AES-CBC + Elephant diffuser, A Disk Encryption Algorithm for Windows Vista

Niels Ferguson

Abstract

The Bitlocker Drive Encryption feature of Windows Vista poses an interesting set of security and performance requirements on the encryption algorithm used for the disk data. We discuss why no existing cipher satisfies the requirements of this application and document our solution which consists of using AES in CBC mode with a dedicated diffuser to improve the security against manipulation attacks.

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This paper can be downloaded from the Microsoft download site

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Practical Cryptography