Poul-Henning Kamp with Tux.
Poul-Henning Kamp (born 1966) is a developer known for work on various projects. He currently resides in Slagelse, Denmark.
Involvement in the FreeBSD project
Poul-Henning Kamp has been committing  to the FreeBSD project for most of its duration. He is responsible for the widely used MD5 password hash algorithm, 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.
The Varnish cache project
Dispute with D-Link
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.
A post by Poul-Henning is responsible for the widespread use of the term bikeshed colour to describe contentious but otherwise meaningless technical debates over trivialities in open source projects. This term is in use in, among others, the FreeBSD Project, the Perl Project, and the Subversion Project.
Poul-Henning Kamp has published a substantial number of articles of 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:
- USENIX ATC 1998 FREENIX track, "malloc(3) Revisited"
- USENIX BSDCon 2003, GBDE-GEOM Based Disk Encryption
- USENIX BSDCon 2002, Rethinking /dev and devices in the UNIX kernel
- ACM Queue: Building Systems to be Shared Securely
- ACM Queue: You're doing it wrong
- Communications of the ACM: The Most Expensive One-Byte Mistake
- Communications of the ACM: The One-Second War
- "List of FreeBSD committers on Freebsd.org".
- "PHKs Bikeshed, MD5crypt Is No longer safe". Retrieved 13 March 2013.
- Norris, Jeff (2004). "Mission-Critical Development with Open Source Software: Lessons Learned". IEEE Software (IEEE Computer Society) 21 (1): 42–49. doi:10.1109/MS.2004.1259211,. Retrieved 13 March 2013.
- "D-Link Firmware Abuses Open NTP Servers".
- Kamp, Poul-Henning. "Open Letter to D-Link about their NTP vandalism".
- "A bike shed (any colour will do) on greener grass..", freebsd-hackers mailing list, 1999
- "Poul-Henning Kamp". Retrieved 10 January 2013.
- people.freebsd.org homepage
- phk.freebsd.dk homepage
- Blog in Danish
- Another blog in Danish
- Resolution of D-Link Dispute
- Varnish cache
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