[quote:e7de579fb0][i:e7de579fb0]Originally posted by picasso[/i:e7de579fb0]
The later version of PGP is compatible with GPG too.
In fact gpg and PGP are two different protocols.[/quote:e7de579fb0]
if you want to encrypt a message with GnuPG so that PGP is able to decrypt it:
It depends on the PGP version.
• PGP 2.x
You can't do that because PGP 2.x normally uses IDEA which is not supported by GnuPG as it is patented (see 3.3), but if you have a modified version of PGP you can try this:
• gpg --rfc1991 --cipher-algo 3des ...
Please don't pipe the data to encrypt to gpg but provide it using a filename; otherwise, PGP 2 will not be able to handle it.
As for conventional encryption, you can't do this for PGP 2.
• PGP 5.x and higher
You need to provide two additional options:
• --compress-algo 1 --cipher-algo cast5
You may also use &3des& instead of &cast5&, and &blowfish& does not work with all versions of PGP 5. You may also want to put:
compress-algo 1
into your ~/.gnupg/options file - this does not affect normal GnuPG operation.
This applies to conventional encryption as well.
Also you are right GnuPG is compatible with PGP, or better to say that GnuPG is a GNU replacement (free) for PGP.
