
 Q: What is the recommended key size?
 A: 1024 bit for DSA signatures; even for plain ElGamal
    signatures this is sufficient as the size of the hash
    is probably the weakest link if the keyssize is larger
    than 1024 bits.  Encryption keys may have greater sizes,
    but you should than check the fingerprint of this key.

 Q: Why are some signatures with an ELG-E key valid?
 A: These are ElGamal Key generated by GNUPG in v3 (rfc1991)
    packets.  The OpenPGP draft later changed the algorithm
    identifier for ElGamal keys which are usable for signatures
    and encryption from 16 to 20.  GNUPG now uses 20 when it
    generates new ElGamal keys but still accept 16 (which is
    according to OpenPGP "encryption only") if this key is in
    a v3 packet.  GNUPG is the only program which had used
    these v3 ElGamal keys - so this assumption is quite safe.

 Q: Why is PGP 5.x not able to encrypt messages with my public key.
 A: PGP Inc refuses to accept ElGamal keys of type 20 even for
    encryption.  They only supports type 16 (which are identical
    at least for decryption).  To be better interoperable, GNUPG
    (starting with version 0.3.3) now also uses type 16 for the
    ElGamal subkey which is created if the default key algorithm
    is choosen.  You may add an type 16 ElGamal key to your public
    key which is easy as your key signatures are still valid.

 Q: I can't delete a user id because it is already deleted on my
    public keyring.
 A: Because you can only select from the public key ring, there is
    no direct way to do this.  However it is not so complicated
    do to it anyway:  Create a new user id with exactly the same name,
    you will notice that there are two identical user ids on the
    secret ring now.  Now select this user id and delete it; both
    user ids from the secret ring will be remoed.


