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Device and method for implementing AES encryption and decryption

An encryption and decryption technology to be encrypted, applied in the field of encryption and decryption, it can solve the problems of inability to realize resource sharing and huge hardware overhead, and achieve the effect of reducing scale and saving hardware resources.

Inactive Publication Date: 2011-04-27
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, for 128-bit AES encryption and decryption, the 128-bit data has a total of 16 bytes. When performing a transformation, both encryption and decryption need to use 16 substitution tables. In addition, 4 more tables are needed in the round key expansion part. A replacement table, so a total of 36 tables are needed, each table stores a total of 256 bytes, and a total of 9KB of space is required to store these tables, which is a huge hardware overhead
And because the encrypted lookup table is different from the decrypted lookup table, resource sharing cannot be achieved

Method used

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  • Device and method for implementing AES encryption and decryption
  • Device and method for implementing AES encryption and decryption
  • Device and method for implementing AES encryption and decryption

Examples

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Embodiment Construction

[0027] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] The Rijndael algorithm is a block encryption algorithm with variable block length and variable key length. The block length and key length can be independently set to any integer multiple of 32 bits, and the minimum value is 128 bits. The maximum value is 256 bits, that is, both the data length and the key length can be 128 bits, 192 bits and 256 bits.

[0029] AES is actually a special case of Rijndael. In its specification standard, it is clearly defined that the data packet length is fixed at 128 bits, and the key length can be 128 bits, 192 bits or 256 bits, which are called "AES-128", " AES-192" and "AES-256". The present invention is described by taking "AES-128" as an example.

[0030] The input and output of AES can be regarded as a one-dimensional array in bytes. The intermediate value obtained by data processing in the pro...

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Abstract

The invention provides a device and a method for implementing AES (advanced encryption standard) encryption and decryption. The method comprises the following steps of: receiving data to be encrypted or decrypted, and copying the data to be encrypted or decrypted into a state matrix; adding the state matrix and an initial key; performing Nr-1 round transformation on the state matrix added with the initial key; and performing incomplete round transformation on the state matrix subjected to Nr-1 round transformation so as to complete the encryption or decryption processing, wherein Nr is the round number required by encryption and decryption. The invention provides a device and a method for implementing AES encryption and AES decryption; meanwhile, the circuit scale can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of encryption and decryption, and in particular relates to a device and a method for realizing an AES (Advanced Encryption Standard, Advanced Encryption Standard) encryption and decryption algorithm. Background technique [0002] With the rapid development of network technology, communication technology and multimedia technology, information technology represented by the Internet and mobile communication has completely penetrated into people's daily life. The ensuing information security problem has become an urgent problem that people need to solve. Information security needs to rely on security mechanisms, and security mechanisms mainly rely on cryptography, which is the core technology of information security. The use of safe and efficient encryption algorithms is the key to ensuring information security, so the research on encryption algorithms and their implementation has strong practical significance....

Claims

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Application Information

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IPC IPC(8): H04L9/06
CPCH04L9/0681H04L2209/122H04L9/0631
Inventor 范艳芳赵博生
Owner ZTE CORP
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