Method, device and system for multi-level encryption and decryption
An encryption method and technology of an encryption device are applied in the direction of analog security/charging system, broadcasting device, transmission system, etc., which can solve the problems of IP network transmission error, transmission byte error, disordered order, etc., and achieve low latency and high performance. The effect of transmission bandwidth and data transmission security
Inactive Publication Date: 2010-01-06
VIMICRO CORP
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Problems solved by technology
[0005] (2) Complexity
[0008] There are a large number of transmission errors in the IP network. Congestion, buffer overflow and various network errors may cause packet loss, and various sudden errors may also cause transmission byte errors.
[0009]The existing technology uses replacement encryption to divide the data into blocks and scramble the order. Only by recovering the scrambled data according to the method agreed by the communication parties can the correct plaintext be obtained , the replacement method generally does not change the statistical characteristics of the video or image, and is not suitable for highly confidential applications that require a higher security level
Method used
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[0050] In order to make the purpose of the present invention more clear, it will now be described in conjunction with the accompanying drawings and specific embodiments. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0051] figure 1 It is a flowchart of a multi-level encryption method in an embodiment of the present invention;
[0052] Such as figure 1 As shown, the multi-level encryption method is implemented through the following steps:
[0053] S101, dividing the received PDU into equal-length data blocks;
[0054] Wherein, the equal-length data block length is 1288 bytes, of course, according to the length of the existing data block 1288 bytes can be further divided, therefore, the changes based on and not departing from the idea of the present invention should be covered by the protection scope of the present invention.
[0055] S102....
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The invention provides a method, a device and a system for multi-level encryption and decryption. The method comprises the following steps of: dividing a received protocol data unit into data blocks with equal lengths; primarily encrypting a audio basic code stream and / or a video basic code stream in the divided data blocks; converting the encrypted audio basic code stream and / or video basic code stream into a transmission code stream; and secondarily encrypting the transmission code stream obtained by conversion. Due to the adoption of the multi-level encryption, the data transmission is safer; and by dividing the protocol data unit into the data blocks with equal lengths, lower time delay and stronger fault tolerant ability are achieved in the data transmission, and high transmission band width is provided at the same time.
Description
technical field [0001] The present invention relates to the technical field of encryption and decryption, in particular to a multi-level encryption and decryption method, device and system. technical background [0002] In an IP network environment, there are usually the following requirements for cryptographic algorithms: [0003] (1) Security [0004] Security is a core requirement of cryptographic methods. On the one hand, the encryption scheme should be able to provide sufficient protection for the content; on the other hand, considering commercial applications, the cost of security should be controlled within a reasonable range. Compared with traditional data, audio and video information has a large amount of data, and there is a large redundancy among the data, which requires higher security. [0005] (2) Complexity [0006] Streaming media applications require mobile terminal devices to be able to decrypt content in real time, but the computing and processing capa...
Claims
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Login to View More IPC IPC(8): H04L9/18H04L29/06H04H60/82H04N7/16
Inventor 陈羚
Owner VIMICRO CORP