I am currently using http://www.myfax.com/
to send and receive faxes at work.
I need the faxes to be encrypted. They offer public key encryption with PGP 9.8.2
They just need my public key to be compatible with their PGP version.
I found a few statements at the GPG site, which may not be true for newer versions of gpg:
- PGP, Inc. refuses to accept Elgamal keys of type 20 even for encryption.They only support type 16.
- PGP 5.x does not accept v4 signatures for data material but OpenPGP requests generation of v4 signatures for all kind of data, that's why GnuPG defaults to them.
- By default, GnuPG encrypts your secret key using the Blowfish symmetric algorithm. Older PGPs will only understand 3DES, CAST5, or IDEA symmetric algorithms.
- PGP doesn't do Elgamal signing keys at all, so they are not usable with any version.
Since this is a work related task, I attempt to avoid using trial and error here, because an incompatible key may provoke loss of crucial information. It is difficult to estimate how long it would take them/me to find out that the key provided was not compatible; but probably it would entail a significant loss for the business.
I would appreciate some pointers as to how to generate a PGP compatible key with gpg.
Thanks for reading this.