Poul-Henning Kamp

Poul-Henning Kamp is a Danish computer software developer known for work on various projects including FreeBSD and Vinyl Cache. 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 MD5crypt implementation of the MD5-based 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, the implementation of the malloc library call, and the FreeBSD and NTP timecounters code, and the interface with David Mills.

Vinyl Cache He is the lead architect and developer for the open source Vinyl Cache project (formerly Varnish Cache ), an HTTP accelerator.

Dispute with D-Link

In 2006, Kamp had a 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. The dispute was resolved in April 2006.

Beerware Publications 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: 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 ACM Queue: A Generation Lost in the Bazaar Communications of the ACM 2011: The Most Expensive One-Byte Mistake Communications of the ACM 2011: The One-Second War