CODING DEVICE AND METHOD WITH RECONFIGURABLE AND SCALABLE ENCRYPTION/DECRYPTION MODULES

• US 20100278338A1
• Filed: 05/04/2009
• Published: 11/04/2010
• Est. Priority Date: 05/04/2009
• Status: Abandoned Application

• Current Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Original Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Inventors: Chang, Yu-Lin, Zhou, Wensheng
• Application Number:
  US12/435,349
• Publication Number:
  US 20100278338A1
• Time in Patent Office: Days
• US Class Current: 380/200
• CPC Class Codes: G09C 1/00 Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system cryptographic typewriters G09C3/00
• CPC Class Codes: H04L 2209/12 Details relating to cryptographic hardware or logic circuitry
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/0662 with particular pseudorandom sequence generator
• CPC Class Codes: H04L 9/16 the keys or algorithms being changed during operation

Abstract

A reconfigurable and scalable cryptography (encryption/decryption) system architecture and related method are described. The system utilizes a multiple-pass approach, each pass applying one cryptography algorithm with its own cryptography keys. The encrypted data can only be fully and correctly decrypted with the correct algorithms in the correct sequence (as determined by one or more security level parameters) and the correct cryptography keys. The system includes a multiple cryptography algorithm set section which is reconfigurable to perform multiple cryptography algorithms sequentially, and a cryptography controller which receives an input key set and a security level parameter. The cryptography controller reconfigures the multiple cryptography algorithm set section based on the security level parameter to perform multiple selected cryptography algorithms in a selected sequence. The cryptography controller also generates cryptography keys based on the input key set and provide the cryptography keys to the multiple cryptography algorithm set section.

Claims

1. A cryptography system comprising:

a multiple cryptography algorithm set section reconfigurable to perform a plurality of cryptography algorithms sequentially on input data; and

a cryptography controller receiving an input key set and one or more security level parameters, the cryptography controller reconfiguring the multiple cryptography algorithm set section based on the security level parameters to perform a plurality of selected cryptography algorithms in a selected sequence, the cryptography controller further generating one or more cryptography keys based on the input key set and providing the cryptography keys to the multiple cryptography algorithm set section for performing the selected cryptography algorithms.

2. The cryptography system of claim 1, wherein the cryptography algorithms are encryption algorithms, the cryptography system further comprising:

a redundancy removal section for performing spatial and/or temporal redundancy removal on input video data; and

an entropy encoding section for performing entropy encoding on video data outputted by the redundancy removal section,

wherein the multiple cryptography algorithm set section performs the encryption algorithms on video data outputted by the entropy encoding section.

3. The cryptography system of claim 1, wherein the cryptography algorithms are decryption algorithms, the cryptography system further comprising:

an entropy decoding section for performing entropy decoding on video data outputted by the multiple cryptography algorithm set section; and

a redundancy recovery section for performing spatial and/or temporal redundancy recovery on video data outputted by the entropy decoding section.

4. The cryptography system of claim 1, wherein the multiple cryptography algorithm set section comprises one or more cryptography units, each cryptography unit implementing one or more cryptography algorithms and being reconfigurable to perform any one of the one or more cryptography algorithms.

5. The cryptography system of claim 1, wherein the multiple cryptography algorithm set section comprises a plurality of cryptography units connected in a pipeline, each cryptography unit implementing one or more cryptography algorithms and being reconfigurable to perform any one of the one or more cryptography algorithms, and

wherein the cryptography controller reconfigures each cryptography unit to perform one of the selected cryptography algorithms or to perform no algorithm.

6. The cryptography system of claim 1, wherein the multiple cryptography algorithm set section comprises:

a cryptography unit implementing a plurality of cryptography algorithms and reconfigurable to perform any one of the plurality of cryptography algorithms; and

a first and a second multiplexer connected before and after the cryptography unit, respectively,

wherein the cryptography controller reconfigures the cryptography unit to perform the selected cryptography algorithms in the selected sequence one at a time forming multiple processing stages, and controls the first and second multiplexers to feed output of one stage back to the cryptography unit for a next stage.

7. The cryptography system of claim 1, wherein the cryptography controller uses a programmable algorithm to generate the cryptography keys and is programmable to require different numbers of input keys in the input key set.

8. The cryptography system of claim 1, wherein the cryptography controller comprises:

a key processor receiving the input key set for generating the cryptography keys; and

a controller receiving the security level parameters for reconfiguring the multiple cryptography algorithm set section based on the security level parameters, the controller receiving the cryptography keys from the key processor and selectively providing the cryptography keys to the multiple cryptography algorithm set section based on the security level parameters.

9. The cryptography system of claim 8, wherein the key processor comprises:

a key table containing a plurality of pre-stored keys; and

a programmable key manipulator for generating the cryptography keys based on the input key set and pre-stored keys selected from the key table.

10. The cryptography system of claim 9, wherein the cryptography keys includes a plurality of key hopping sequences, the key processor further comprises:

a pseudo random bit generator for generating pseudo random bits based on the input key set,

wherein the programmable key manipulator generates the key hopping sequences using the pseudo random bits generated by the pseudo random bit generator.

11. The cryptography system of claim 1, wherein the cryptography algorithms performed by the multiple cryptography algorithm set section are selected from a group comprising RC5, DES, AES, XOR-based array scrambling, selective encryption, VEA (video encryption algorithm), RPB (random rotation in partitioned blocks), MHT (multiple Huffman table), RAC (randomized arithmetic coding), REC (randomized entropy coding), and encryption enabled entropy encoding/decoding.

12. The cryptography system of claim 1, wherein the cryptography algorithms performed by the multiple cryptography algorithm set section include one or more cryptography algorithms for multimedia content and one or more cryptography algorithms for network communication.

13. The cryptography system of claim 1, wherein one or more security level parameters received by the cryptography controller are encrypted and the cryptography controller decrypts the security level parameters.

14. The cryptography system of claim 1, wherein the multiple cryptography algorithm set section and the cryptography controller are integrated into a silicon-on-chip (SoC) structure.

15. A cryptography method implemented on a cryptography system, comprising:

(a) receiving input data;

(b) receiving, by a cryptography controller, an input key set and one or more security level parameters;

(c) generating, by a cryptography controller, a plurality of cryptography keys based on the input key set; and

(d) performing, by a multiple cryptography algorithm set section, a plurality of selected cryptography algorithms in a selected sequence on the input data, wherein the selected cryptography algorithms or the selected sequence or both are determined by the security level parameters, and wherein the selected cryptography algorithms are performed using the plurality of cryptography keys.

16. The cryptography method of claim 15, further comprising, prior to step (d):

(e) performing, by a redundancy removal section, spatial and/or temporal redundancy removal on input video data; and

(f) performing, by an entropy encoding section, entropy encoding on video data generated by step (e),

wherein the cryptography algorithms in step (d) are encryption algorithms and are performed on video data generated by step (f).

17. The cryptography method of claim 15, wherein the cryptography algorithms in step (d) are decryption algorithms, the method further comprising, after step (d):

(e) performing, by an entropy decoding section, entropy decoding on video data generated by step (d); and

(f) performing, by a redundancy recovery section, spatial and/or temporal redundancy recovery on video data generated by step (e).

18. The cryptography method of claim 15, wherein step (c) comprises:

(c1) pre-loading a plurality of pre-stored keys in a key table; and

(c2) generating the cryptography keys based on the input key set and pre-stored keys selected from the key table.

19. The cryptography system of claim 18, wherein the cryptography keys includes a plurality of key hopping sequences, and wherein step (c) further comprises:

(c3) generating pseudo random bits based on the input key set; and

(c4) generating the key hopping sequences using the pseudo random bits.

20. The cryptography system of claim 15, wherein the plurality of cryptography algorithms are selected from a group comprising RC5, DES, AES, XOR-based array scrambling, selective encryption, VEA (video encryption algorithm), RPB (random rotation in partitioned blocks), MHT (multiple Huffman table), RAC (randomized arithmetic coding), REC (randomized entropy coding), and encryption enabled entropy encoding/decoding.