Re: gnugpg question

[al <alias24 () HotPOP com>]

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On Fri, 18 Oct 2002 12:07:35 -0700, Evil Monkey wrote:

> - I can create a keypair with gnugpg on the slackware box.  I can use this
> key pair to successfully encrypt and decrypt things on that box.  I can
> export the key pair and import it into the pgp tools on a windows box.
> However when I try to encrypt or decrypt with that keypair it barfs on the
> passphrase.  With an older version of the pgp tools it claimed the
> passphrase was incorrect.  With the most current version it claims the
> passphrase doesn't exist and won't let me do a thing.  On the newest version
> of pgp tools, if I check out the key's properties and attempt to change the
> passphrase it says the passphrase I've entered is incorrect.
>
> Any ideas as to the cause of this?

Keys created with new versions of GPG have MDC (Modification Detection Code)
protection. (see http://www.counterpane.com/pgp-attack.html for more).

To export your secret key so it is compatible with PGP, do this from gpg:

    gpg --simple-sk-checksum --edit keyid
    passwd
    enter password
    change password (SAME PASSWORD is fine)
    save

    gpg --export-secret-key keyid > secret_key_filename.asc
    gpg --export keyid > public_key_filename.asc

The reverse is valid too. To have a PGPkey MDC protected in GPG keyring,
after importing the secret PGPkey into GPG, from gpg do:

    gpg --edit keyid
    passwd
    enter password
    change password (SAME PASSWORD is fine)
    save

HTH,
- -- 
al <alias24 () HotPOP com>

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