Which library to use when you want to create password for a door lock system that can be used only once

Using Arduino Programming Questions
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Good everyone. I new to the Arduino community and so far I love what I am seeing here... I'm also new to coding and I'm working on this project to create a password for my door lock system and it went well .
I decided to store 60 passwords in the memory of the Arduino such that each password can be used only once.... And it has been really difficult for me. I would appreciate any help I terms of library to use and codes that would make me understand the c

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I don’t see a library for this purpose , you need to have a go at coding .

Post up your code !

You are likely to have memory issues storing 60 passwords with a Nano/UNO and might need to look at maybe NanoEvery .
Your program is going to have to look through all the remaining passwords for a match , which may also be time consuming . If you are new to programming this may be a bit hard to get a good algorithm .

Have a go at writing something with say 3 passwords - put them in an array , then you can use the array position to determine if that password has been used - see how it goes and assess what the difficulties might be .

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What does this mean? No two passwords can be the same or each password can only open the door once? Something else?

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Each password can open the door once

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Store the passwords in EEPROM and erase each one after it is used.

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Thanks I would be uploading the code shortly

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Good point other wise which password has been used would be lost if the power fails .

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Thanks

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EEPROM is very limited. I would store the passwords in PROGMEM (FLASH) and keep a bitmap in EEPROM of which have been used.

How long can each 'password' be and what characters do you allow in a password?

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