Patent ID: 8090942
Filing Date: 2012-01-03
Classification: G06F,H04L

Abstract:
1. A .Zip file format data container stored on a computer, said data container including: an encrypted data file, wherein said encrypted data file has been encrypted by an application using symmetric encryption, wherein said symmetric encryption employs a symmetric key having one of a plurality of available bit lengths, wherein said symmetric key is asymmetrically encrypted to form an encrypted symmetric key, wherein said data container is constructed by an application in accordance with a .Zip file format, wherein said data container includes a local record header for said encrypted data wherein said encrypted symmetric key is placed in said data container, wherein said data container includes a central directory record identifying the location of said encrypted data file inside said data container, wherein said central directory record is used to access said encrypted data file in the process of decrypting said encrypted data file, wherein said data container also includes a local decryption header, wherein said local decryption header includes an identification of the one of said plurality of available bit lengths that was used in said symmetric key to encrypt said symmetric key wherein said local decryption header is separate from said central directory record.