Attack test method and device

Abstract

The invention provides a collision attack test method and a device. The invention provides the collision attack test method aiming to solve chosen-plaintext attack of a key in an encryption algorithm of the prior art. The method comprises the following steps: receiving a plaintext; storing at least one part of the plaintext; judging whether the analogical number of the stored at least one part of the plaintext and other stored at least one part of the plaintext is more than or equal to a first threshold value; outputting a signal with an attack mode in the current plaintext if the analogical number is more thanor equal to the first threshold value, otherwise, outputting a normal signal; and repeating the steps before the next plaintext comes. The method and the device have the advantages that the method and the device can test the inputting plaintext with obvious attack mode and avoid the chosen-plaintext attack on the key.

Description

technical field [0001] The invention relates to the field of security detection, in particular to the field of security detection of smart cards, and specifically relates to a collision attack detection method and device. Background technique [0002] In an encryption algorithm, a key is used to encrypt plaintext into ciphertext. Here, the term encryption algorithm is to be understood as an algorithm for calculating an identification code with respect to plaintext. Such an algorithm is also called a hash function with a key (cryptographic hash function). Here, the identification code of the plaintext is calculated from the plaintext using the key. In general, contrary to true encryption algorithms in the narrower sense, such functions cannot be reversed, ie decryption can no longer be performed. [0003] An encryption algorithm is used, for example, to authenticate a first instance against a second instance. To this end, for example, the first instance encrypts the plain...

AI Technical Summary

Problems solved by technology

[0014] Another object of the present invention is to provide a collision attack detection device, which is used to solve the lack of protection for the encryption algorithm in the prior art. The input data is analyzed, and if it meets the requirements, the encryption operation can be performed; otherwise, the attack data is directly discarded.

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