Printing postage with cryptographic clocking security

摘要

PCT No. PCT/US97/14571 Sec. 371 Date Apr. 20, 1998 Sec. 102(e) Date Apr. 20, 1998 PCT Filed Aug. 20, 1997 PCT Pub. No. WO98/08325 PCT Pub. Date Feb. 26, 1998Secure activities are carried out between a client (23) and a server (21) in connection with the printing of postage. A cryptographically secure exchange (22) is employed so as to establish a common time base (24, 25), said common time base obviating a constant (e.g. battery) power supply. The postage-printing client (23) thus does need not have a reliable power supply in the absence of AC (mains) power.