This brief introduction to the contents of BASE64, MD5, SHA, HMAC several encryption algorithms. BASE64 encoding algorithm is not a real encryption algorithm. MD5, SHA, HMAC three encryption algorithms can be described as non-reversible encryption and decryption of the encryption method is not, we call one-way encryption algorithm. We usually put them as the basis for encryption. These three simple encryption is not reliable.

BASE64Java.doc

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