Triple DES encryption

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Triple DES encryption uses a triple-length DATA key comprised of three 8-byte DES keys to encipher eight bytes of data.

To encipher the data it uses the following method:
  • Encipher the data using the first key
  • Decipher the result using the second key
  • Encipher the second result using the third key
The procedure is reversed to decipher data that has been triple-DES enciphered:
  • Decipher the data using the third key
  • Encipher the result using the second key
  • Decipher the second result using the first key

A variation of the triple-DES algorithm supports the use of a double-length DATA key comprised of two 8-byte DATA keys. In this method, the first 8-byte key is reused in the last encipherment step.

Due to export regulations, triple-DES encryption might not be available on your processor.