On Jun 22, 2010, at 10:09 PM, Dan Mahoney, System Admin wrote:

> The FAQ for IDEA states that "The official GnuPG distribution does not 
> contain IDEA due to a patent restriction. The patent does not expire before 
> 2007 so don't expect official support before then."
> 
> (http://gnupg.org/documentation/faqs.en.html#q3.3)
> 
> Is this very old and it's now supported?  Or is it still not in for some 
> other reason (either oversight, legal, or other).

I'm not sure about the 2007 patent expiration - I recall it being right around 
now, actually (2010-2011).

In any event, it's mostly not supported.  IDEA in OpenPGP is a funny thing - it 
sort of missed its useful window because of the patent stuff.  PGP 2.x used it, 
but when things went to OpenPGP, 3DES was used instead, and IDEA was downgraded 
to a SHOULD implement in the first OpenPGP spec, and then downgraded further to 
a MAY implement in the revised spec.

Time moved on, and better ciphers became available, so these days even though 
the patent is expiring, there isn't really a use for IDEA outside of 
interoperating with users of PGP 2.x.  I'd be surprised to see much PGP 2.x 
usage these days.  OpenPGP even explicitly rejects making new PGP 2.x-style 
keys.

David


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