Granted Patent B2

US 8,635,452 · App. 13/059,262 · Granted Jan 21, 2014

Abstract

Claims (20)

1. A method with resistance to Differential Power Analysis attack for generating a cipher-based message authentication code for a message to be transmitted, comprising:

generating a state array comprised of rows of bytes and columns of bytes based on the message to be transmitted and

computing a cipher-based message authentication code for the message by retaining the bytes of at least one row of the state array and discarding the bytes of the remaining rows of the state array where the remaining rows include at least one row.

2. The method of claim 1 , wherein the state array comprises exactly four rows of bytes and exactly four columns of bytes, exactly four rows of bytes and exactly six rows of bytes, or exactly four rows of bytes and exactly eight rows of bytes.

3. The method of claim 1 , comprising generating the state array according to the Advanced Encryption Standard.

4. The method of claim 1 , comprising computing the cipher-based message authentication code by retaining the bytes of exactly two rows of the state array.

5. The method of claim 1 , wherein the message is a single block message.

6. A secure smartcard system with resistance to Differential Power Analysis attack using a method for generating a cipher-based message authentication code for a message to be transmitted that comprises:

generating a state array comprised of rows of bytes and columns of bytes based on the message to be transmitted; and

computing a cipher-based message authentication code for the message by retaining the bytes of at least one row of the state array and discarding the bytes of the remaining rows of the state array where the remaining rows include at least one row.

7. The system of claim 6 , wherein the state array comprises exactly four rows of bytes and exactly four columns of bytes, exactly four rows of bytes and exactly six rows of bytes, or exactly four rows of bytes and exactly eight rows of bytes.

8. The system of claim 6 , comprising generating the state array according to the Advanced Encryption Standard.

9. The system of claim 6 , comprising computing the cipher-based message authentication code by retaining the bytes of exactly two rows of the state array.

10. The system of claim 6 , wherein the message is a single block message.

11. A method with resistance to Differential Power Analysis attack for computing a cipher-based message authentication code for a message having a plurality of bytes to be transmitted, comprising:

pre-processing the bytes of the message;

generating a state array comprised of rows and columns of bytes based on the message; and

XORing bytes corresponding to one half of the state array with bytes corresponding to the other half of the state array.

12. The method of claim 11 , wherein the message is a single block message.

13. The method of claim 11 , comprising generating the state array according to the Advanced Encryption Standard.

Assignments (10)