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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 protect workbook; Password to protect the sharing workbook [53] 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 passwords are used primarily for shared work on a document. Such password-protected documents are not ...
File locking is a mechanism that restricts access to a computer file, or to a region of a file, by allowing only one user or process to modify or delete it at a specific time, and preventing reading of the file while it's being modified or deleted.
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The password can contain up to 255 characters and uses AES 128-bit advanced encryption by default. [64] 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. [65]
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Be aware, if the picture was sent in an unsupported file format, such as TIFF, you may not be able to view it. Ask the sender to resend the picture using JPG or GIF file format. Check the attachments. The image sent may have been sent as an attachment rather than an embedded image.
This means that information and its control can now be separately created, viewed, edited and distributed. A true IRM system is typically used to protect information in a business-to-business model, such as financial data, intellectual property and executive communications. IRM currently applies mainly to documents and emails.