At present there is no software that can break this encryption. In Office 2007 (Word, Excel and PowerPoint), protection was significantly enhanced since a modern protection algorithm named Advanced Encryption Standard was used. Weak passwords can still be recovered quickly even if a custom CSP is on. Choosing a non-standard Cryptographic Service Provider allows increasing the key length. The default protection in Office XP and 2003 was not changed, but an opportunity to use a custom protection algorithm was added. ![]() This protection algorithm is also currently considered to be weak and presents no difficulties to hacking software. In Excel and Word the key length was increased to 40 bits. Hacking software is now readily available to find a 16-byte key and decrypt the password-protected document instantly (because it's only like a Vigenere Cipher). ![]() 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 (page 60/119) ( ) key. History of Microsoft Encryption password ![]() Due to the encryption of a document protected by a password to open it, a hacker needs to decrypt the document to get access to its contents. If a user fails to enter a correct password to the field which appears after an attempt to open a password-protected document, viewing and editing the document will not be possible. It is possible to set this type of password in all Microsoft Office applications. The password that encrypts a document also restricts the user from opening the document.
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