Patent ID: 8230223
Filing Date: 2012-07-24
Classification: H04L

Abstract:
1. A computer-implemented method for obtaining, at a recipient client, original message text from a policy-encrypted message transmitted by a sending client, the computer-implemented method comprising: extracting from the policy-encrypted message a user ID that uniquely identifies a user associated with the sending client, an encrypted message key formed by encrypting a message key with at least a combination of a user recovery key and a user key, and a user key descriptor, the user key being formed from the user key descriptor and a server long term key; retrieving a server recovery key; computing the user recovery key using at least the user ID and the server recovery key; decrypting the encrypted message key using at least the combination of the user key and the user recovery key to recover the message key; and providing to the recipient client the message key for decrypting, an encrypted message contained in the policy-encrypted message and obtaining the original message text.