Patent ID: 7564977
Filing Date: 2009-07-21
Classification: H04L

Abstract:
1. A method for providing confidentiality of a combination of content of a message and a sender of the message, said method comprising the steps of: a final agent computer providing to a first agent computer, interposed between said sender and said final agent computer, a first encryption key, said first agent computer but not said final agent computer knowing an identity of said sender; said final agent computer providing to a second agent computer, interposed between said sender and said final agent computer, a second encryption key, said second agent computer knowing an identity of said sender; said first agent computer generating a third encryption key and providing to said sender said first encryption key and said third encryption key; said second agent computer generating a fourth encryption key and providing to said sender said second encryption key and said fourth encryption key; said first agent computer receiving from said sender a message encrypted with said first, second, third and fourth keys, and in response, decrypting said message based on said third key, and afterwards providing the message decrypted based on said third key to said second agent computer, and in response, said second agent computer decrypting, based on said fourth key, said message provided by said first agent computer; and providing the message decrypted based on said third and fourth keys to said final agent computer, and in response, said final agent computer decrypting, based on said first and second keys, said message decrypted based on said third and fourth keys.