Fermath - The Misuse of RC4 in Microsoft Word and Excel

The Misuse of RC4 in Microsoft Word and Excel

Written by Giuseppe Bonfà

Wednesday, 19 December 2007

This Report is not recent, but is very interesting under many aspects:

Well designed Analysis Approach for a Generic CryptoTarget
Concrete Cryptanalysis and successive Attack
Evidence of Badly Designed Conceptual and Logical Crypto Architecture

In this report, we point out a serious security flaw in Microsoft Word and Excel. The stream cipher RC4 [9] with key length up to 128 bits is used in Microsoft Word and Excel to protect the documents.

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