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Encryption and decryption of a dataset in at least two dimensions

A data set and encrypted technology, which is applied in the field of cryptography, can solve the problems of increased memory read operations, disrupting the timing of the work platform, and difficult memory encryption, etc., to achieve the effect of fast access

Inactive Publication Date: 2010-01-20
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clearly, it is impractical to decrypt a frame store of this size just to obtain a smaller data content for processing
[0005] Another issue that makes memory encryption difficult is that it must not add significant latency to memory reads
Any complex operation during encryption may mess up the timing of the working platform and make the encryption scheme ineffective for the user

Method used

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  • Encryption and decryption of a dataset in at least two dimensions
  • Encryption and decryption of a dataset in at least two dimensions
  • Encryption and decryption of a dataset in at least two dimensions

Examples

Experimental program
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Embodiment Construction

[0052] The illustrations in the illustrations are outlines. It should be noted that in the different drawings, reference signs provided for similar or identical elements differ from the corresponding reference signs only in the first digit.

[0053] The embodiments of the invention described below essentially provide a new form of stream cipher. Therefore, to facilitate understanding of these embodiments, some background information on known stream cipher encryption and stream cipher decryption will first be given.

[0054] Stream ciphers are usually based on linear feedback shift registers and nonlinear Boolean elements. It is designed to be simple and easy to implement in hardware. Assuming a key k and an initialization vector IV, a bit stream is generated from the internal state s of the internal cryptographic registers.

[0055] Here f is the stream cipher update function, and S i is the internal register structure of the stream cipher after encrypting the bit i of the...

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Abstract

It is described a method for encrypting and a method for decrypting at least a portion (155) of a dataset being stored in a memory (150), wherein the dataset has at least two dimensions. The described multi-dimensional cryptographic methods comprise forming a first keystream (165) being assigned to a first dimension of the dataset and forming a second keystream (175) being assigned to a second dimension of the dataset. The encrypting method further comprises encrypting each data packet of the portion (155) of the dataset by using a combination of the first keystream (165) and the second keystream (175). The decrypting method further comprises decrypting each data packet of the portion (155) of the dataset by using a combination of the first keystream (165) and the second keystream (175). It is further described a method for temporarily storing at least a portion (155) of a dataset into a memory (150) and a device for handling a dataset, which method and which device take advantage of the above-described encrypting method and / or the above-described decrypting method.

Description

technical field [0001] The present invention relates to the field of cryptography. In particular, the present invention relates to a method for encrypting at least a portion of a data set stored in a memory, and a method for decrypting at least a portion of a data set stored in a memory, wherein the The data set has at least two dimensions. [0002] Furthermore, the invention relates to a method of temporarily storing at least a part of a data set in a memory, wherein the storage is performed using an encryption method as described above and / or the data is retrieved from the memory using a decryption method as described above The part of the set. Furthermore, the invention relates to a device for processing a data set having at least two dimensions, wherein said part of the data set is transferred from the processing device to the memory by using the encryption method described above, and / or wherein by using A decryption method for transferring the portion of the data set f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/00H04L9/18G06F21/10
CPCH04L9/18H04L9/065G06F21/10G06F2221/2107H04L9/0861G06F21/62G06F21/60H04L63/0428H04L9/0618H04L63/0435G06F2211/007H04L63/0457
Inventor 克劳斯·库尔萨韦蒂莫西·克林斯
Owner NXP BV