Diff: explanation.txt

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0:be515c9019e3

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+SHA
+secure hash algorithm
+   - it is deterministic, meaning that the same message always results in the same hash
+   - it is quick to compute the hash value for any given message
+   - it is infeasible to generate a message that yields a given hash value
+   - it is infeasible to find two different messages with the same hash value
+   - a small change to a message should change the hash value so extensively that
+     the new hash value appears uncorrelated with the old hash value (avalanche effect)
+   
+HMAC
+keyed-hash message authentication code or hash-based message authentication code
+   - it is a message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key.
+   - it may be used to simultaneously verify both the data integrity and the authentication of a message
+   - used to sign a message with a symmetrical key
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