Dropbear (software)

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Developer(s)Matt Johnston
Initial releaseApril 2003, 06; 16 years ago (06-04-2003)
Stable release2019.78 (March 27, 2019; 10 months ago (2019-03-27)) [±][1]
Repository Edit this at Wikidata
Written inC
Operating systemUnix-like
TypeRemote access
LicenseMIT license

Dropbear is a software package written by Matt Johnston that provides a Secure Shell-compatible server and client. It is designed as a replacement for standard OpenSSH for environments with low memory and processor resources, such as embedded systems. It is a core component of OpenWrt and other router distributions.


Dropbear implements version 2 of the Secure Shell (SSH) protocol.[2]

The cryptographic algorithms are implemented using third-party cryptographic libraries included internally in the Dropbear distribution. It derives some parts from OpenSSH to handle BSD-style pseudo terminals.[3]


Dropbear implements the complete SSH version 2 protocol in both the client and the server. It does not support SSH version 1 backwards-compatibility to save space and resources, and to avoid the inherent security vulnerabilities in SSH version 1. SCP is also implemented.[4] SFTP support relies on a binary file which can be provided by OpenSSH or similar programs. FISH works in any case and is supported e.g. by Konqueror. Supports elliptic curve cryptography for key exchange as of version 2013.61test.[5]

See also[edit]


  1. ^ "Dropbear ChangeLog". 2019-03-27. Retrieved 2019-04-17.
  2. ^ "Ubuntu Manpage: dropbear - lightweight SSH2 server". Ubuntu.com web site. Canonical, Inc. Archived from the original on 16 September 2011. Retrieved 20 June 2011.
  3. ^ https://matt.ucc.asn.au/dropbear/dropbear.html Dropbear implementation details
  4. ^ https://secure.ucc.asn.au/hg/dropbear/file/5608a5a61c2a/scp.c
  5. ^ https://matt.ucc.asn.au/dropbear/CHANGES

External links[edit]