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Security Fundamentals & Crypto · Advanced

Argon2

Memory-hard password hashing function that won the 2015 Password Hashing Competition; Argon2id is recommended.

Definition

Argon2 comes in Argon2d, Argon2i, and the hybrid Argon2id, standardized in RFC 9106. It is tunable for memory, iterations, and parallelism. OWASP recommends Argon2id as the first choice for password storage.

Example

OWASP's minimum Argon2id configuration is 19 MiB of memory, 2 iterations, and 1 degree of parallelism.

Exam tip

Argon2id is the modern best answer for password storage.

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