Multimedia encryption and decryption method based on combination cell automatic machine

An encryption method and automaton technology, applied in the field of decryption, can solve the problems of insufficient security and insufficient multimedia data encryption, and achieve good results.

Inactive Publication Date: 2017-09-26
SUN YAT SEN UNIV
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  • Abstract
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Problems solved by technology

[0003] In order to solve the problem that the multimedia data encryption in the prior art is not perfect enough and not safe enough, the present invention prov

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  • Multimedia encryption and decryption method based on combination cell automatic machine
  • Multimedia encryption and decryption method based on combination cell automatic machine
  • Multimedia encryption and decryption method based on combination cell automatic machine

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0047]The present invention is realized based on the combined cellular automaton, and the used combined cellular machine is first described. A cellular automaton is composed of an array of cellular units, which can be one-dimensional or multi-dimensional. In the array, each cell is in a certain state, and at the next moment, the value of each cell is determined by the corresponding function rules and the state of the neighborhood at each moment. Cellular automaton is a kind of finite automaton, which has dynamic characteristics and is discrete in time, space and state. Its rules are simple and easy to implement. It is precisely because of these excellent characteristics that cellular automata are very suitable for encryption.

[0048] Cells of cellular automata can also be called units or cells, which are the basic units of cellular automata...

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Abstract

The present invention provides a multimedia encryption and decryption method based on a combination cell automatic machine, belonging to the multimedia encryption field. The encryption method comprises the following steps: a pseudo-random number generator generates two random sequences; a data preprocessing step is performed; a reversible cell automatic machine step is performed; and a cell automatic machine evolution step and a determination step are performed: it is determined whether the encrypted cryptograph accords with an avalanche effect or not, if the encrypted cryptograph does not accord with the avalanche effect, the cell automatic machine is employed for going on evolution, and if the encrypted cryptograph accords with the avalanche effect, the evolution is stopped to obtain the cryptograph of a plaintext. The present invention further provides a decryption method corresponding to the multimedia encryption method. The cell automatic machine is employed to perform multimedia encryption, the multimedia encryption and decryption method based on the combination cell automatic machine are simple and easy to programme, can perform association of the plaintext data and the encryption key, are higher in safety, and can effectively improve the safety of the encryption algorithm and the encryption efficiency.

Description

technical field [0001] The invention relates to the field of multimedia encryption, in particular to a multimedia encryption method based on combined cellular automata, and also to a decryption method corresponding to the multimedia encryption method. Background technique [0002] In recent years, with the rapid development of computer network and technology, all walks of life have begun to use more computer technology, including the information industry. People's communication methods are becoming more and more diverse and convenient. "Information" no longer just means simple text communication. Nowadays, pictures, audio, video, etc. are also commonly used communication methods. These multimedia information has penetrated into our daily life. However, while communication becomes convenient, multimedia information is easily leaked due to the openness of network transmission. For some important multimedia data, we need to ensure its security during transmission, so as not t...

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Application Information

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IPC IPC(8): H04L9/08G06T9/00
CPCH04L9/0869G06T9/00
Inventor 彭安基
Owner SUN YAT SEN UNIV
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