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3DES encryption method based on ROM type special secret keys and an integrated circuit thereof

A technology of a private key and an encryption method, which is applied in the field of 3DES encryption based on a ROM-type private key and its integrated circuit, can solve the problems of infeasible business model and high cost of re-streaming, and achieve the effect of reducing the cost of chip development

Inactive Publication Date: 2014-07-16
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for small customers who want unique keys, this business model is not feasible, because the number of chips purchased by small customers is too small, and the cost of redesigning the key and re-spinning is too high

Method used

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  • 3DES encryption method based on ROM type special secret keys and an integrated circuit thereof
  • 3DES encryption method based on ROM type special secret keys and an integrated circuit thereof
  • 3DES encryption method based on ROM type special secret keys and an integrated circuit thereof

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Embodiment

[0042] The ROM module part of the present invention, such as figure 2 As shown, the top of the system design block diagram is the ROM module, and the rest are circuit modules designed according to the 3DES standard algorithm. Such as image 3 As shown, assume that the key length of the case is 64 bits, and the address line of the ROM is 8 bits. In the ROM module shown in the figure, the 8-bit address line can correspond to 256 ROM address units. Before the chip leaves the factory, different binary values ​​are stored in these 256 units, which are used as different keys for backup. That is, the ROM can store 256 A different key, that is, when the chip leaves the factory, these keys have been written in the ROM, and the key stored in the storage unit corresponding to the address output by the decoder can be used for special customers, only the chip designer knows these The value of the key. According to different address lines, the ROM will take the value of the correspondin...

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Abstract

The invention relates to a 3DES encryption method based on ROM type special secret keys and an integrated circuit of the 3DES encryption method. The method includes the steps that firstly, a 3DES chip is provided, and the multiple secret keys are stored in an ROM module inside the chip; secondarily, address wires of the ROM module are arranged; then, according to the arrangement result of the address wires of the ROM module, the secret keys of corresponding storage units in the ROM module are read, and a 3DES encryption algorithm is performed on the secret keys to finish 3DES encryption. According to the method and the integrated circuit, mass production of the chip can be achieved, the encrypted chip can be sold to different customers, the secret keys of part of customers are customized and unique, other customers do not know the secret keys, due to the procedures, chip selling flexibility can be significantly improved, and design cost of the chip can be reduced.

Description

technical field [0001] The invention relates to a 3DES encryption method based on a ROM-type private key and an integrated circuit thereof. Background technique [0002] The 3DES encryption algorithm is an encryption algorithm designed with DES as the basic module and through the method of combining groups. It uses 3 keys to perform DES encryption on the data block 3 times, where the second DES runs in decryption mode. [0003] The DES algorithm is a typical iterative block cipher algorithm, such as figure 1 As shown, first perform initial permutation (IP) on the 64-bit plaintext, group it into equal left and right parts (32 bits each), and then perform 16 rounds of identical function operations (called f-function operations), In each round, a 48-bit subkey generated by the initial key is used. After 16 rounds of operations, the left and right parts are exchanged together and the inverse operation of the initial replacement (IP-1) is performed to obtain the encrypted resul...

Claims

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Application Information

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IPC IPC(8): H04L9/06
Inventor 陈传东陈志阳樊明辉施隆照赖松林
Owner FUZHOU UNIVERSITY
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