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What is OpenBSD? – Definition, History, Features, and More

What is OpenBSD? – Definition, History, Features, and More

OpenBSD Definition

OpenBSD is an operating system from the group of Unix derivatives, which is freely available under the BSD license.

It was split off in 1995 by Theo de Raadt of NetBSD. The first 386BSD- based open-source operating system.

However, OpenBSD is known for insisting on its developer’s open-source, free documentation, strong position against software – licenses, focus on security, and accuracy of source code.

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History of OpenBSD

In December 1994, Theo de Raadt – co-founder of NetBSDs, an experienced developer and member of the core team – was asked to relinquish his position. At the same time, his access blocks the source code repository.

In October 1995, Theo de Raadt founded OpenBSD as a new project split of NetBSD 1.0. The first release, OpenBSD 1.2, was released in July 1996, followed by OpenBSD 2.0 in October of the same year.

Since then, OpenBSD follows the schedule to release a new version every six months. It maintains and supports for one year.

What are Free software and free documentation of OpenBSD?

  • When OpenBSD launched, Theo de Raadt decided to make the source code readable by anyone at any time.
  • Therefore, he set up with the help of Chuck Cranor a public anonymous CVS version management server.
  • And also, It was the first of its kind in the world of software development: at that time, it was common for only a small team of developers who accesses the CVS management system.

What is Security Features?

  • Initially, the OpenBSD team did not prioritize security audits. In 1996, the year after the demerger of NetBSD, an attacker discovered a security vulnerability, causing the team to spend a long time looking for security issues in their existing code.
  • They found the OpenBSD project Shortly, Theo de Raadt contacted by the local software security company Secure Networks, Inc. (SNI). She worked on Ballista, a tool for security audits of networks.
  • And also, It designs to exploit any security holes in software. It was in close agreement with Theo de Raadt’s interest in security.


  • Because of security enhancements, cryptography and integrated PF firewall [OpenBSD] suitable for use in the security industry.
  • It also uses commonly on the Web and other servers because they need to be resistant to crackers and DoS attacks.
  • And also, Due to the inclusion of spam in the base system, OpenBSD sometimes also uses as a spam filter.

What are the Sales and Marketing of OpenBSD?

The source code can obtain via anonymous CVS or CVSup, binary final and development versions can download via FTP and HTTP.

  • Complete CD sets, including documentation, illustrations, a selection of stickers, and the title song of the respective release, could order up to and including version 6.0 for a fee online.
  • The CD sets are one of the few sources of revenue for the project and ensure its existence.
  • However, these discontinue the release of version 6.1. Hardware, bandwidth, were from the income Hackathonand other purchases.

What are the own developments of OpenBSD?

From OpenBSD originated many own events. Including:

  1. LibreSSL, a free implementation of the TLS protocol, split off from OpenSSL version 1.0.1g
  2. OpenBGPD, a free implementation of BGP 4
  3. OpenOSPFD, a free implementation of the routing protocol OSPF
  4. OpenNTPD, a simple alternative to the NTP daemon from
  5. OpenSMTPD, an open SMTP daemon with IPv4 /IPv6, PAM, Maildir and support for virtual domains.

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