Poul-Henning Kamp

Poul-Henning Kamp

Poul-Henning Kamp with Tux
Born (1966-01-20) 20 January 1966
Residence Slagelse, Denmark
Nationality Danish
Other names phk
Occupation Programmer
Employer Self-employed

Poul-Henning Kamp (born 1966) is a Danish computer software developer known for work on various projects. He currently resides in Slagelse, Denmark.

Involvement in the FreeBSD project

Poul-Henning Kamp has been committing[1] to the FreeBSD project for most of its duration. He is responsible for the widely used MD5crypt implementation of the MD5 password hash algorithm,[2][3] a vast quantity of systems code including the FreeBSD GEOM storage layer, GBDE cryptographic storage transform, part of the UFS2 file system implementation, FreeBSD Jails, malloc library, and the NTP timecounters code.

Most notable projects

He is the lead architect and developer for the open source Varnish cache project, an HTTP accelerator and Ntimed, an NTP daemon meant to replace ntpd.

His dispute with electronics manufacturer D-Link in which he claimed they were committing NTP vandalism by embedding the IP address of his NTP servers in their routers was resolved on 27 April 2006.[4][5]


FOSDEM 2014: "NSA operation ORCHESTRA Annual Status Report" by Kamp

A post by Poul-Henning on the FreeBSD mailing lists[6] is responsible for the popularization of the term bike shed discussion, and the derived term bikeshedding, to describe Parkinson's law of triviality in open source projects - when the amount of discussion that a subject receives is inversely proportional to its importance.

Poul-Henning Kamp is known for his preference of a Beerware license to the GNU General Public License (GPL).[7]


Poul-Henning Kamp has published a substantial number of articles over the years in publications like Communications of the ACM and ACM Queue mostly on the topics of computing and time keeping. A selection of publications:


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