crypto trouble

I just finished reading the Cryptography section of the 70-536 book.  While I do understand, conceptually, how all this stuff works, I have to say that I may be in trouble on the test if I really need to memorize the difference between, say, RIPEMD160 and HMACSHA1.  I can’t think of any reasonable mnemonic device that will help me remember that RIPEMD160 is a non-keyed hashing algorithm, and HMACSHA1 is a keyed hashing algorithm.

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