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This is not a standard, it is implementation-specific. It's used by the library which hashes the password to identify which hash function have been used. For example, PHP use this format in its password hashing library: $2y$10$.vGA1O9wmRjrwAVXD98HNOgsNpDczlqm3Jq7KnEd1rVAGv3Fykk1a 2y means that PHP used the bcrypt algorithm. 10 is the cost used to hash ...



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