Like other OpenBSD projects such as OpenSSH, it has been ported to other systems based on Berkeley Unix such as FreeBSD and NetBSD, and to Solaris and Linux.
[1][2] One of the Linux ports is supported by Intel for use with its proprietary cryptographic software and hardware to provide hardware-accelerated SSL encryption for the open source Apache HTTP Server.
The OpenBSD implementation of IPsec, the packet-level encryption protocol, was altered so that packets can be decoded in batches, which improves throughput.
On 11 December 2010, a former government contractor named Gregory Perry sent an email to OpenBSD project leader Theo de Raadt alleging that the FBI had paid some OpenBSD ex-developers 10 years previously to compromise the security of the system, inserting "a number of backdoors and side channel key leaking mechanisms into the OCF".
Theo de Raadt made the email public on 14 December by forwarding it to the openbsd-tech mailing list and suggested an audit of the IPsec codebase.