Patent ID: 7178033
Filing Date: 2007-02-13
Classification: G06F,H04L

Abstract:
1. In a system for providing restrictive access to electronic data, wherein the electronic data is structured in a format that controls access to contents in the electronic data, a method for securing the electronic data in the format, the method comprising: generating an encrypted data portion by encrypting the electronic data with a first key according to a predetermined cipher scheme; encrypting the first key with a second key, if the electronic data is not classified; encrypting the first key with the second key together with a clearance key, if the electronic data is classified; encrypting the second key to produce an encrypted version of the second key; applying access rules to protect the encrypted version of the second key; and integrating a header with the encrypted data portion to produce a secured file, wherein the header includes the encrypted first key, the encrypted second key and the access rules.