Every input has one fixed output.Ī cryptographic hash function is used for verification. A perfect hash function is injective, so there are no collisions. This is how you check for file integrity.Ī hash function is used to map data to other data of fixed size. You can use cksum to calculate a checksum (based on CRC-32) of the copy you now have and can then compare it to the checksum the file should have. If you have download a file, you can never be sure if it got corrupted on the way to your machine. ![]() What are similarities and differences between a "checksum" algorithm and a "hash" function?Ī checksum is used to determine if something is the same.
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