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== REXX decryption == Has anyone an idea how to implement this:

"Decryption is simply the inverse of encryption, follwing the same steps as above, but reversing the order in which the subkeys are applied."

Reverting the subkeys did not work --Walter Pachl 05:37, 22 July 2017 (UTC) : It works. Above failure was due to an error in my test. --Walter Pachl 11:05, 23 July 2017 (UTC)