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November 13, 2007

Hashing: Can I go backwards to restore the original data?

After I hash a string with "SHA512″ and encoding-mode "base64″, how to convert it again back to the original string?

You cannot. Hash algorithms are one-way algorithms that create "fingerprint" of the data. Regardless of the amount of data that is hashed, the output (i.e. the fingerprint) is always a constant size. For example, SHA-1 output is always 20 bytes. SHA-512 output is always 64 bytes. Digest-MD5 has a 16-byte output.

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