The -1 in SHA-1 isn't because it was first. It was meant to be just "SHA", but NSA discovered a flaw in their own standardized hash algorithm soon after they pu

The -1 in SHA-1 isn't because it was first. It was meant to be just "SHA", but NSA discovered a flaw in their own standardized hash algorithm soon after they published it and issued SHA-1 as a fixed version.