I have a very important sheet which is password protected. When I try to open with the password it will not open. What is wrong. I’m using windows 10
Is it an .ods type file or other?
Which version of the office suite
- was the file created with?
- was the file edited (saved) lastly?
- you tried to open now?
If it’s the password to open the file, there’s no solution.
There is exactly one solution, remembering and entering the correct password. (if this is about a .ods or .xlsx password encrypted file, which the questioner preferred to never answer).
Have you done much searching for solution?
Do you understand what a brute force password attack is?
I found an article which suggests that a brute force attack could work depending on the length of the password. If it’s less than 6 characters it should be doable.
And I know that, given how AES encryption in LibreOffice works (with 100000 iterations required to calculate each hash, which is done specifically to make brute-force expensive), that 6-core 12-thread JohnTheRipper process performs about 350 passwords/s on my system; and if your password only uses ascii alphanumeric characters (26 lowercase + 26 uppercase + 10 numbers, no punctuation or special characters, let alone Unicode), there are 626 = 56 800 235 584 6-character passwords, that take more than 5 years to check them all…
For 5-character passwords (less than 6, as you wrote), it would only take a month, though.