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On the Generation of Transient Numeric Identifiers

The information below is for an old version of the document.
Document Type This is an older version of an Internet-Draft whose latest revision is Active
Authors Fernando Gont , Ivan Arce
Last updated 2021-08-06 (Latest revision 2021-02-02)
Replaces draft-gont-numeric-ids-generation, draft-gont-predictable-protocol-ids
Stream Internet Research Task Force (IRTF)
Expired & archived
Stream IRTF state IRSG Review
Revised I-D Needed
Consensus boilerplate Yes
Document shepherd Shivan Kaul Sahib
Shepherd write-up Show Last changed 2021-02-09
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to Shivan Sahib <>
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


This document performs an analysis of the security and privacy implications of different types of "transient numeric identifiers" used in IETF protocols, and tries to categorize them based on their interoperability requirements and their associated failure severity when such requirements are not met. Subsequently, it provides advice on possible algorithms that could be employed to satisfy the interoperability requirements of each identifier category, while minimizing the negative security and privacy implications, thus providing guidance to protocol designers and protocol implementers. Finally, it describes a number of algorithms that have been employed in real implementations to generate transient numeric identifiers, and analyzes their security and privacy properties. This document is a product of the Privacy Enhancement and Assessment Research Group (PEARG) in the IRTF.


Fernando Gont
Ivan Arce

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)