Method for verifying the expected postage security device...

Details Method for verifying the expected postage security device... Method for verifying the expected postage security device...

G - Physics

06

F

G06F 19/00 (2006.01) G07B 17/00 (2006.01) G07B 17/02 (2006.01)

Patent

CA 2221673

A secure and reliable method for verifying in the host system that the expected PSD is coupled to the host system includes generating a random number in the host system and encrypting the random number with a PSD state identification number. The encrypted random number is then sent to the PSD. The PSD decrypts the encrypted random number received using the PSD state identification number and sends the decrypted random number to the host system. The host system compares the decrypted random number received from the PSO to the random number generated in the host system. If they are the same, the host system has verified the expected PSD and has also verified that the PSD has not completed any transactions apart from the host system. A method for verifying that the expected host is coupled to the PSD mirrors the method for verifying the expected PSD.

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