That could be a good idea, adding an additional layer of security by checksumming against the filename itself. This would make it even harder for unauthorized users to gain access to specific files or directories without proper clearance.

Incorporating multiple layers of security, including timestamp, filename checksums, and other additional security requirements would make your proposed system even more robust and secure. However, it's important to balance this level of protection with ease of use for the end user so that they can access their data when needed without too much hassle or inconvenience.

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The important part is the usability. First you can select one or two algos that have to be hash matched to gain access to the lock. Second you can specify various levels of difficulty time, time date, time date year, filename, filename file type, filename time, file name file type time date year, etc.... It can be set as easy as most common Algo with filename only or two algos with time, date, year, filene, fieltype. Since the correct Algo hash let's you access the lock, only then will the correct answer as checksummed against the file yield access to file. Much like a password, you won't learn where you're wrong. Also, attempt allowance could be set at 2 or 4 or 999 and then a duration lockout or even filewipe (depending on security needs)