Method and system for generating messages including a...

Details Method and system for generating messages including a... Method and system for generating messages including a...

H - Electricity

04

L

H04L 9/28 (2006.01) G07B 17/00 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2327895

A method and system for generating messages from which it can be verified that a variable does not exceed a predetermined limit. The message can be a postal indicium. A message originator, which can be a postage metering system, receives a message in the form R-K(T), where R is a trapdoor function, K is an integer equal to the limit, and T is a plain text, from a data processing center which maintains the inverse function R-1 in secrecy. The message originator computes S m = R m(R-K(T), where m is a current value of the variable, and incorporates S m into the message. A verifier verifies that m < K by confirming that R K-m(S m) = T. The verifier cannot compute R K-m(S m) for m < K since it does not have R- 1. For the same reason the originator cannot compute R-K'(T), k' > K, from R- K(T).

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