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Speech encryption method and device and decryption method and device

A voice encryption and voice technology, applied in the field of communication, can solve the problems of high real-time requirements, unfavorable real-time requirements of voice communication, high computing complexity, etc., and achieve the effect of reducing complexity and meeting real-time requirements.

Active Publication Date: 2013-06-26
CHINA TELECOM CORP LTD
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  • Abstract
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Problems solved by technology

[0024] At present, voice encryption generally encrypts the encoded voice parameters. However, due to the high real-time requirements of voice communication, high computational complexity is required when encrypting voice, which is not conducive to meeting the real-time requirements of voice communication.

Method used

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  • Speech encryption method and device and decryption method and device
  • Speech encryption method and device and decryption method and device
  • Speech encryption method and device and decryption method and device

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Embodiment Construction

[0058] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0059] The following embodiments of the present invention take the EVRC encoding method as an example to illustrate the gist and technical solutions of the present invention. It should be understood that the embodiments listed in the present invention are not limited to specific speech coding algorithms; for those skilled in the art, other speech coding algorithms can be applied to the technical solution provided by the present invention, such as AMR and the like.

[0060] Figure 4 A flowchart showing an embodiment of a voice encryption method provided by the present invention.

[0061] Such as Figure 4 As shown, the voice encryption method flow 400 includes: Step 402, determining the encryption level of the voice data. For example, the encryption level of voice data can be fixed in a fixed ma...

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Abstract

The invention discloses speech encryption method and device and decryption method and device. The speech encryption method comprises the following steps of: confirming an encryption level of speech data; confirming a frame type of a speech frame; confirming bits of the speech frame to be encrypted according to the encryption level and the frame type; and encrypting the bits to be encrypted. The speech encryption method provided by the invention differentiates bits of frames under different encryption levels and of different frame types according to different safety requirements of speech communication and carries out the grouped encryption processing to the bits which are important to code and decode the speech frame, thereby avoiding encrypting or decrypting all speech frames, lowering the complexity of encryption and decryption calculations and the requirements for software and hardware equipment and satisfying the real-time requirement for encrypting speech communication.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for encrypting voice, and a method and device for decrypting voice. Background technique [0002] With the rapid development of communication technology, people increasingly use voice communication for information exchange and communication in their work and life. Voice communication has become an important way of communication for people, and people have higher and higher requirements for the confidentiality of voice communication. In a mobile communication system, voice will be transmitted in the air for a period of time, so the security requirement for voice transmission is particularly urgent. At present, encrypting the voice transmitted during voice communication is an important way to realize secure communication. [0003] In current communication systems, especially in mobile communication systems, most of the commonly used speech coding algori...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04K1/02H04M1/68
Inventor 林奕琳王庆扬张琳峰孙宇
Owner CHINA TELECOM CORP LTD
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