Which text identifier indicates an MD5-based password scheme in Unix password strings?

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Multiple Choice

Which text identifier indicates an MD5-based password scheme in Unix password strings?

Explanation:
Unix password strings include an algorithm identifier at the start, in the format $id$salt$hash. The id tells you which hashing method was used. MD5-based crypt is indicated by the identifier 1, so a hash beginning with $1$ denotes MD5. The other ids map to different algorithms (for example, 5 for SHA-256 and 6 for SHA-512; bcrypt variants use 2). Therefore, the identifier for MD5-based password schemes is 1.

Unix password strings include an algorithm identifier at the start, in the format $id$salt$hash. The id tells you which hashing method was used. MD5-based crypt is indicated by the identifier 1, so a hash beginning with $1$ denotes MD5. The other ids map to different algorithms (for example, 5 for SHA-256 and 6 for SHA-512; bcrypt variants use 2). Therefore, the identifier for MD5-based password schemes is 1.

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