MD5, sha-1 and sha-2

md5 or sha1 creates 128 bit hash value of the original value. The original value cannot be obtained from a hash value. This is the best way to store a representation of passwords. These older hashing algorithms have weakness though.

The SHA-2 family of hashing algorithms is latest and most secure methods to hash data. Can create up to 512 bit hash value. The government will be using SHA-2. SHA-3 algorithms.

The SHA-2 family: SHA-224, SHA-256, SHA-384, SHA-512

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