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#Mac xls locked for editing by microsoft office user for mac#
#Mac xls locked for editing by microsoft office user software#
#Mac xls locked for editing by microsoft office user password#

Office 2013 (Access, Excel, OneNote, PowerPoint, Project, and Word) uses 128-bit AES, again with hash algorithm SHA-1 by default.

#Mac xls locked for editing by microsoft office user password#

With the help of the SHA-1 hash function, the password is stretched into a 128-bit key 50,000 times before opening the document as a result, the time required to crack it is vastly increased.Įxcel and Word 2010 employed AES and a 128-bit key, but the number of SHA-1 conversions doubled to 100,000.

#Mac xls locked for editing by microsoft office user software#

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.

In Microsoft Excel passwords restrict modification of the workbook, a worksheet within it, or individual elements in the worksheet.

In Microsoft Word and in Microsoft PowerPoint passwords restrict modification of the entire document or presentation.

Passwords that do not encrypt a password-protected document have different security level features for each of Microsoft Office applications as mentioned below. Microsoft Office applications offer the use of two main groups of passwords that can be set to a document depending on whether they encrypt a password-protected document or not.

3 Excel worksheets and macro protection.

2 History of Microsoft Encryption password.

I've deleted my recent items list but nothing works.

#Mac xls locked for editing by microsoft office user for mac#

I run MS Office for MAC and Word files opened w/o issue as do other xlsx files. This all started today after a cold start up. I've read about hidden files and such but have no idea where to even look. Would appreciate a solution if anyone has one. I've restarted but it hasn't corrected the issue. After closing I renamed it to the original file name and lo and behold got the same errors again. I then command-delete the original, then copied the newly named file to the folder (after first opening from the desktop to verify all was good. So I renamed the file and saved it to my desktop.

do you want to edit it now?" I click on Edit and the original message of it being locked for editing pops up. I opened RO and after several seconds another pop up says the file "is available. I get the message "File is Locked for Editing" and gives me the option to cancel or open Read Only. There are 8 files in the same folder but only 3 are giving me this problem (I had those 3 opened last week and had no issues). Issue started today when I tried to open a few xlsx files.