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Method and apparatus for transition of encryption key during an ongoing media communication session

A technology for encrypting keys and communication sessions, which is applied in the field of distributing encryption keys, and can solve problems such as the impact of media stream encryption and/or decryption

Active Publication Date: 2010-09-15
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the participants in the ongoing communication session may not all receive the new MEK at exactly the same time, switching to the new MEK may result in some media packets being decrypted by the wrong MEK; thus, encryption and / or decryption of the media stream results in negative impact

Method used

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  • Method and apparatus for transition of encryption key during an ongoing media communication session
  • Method and apparatus for transition of encryption key during an ongoing media communication session
  • Method and apparatus for transition of encryption key during an ongoing media communication session

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Embodiment Construction

[0013] Before several embodiments are explained in detail, it is to be understood that the scope of the invention is not limited to the details of construction and the arrangement of elements set forth in the following description or shown in the drawings. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting.

[0014] figure 1 A functional block diagram of a group communication system 100 for implementing an embodiment is shown. The group communication system 100 is also known as a push-to-talk (PTT) system, a network broadcast service (NBS), a dispatch system, or a point-to-multipoint communication system. In one embodiment, the group communication system 100 includes a group communication server (GCS) 102, which may be deployed in a centralized deployment or a regionalized deployment. The group communication server 102 can be implemented using techniques known in the art, and...

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PUM

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Abstract

The disclosed embodiments provide for methods and apparatus for encrypting media using a current media encryption key (MEK), requesting a new MEK, and receiving the new MEK. The method further provides for transitioning from the current MEK to the new MEK and continuing to encrypt the media using the new MEK. In another embodiment, the method provides for decrypting media during an ongoing media communication session, the method provides for receiving encrypted media, and decrypting the encrypted media using a current MEK. The method further provides for requesting a new MEK before the current MEK expires based on its associated expiration time, receiving the new MEK, and continuing to decrypt the encrypted media based on a received MEK indication flag (MIF) that indicates whether the encrypted media is encrypted using the current MEK or the new MEK.

Description

technical field [0001] The present invention relates to point-to-point, point-to-multipoint and broadcast communication systems. More specifically, the present invention relates to methods and devices for distributing encryption keys during a secure media communication session in a communication network. technical background [0002] A class of wireless services for fast, efficient, one-to-one or one-to-many (group) communications has existed in various forms for many years. Typically, these services are half-duplex, where the user presses a "push-to-talk (PTT)" button on the phone / radio to initiate a group communication. These services are traditionally used in applications where one person needs to communicate with a group of people, such as a field service worker or a taxi driver, often referred to as a group communication service. [0003] For secure media communications, the media is encrypted using a Media Encryption Key (MEK) before communicating with the target, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
CPCH04L9/083H04L9/0891H04L2209/601H04L9/065
Inventor 布伦丹·布雷特玛丽亚·马歇尔
Owner QUALCOMM INC