Patent ID: 8335919
Filing Date: 2012-12-18
Classification: H04L

Abstract:
1. A method comprising the steps of: encrypting a message to develop an encrypted message, said encrypted message being decryptable using a first decryption key; encrypting said first decryption key with encryption keys of a plurality of target recipients, to develop a plurality of recipient associated encrypted decryption keys; and transmitting said encrypted message; sending said recipient associated encrypted decryption keys to a server for inclusion in a list of authorized encrypted decryption keys; and thereafter changing at least one but less than all of said recipient associated encrypted decryption keys on said list, but not said encrypted message itself which remains unchanged, said changing thereby impeding access to the message by at least one target recipient for which the at least one recipient associated encrypted decryption key was changed, but preserving access, by way of unchanged ones of the recipient associated encrypted decryption keys, to said unchanged encrypted message.