Falaj 14: Checksum Match

A checksum is a fixed-length fingerprint of a file's contents. If two files have the same checksum they are, for practical purposes, identical, and if one byte differs the checksum changes completely. That makes checksums ideal for picking one file out of a crowd without opening every file.

The ledger file in your home directory records the fingerprint of the sealed slip. The slips directory holds dozens of files, and only one produces that fingerprint. Compute checksums for the slips with sha256sum and compare them with the ledger's value. The slip's name is the clue you need next: in the vault directory there is a key file with the same stem, and it holds the password.

Compare the whole value, not the first few characters. This is a simulated shell over invented files: it understands a teaching subset of commands, and help lists them. When you have the password for level 15, run login 15 <password> or paste it into the answer box.