Encryption
Cryptographic hash functions
A hash function which is considered practically impossible to invert, that is, to recreate the input data from its hash value alone.
Checking Hashes
Calculate SHA-1 checksum
shasum -a 1 <file>
Calculate SHA-256 checksum
shasum -a 256 <file>
Calculate SHA-512 checksum
sha512sum <file>
Calculate MD5 checksum
md5 <file>