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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]
Password to open a document [55] Password to modify a document [56] Password to unprotect the worksheet; Password to protect workbook; Password to protect the sharing workbook [57] All passwords except password to open a document can be removed instantly regardless of the Microsoft Excel version used to create the document. These types of ...
Thunder Tables is the company's own technology developed to ensure guaranteed recovery of Microsoft Word and Microsoft Excel documents protected with 40-bit encryption.The technology first appeared in 2007 and employs the time–memory tradeoff method to build pre-computed hash tables, which open the corresponding files in a matter of seconds instead of days.
In the simple case where the reduction function and the hash function have no collision, given a complete rainbow table (one that makes sure to find the corresponding password given any hash) the size of the password set |P|, the time T that had been needed to compute the table, the length of the table L and the average time t needed to find a ...
The purpose of password cracking might be to help a user recover a forgotten password (due to the fact that installing an entirely new password would involve System Administration privileges), to gain unauthorized access to a system, or to act as a preventive measure whereby system administrators check for easily crackable passwords. On a file ...
The password can contain up to 255 characters and uses AES 128-bit advanced encryption by default. [68] Passwords can also be used to restrict modification of the entire document, worksheet or presentation. Due to lack of document encryption, though, these passwords can be removed using a third-party cracking software. [69]
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Ophcrack is a free open-source (GPL licensed) program that cracks Windows log-in passwords by using LM hashes through rainbow tables.The program includes the ability to import the hashes from a variety of formats, including dumping directly from the SAM files of Windows, and can be run via the command line or using the program’s GUI (Graphical user interface).