发明名称 |
Cryptographic device having reduced vulnerability to side-channel attack and method of operating same |
摘要 |
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 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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申请公布号 |
US6724894(B1) |
申请公布日期 |
2004.04.20 |
申请号 |
US19990434454 |
申请日期 |
1999.11.05 |
申请人 |
PITNEY BOWES INC. |
发明人 |
SINGER ARI P. |
分类号 |
H04L9/30;(IPC1-7):H04K1/00;H04L9/28 |
主分类号 |
H04L9/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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