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In Excel and Word 95 and prior editions a weak protection algorithm is used that converts a password to a 16-bit verifier and a 16-byte XOR obfuscation array [1] key. [4] Hacking software is now readily available to find a 16-byte key and decrypt the password-protected document. [5] Office 97, 2000, XP and 2003 use RC4 with 40 bits. [4]
A main encryption/decryption key is derived from user's password by PBKDF2 function. [2] Particular data binary large objects can be encrypted in a way that salt is added and/or an external user-prompted password (aka "Strong Key Protection") is required. The use of a salt is a per-implementation option – i.e. under the control of the ...
Such password-protected documents are not encrypted, and data sources from a set password are saved in a document's header. Password to protect workbook is an exception – when it is set, a document is encrypted with the standard password "VelvetSweatshop", but since it is known to the public, it actually does not add any extra protection to ...
New features include native Office Open XML file format support, which debuted in Office 2007 for Windows, [180] and stronger Microsoft Office password protection employing AES-128 and SHA-1. Benchmarks suggested that compared to its predecessor, Office 2008 ran at similar speeds on Intel machines and slower speeds on PowerPC machines. [ 195 ]
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