Address XOR based data bus encryption method

Abstract

The invention discloses an address XOR based data bus encryption method. A bus encryption key after XOR is obtained by performing XOR operation on each bit of the bus encryption key with a certain bit or multiple bits of a memory address bus. Cryptograph data is obtained by performing XOR on the bus encryption key after address XOR with memory plaintext data. XOR keys corresponding to plaintext data in each address are different, and thus attackers cannot restore plaintexts easily by reckoning the keys through analyzing the cryptograph data. The method provided by the invention can fend off physical attacks of memory data, effectively improve the system security and also substantially improves the computation speed.

Description

technical field [0001] The invention relates to the field of information encryption, in particular to a data bus encryption method based on address XOR. Background technique [0002] In recent years, physical attacks on smart card memory have attracted more and more attention and research. Sensitive data, such as keys and information related to user privacy, are often stored in the memory of the smart card. Physical attacks against memory use various means to obtain these sensitive information. Physical attack first needs to remove the chip package, and then peel off the chip layer by layer by physical or chemical means. For non-volatile memory (ROM), the data in the memory can be obtained directly through methods such as reverse engineering, image recognition, and coloring. In addition, for all types of memory, including non-volatile memory (ROM) and volatile memory (RAM), an attacker can obtain data transmitted on the bus by probing the bus with a probe. When the data ...

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Problems solved by technology

Another problem is that permutation cannot change the value of the plaintext data, so if the plaintext data happens to be "all 0" or "all 1", then the ciphertext data will be equal to the plaintext data

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