PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols
RFC 8264, “PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols”, is a Proposed Standard document published in October 2017 by P. Saint-Andre, M. Blanchet. It obsoletes RFC 7564. The canonical text is published by the RFC Editor.
Abstract
Application protocols using Unicode code points in protocol strings need to properly handle such strings in order to enforce internationalization rules for strings placed in various protocol slots (such as addresses and identifiers) and to perform valid comparison operations (e.g., for purposes of authentication or authorization). This document defines a framework enabling application protocols to perform the preparation, enforcement, and comparison of internationalized strings ("PRECIS") in a way that depends on the properties of Unicode code points and thus is more agile with respect to versions of Unicode. As a result, this framework provides a more sustainable approach to the handling of internationalized strings than the previous framework, known as Stringprep (RFC 3454). This document obsoletes RFC 7564.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8264 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 8263 Group Domain of Interpretation GROUPKEY-PUSH Acknowledgement Message
- RFC 8265 Preparation, Enforcement, and Comparison of Internationalized Strings Representing Usernames and Passwords
- RFC 8262 Content-ID Header Field in the Session Initiation Protocol
- RFC 8266 Preparation, Enforcement, and Comparison of Internationalized Strings Representing Nicknames
- RFC 8261 Datagram Transport Layer Security Encapsulation of SCTP Packets
- RFC 8267 Network File System Upper-Layer Binding to RPC-over-RDMA Version 1
- RFC 8260 Stream Schedulers and User Message Interleaving for the Stream Control Transmission Protocol
- RFC 8268 More Modular Exponentiation Diffie-Hellman Key Exchange Groups for Secure Shell