Privacy and security
Fax

The objectives are to ensure :

• document integrity (to prevent modification by third parties) ;

• a high level of confidentiality for documents (preventing them from being read by a third party);

• the identity of the sending and receiving entities.

Appendix H to Recommendation T.30 provides for a registration mode that enables correspondents to authenticate themselves by exchanging their public key.

Registration is a two-step process:

• the sending and receiving terminals hash their identity and public key. The resulting "fingerprint" is exchanged without any fax transmission: it's an out-of-band exchange. The public key is sent to the recipient by e-mail, telephone or post;

• Sending and receiving terminals exchange their identities and public keys using the T.30 protocol....