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A digital signature method based on rsa algorithm

A technology of RSA algorithm and digital signature, which is applied in key distribution, can solve the problems of low calculation efficiency of software modulo function, etc., and achieve the effect of fast listing and reducing chip cost

Active Publication Date: 2016-01-06
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the modulo operation in step 1, due to the low calculation efficiency of the software modulo function, the hardware Montgomery modulo multiplication calculator is generally used to calculate

Method used

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  • A digital signature method based on rsa algorithm
  • A digital signature method based on rsa algorithm

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Embodiment Construction

[0027] The invention can make the L / 2-bit long modular multiplier calculate the L-bit long RSA private key operation, so as to reduce the chip cost, or use limited resources to meet market changes, and help the rapid development and listing of products. This algorithm can be used when it is necessary to use a small bit length modular multiplier to realize a large bit length RSA private key operation. Specific steps are as follows:

[0028] The following method is used when calculating CmodP:

[0029] 1. Divide C into two parts of equal length, record CH as the high L / 2 part, and CL as the low L / 2 part, so that the L-length C is split into two L / 2-length data, and C=CH<

[0030] 2. Further analysis of CH<

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Abstract

The invention designs an RSA (Ron Rivest, Adi Shamir and Leonard Adleman) algorithm digital signature method which realizes a 1408-bit RSA private key operation technology based on a 1024-bit hardware coprocessor and is mainly applied to the field of safety calculation of smart cards. A parameter in a large-bit-length RSA private key operation is calculated by utilizing a modular multiplier with small bit length, for example, a parameter in 1408-bit or 2048-bit RSA private key operation is calculated by utilizing a modular multiplier of 1024 bits. The RSA private key operation utilizes a Chinese remainder theorem and can be used for reducing the operation length of a main operation-modular exponentiation, but an operation of a key parameter, such as C mod P, C mod Q and a multiply operation, wherein the C represents a plain text, the length of the C is double the lengths of the P and the Q; and the multiply operation is accelerated by utilizing the modular multiplier, and a final result is also over the calculation capability of the modular multiplier. In the technology of the invention, the C is split into two numbers with the small bit lengths to calculate the C mod P by mainly utilizing the algorithm deformation of modular arithmetic; and the multiply operation larger than the length of the modular multiplier is calculated through a quarter multiply operation.

Description

Technical field: [0001] The invention is mainly applied in the field of smart card security calculation. Background technique: [0002] RSA private key operation mainly involves two key technologies: [0003] 1. Use the Montgomery modular multiplication algorithm: [0004] Note the Montgomery modular multiplication as MonMul(a, b, m), then: [0005] MonMul(a, b, m) = a*b*R -1 modm, where the bit length of a, b, m is L, R=2 L , R -1 Meet R -1 *Rmodm=1, mod is a modulo operation. [0006] 2. Use the Chinese remainder theorem for acceleration: [0007] Note that the input data of the RSA private key operation is C, and the RSA private key parameters are p, q, d and n, where the bit length of p and q is L / 2, and the bit length of d and n is L, then the RSA private key The operation Cdmodn can be converted into a modular exponentiation operation on p and q through the definition of Chinese remainder to improve the running speed. The following is a brief description of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/32H04L9/08
Inventor 汪涛范楠迪马宁
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD