A cryptographic device having reduced vulnerability to...

Details A cryptographic device having reduced vulnerability to... A cryptographic device having reduced vulnerability to...

H - Electricity

04

L

H04L 9/28 (2006.01) H04L 9/30 (2006.01)

Patent

CA 2325113

A cryptographic device and method of operation for encrypting messages. The device can be incorporated into a postage metering system to provide cryptographically secured postal indicia. The device and method provide increased security against side-channel attacks such as differential power analysis (DPA). An encryption key is transformed with a first function to generate a temporary key as a function of a random number. A message is encrypted with the temporary key to generate a modified message. The modified message is transformed with a second function to generate an encryption. The encryption generated is identical to a direct encryption of the message with the untransformed key. The temporary key is changed frequently to protect against side-channel attacks.

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