This package provides bindings to Colin Percival's scrypt implementation (http://www.tarsnap.com/scrypt.html). Scrypt is a key derivation function designed to be far more secure against hardware brute-force attacks than alternative functions such as PBKDF2 or bcrypt. Details of the scrypt key derivation function are given in a paper by Colin Percival, Stronger Key Derivation via Sequential Memory-Hard Functions: http://www.tarsnap.com/scrypt/scrypt.pdf.