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Method and device for improving digital encryption standard resisting differential power analysis

A differential power consumption analysis and encryption standard technology, applied to encryption devices with shift registers/memory, etc., can solve problems such as the inability to effectively eliminate real keys and power consumption correlations, and improve resistance to differential power consumption analysis attacks The ability to prevent information leakage and the effect of being attacked

Inactive Publication Date: 2013-03-20
DATANG MICROELECTRONICS TECH CO LTD
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  • Description
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a digital encryption standard improvement method and device to solve the problem that the real key and power consumption correlation cannot be effectively eliminated in the prior art

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  • Method and device for improving digital encryption standard resisting differential power analysis
  • Method and device for improving digital encryption standard resisting differential power analysis
  • Method and device for improving digital encryption standard resisting differential power analysis

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Embodiment Construction

[0042] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0043] There are no effective defense techniques in the original DES implementation that allow attackers to easily align and process the collected power consumption curves. The present invention does not adopt the method of adding randomized noise and power consumption balancing devices, because the first method has many ways to remove these noises in actual attacks, even if a noise source with good random performance can be designed, if the attacker The attack method using electromagnetic analysis can still bypass the influence of noise; the second method is very difficult t...

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Abstract

The invention discloses a method and a device for improving a digital encryption standard resisting differential power analysis. In an S-box function processing step of standard 16-time operation for digital encrypting a 64-bit plaintext, a new S-box function represented by SM-Box is set in the following way. According to the invention, through the adoption of the S-box function transformed by different random numbers, relevance between real key information and a power curve is destroyed and great difficulty is caused in information obtaining of power analysis so as to achieve a purpose of resisting the power analysis. According to the invention, by using a covering technology, the plaintext is pre-covered before encryption operation and the random numbers are covered in each operation, so that attack caused by information leakage is effectively prevented, and the capacity of resisting differential power analysis attack is enhanced.

Description

technical field [0001] The present invention relates to the technical field of symmetric encryption and decryption algorithms, in particular to an improved method and device for a digital encryption standard (Data Encryption Standard, DES for short) resistant to differential power analysis. Background technique [0002] With the continuous development of smart card technology, the security of smart card chips is also facing more and more challenges. Among many encryption algorithms, the DES algorithm is a widely used symmetric encryption / decryption algorithm. [0003] In the actual use of the cryptographic system, its hardware will inevitably leak some information during operation, such as power consumption, running time, electromagnetic waves, etc. Using the above information to attack the cryptographic system has become a huge threat to information security chip products. Among many side-channel attack methods, Simple Power Analysis (SPA) and Differential Power Analysis (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06
Inventor 田圆顾申高洪福
Owner DATANG MICROELECTRONICS TECH CO LTD
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