AES-NI, symmetric key generation

Werner Koch wk at
Thu Mar 12 13:36:01 CET 2015

On Thu, 12 Mar 2015 11:08, pete at said:

> I (perhaps incorrectly) interpreted the question as "If GnuPG makes
> backwards-incompatible changes in the future, would it be possible for
> one who knows the encryption algorithm used, key, etc. of a message to
> decrypt that message with other, non-GnuPG tools?"

Sure.  As long as the tool understand the OpenPGP protocol.

> For example, if one knows that CAST5-CFB, ZIP, and salted-and-iterated
> S2K was used (as well as the value of the salt and number of
> iterations), might one be able to decrypt the message using OpenSSL
> and other common utilities? I suspect yes, as the encryption and

Yes.  Many years ago there used to be a toolset with reference
implementation based on OpenSSL.  IIRC, it was also available as a
printed book.



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