, AES-GCM, AES-GCM-SIV, ChaCha20, ChaCha20-Poly1305, crypto, cryptography, NMR AEAD, security, Security Guidance, security proofs, stream ciphers, XChaCha20-Poly1305

Cryptography

Designing New Cryptography for Non-Standard Threat Models

Post author By Soatok
Post date September 9, 2020
7 Comments on Designing New Cryptography for Non-Standard Threat Models

Since the IETF’s CFRG decided to recommend OPAQUE as a next-generation Password Authenticated Key Exchange, there has been a lot of buzz in the cryptography community about committing authenticated encryption (known to the more academically inclined as Random Key Robustness), because OPAQUE requires an RKR-secure AE scheme. Random Key Robustness is a property that some […]

Tags BLAKE3, ChaCha20, cryptography, random-key robustness, Security Guidance, symmetric cryptography

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