[Gpg4win-users-en] GPG 2 and Idea

Werner Koch wk at gnupg.org
Thu Jul 1 13:05:28 CEST 2010

Matthias Pannek <matthias at pannek.de> writes:

> is there a way to use Idea with GnuPG 2.x?

If you mean this old 64 bit blocksize encryption algorithm as used by
PGP 2: No, there is no way to do this.

IDEA is an obsolete algorithm.  The only use pattern for this is to
re-encrypt messages once encrypted with PGP 2: Use PGP 2 to decrypt and
encrypt it again with GPG.

Modern algorithms feature a 128 bit blocksize and are far better
cryptanalyzed than the patended IDEA algorithm



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