Abstract: Verifying and authenticating the identity of participants in electronic communication. A primary key generated from a master key is stored at a sending device and a recipient device. Based on the primary key, the sending device generates a passphrase and an associated secondary key, which includes an encrypted form of data enabling the passphrase to be reconstructed. The secondary key is transmitted to the recipient device, which can reconstruct the passphrase by decrypting the secondary key using the primary key. By reconstructing the passphrase, the secondary key verifies that it has used the correct primary key. The identity of a user of a communication device can be verified and authenticated, as well. The user is issued an authorization key, a copy of which is stored at a remote communication device with respect to the user. Using the authorization code, the user selects specified character positions of the passphrase and enters the resulting input code to the local communication device.

Abstract: Methods and systems for verifying and authenticating the identity of participants in electronic communication. The identity of a recipient communication device, such as a computer, can be verified. A primary key generated from a master key is stored at a sending device and the recipient device. Based on the primary key, the sending device generates a passphrase and an associated secondary key, which includes an encrypted form of the recreation process the passphrase. The secondary key is transmitted to the recipient device, which can reconstruct the passphrase by decrypting the secondary key using the primary key. By reconstructing the passphrase, the secondary key verifies that it has used the correct primary key. The identity of a user of a communication device can be verified and authenticated, as well. The user is issued an authorization key, a copy of which is stored at a remote communication device with respect to the user.