Patent ID: 8724803
Filing Date: 2014-05-13
Classification: H04L,H04W

Abstract:
1. A method of securely obtaining a short-term key for accessing content using a mobile station in a communication system for point-to-multipoint transmission of content to mobile stations, the method comprising: receiving a first value and a first digital signature from a short-term key manager of the communication system for point-to-multipoint transmission of content to mobile stations, wherein the first digital signature is formed from a private key; verifying the first digital signature using a signature scheme based on the private key and a public key, wherein the public key is stored in a first secure memory of a receiving mobile station and the signature scheme is stored in the first secure memory, and wherein the public key stored in the secure memory is not accessible to a mobile equipment of the receiving mobile station; determining that a source of the first digital signature is the short-term key manager; and computing the short-term key using the first value and the public key provided that the short-term key manager is determined to have been the source of the first digital signature, wherein the mobile equipment accesses the content using the short-term key.