Patent ID: 9148449
Filing Date: 2015-09-29
Classification: H04L

Abstract:
1. A method of operating a network server to facilitate legal eavesdropping, comprising: receiving, from a first user via a network, (i) a session key (SK) encrypted with a second user's public key, kpubU2, which is the public key of asymmetric private/public key pair kpriU2/kpubU2 of the second user and (ii) the SK encrypted with an escrow server's (ES) public key, kpubES, which is the public key of asymmetric private/public key pair kpriES/kpubES of the ES; storing the received SK encrypted with kpubES; transmitting, to the second user via the network, the received SK encrypted with kpubU2; receiving, from one of the first and the second users via the network, a message encrypted with the SK; storing the received message encrypted with the SK; also transmitting, to the other of the first and the second users via the network, the received message encrypted with the SK; and transmitting to an authorized eavesdropper the stored SK encrypted with kpubES and the stored message encrypted with the SK.