The IESG has approved the following document: - 'The scrypt Password-Based Key Derivation Function' (draft-josefsson-scrypt-kdf-05.txt) as Informational RFC This document has been reviewed in the IETF but is not the product of an IETF Working Group. The IESG contact person is Stephen Farrell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-josefsson-scrypt-kdf/ Technical Summary: This document specifies the password-based key derivation function scrypt. The function derives one or more secret keys from a secret string. It is based on memory-hard functions which offer added protection against attacks using custom hardware. Working Group Summary: This was an individual effort to document an external algorithm. It was presented at the CFRG in IETF-92; there is no controversy. Document Quality: It is a good, well-written document; it includes test vectors. An interoperable implementation was written for OpenSSL based on this document. Personnel: Stephen Farrell is AD; Rich Salz is the shepherd