Security Considerations Regarding Compression Dictionaries

Document Type Replaced Internet-Draft (individual)
Author Murray Kucherawy 
Last updated 2019-05-09 (latest revision 2018-11-05)
Replaced by draft-handte-httpbis-dict-sec
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Data compression algorithms benefit from blocks of tuning data called "dictionaries". These can greatly improve data compression speed and/or ratios, but their use and application has numerous potential security issues of concern to the communities using them. This document enumerates security issues known about compression dictionaries at the time of publication so that future proposals for use of dictionaries can benefit from this collected material.


Murray Kucherawy (

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