The Trustworthy Software Initiative (TSI) is a UK public good activity, sponsored by the UK government's Centre for the Protection of National Infrastructure, with stated aim of improving software.
TSI evolved from a number of previous activities:
A study by the Cabinet Office, Central Sponsor for Information Assurance (CSIA) in 2004-5 which identified a pervasive lack of secure software development practices as a matter for concern
A Department of Trade and Industry (DTI – predecessor of BIS) Global Watch Report in 2006 which noted a relative lack of secure software development practices in the UK
The Technology Strategy Board (TSB) Cyber Security Knowledge Transfer Network (CSKTN) Special Interest Group (SIG) on Secure Software Development (SSD, 2007-8)
The TSB / Foreign and Commonwealth Office (FCO) Science and Innovation Network (SIN) Multinational Workshop “Challenges to building in … information security, privacy and assurance”, held in Paris in March 2009
The Secure Software Development Partnership (SSDP) Study Period, funded jointly by TSB and the Centre for Protection of National Infrastructure, which ran in 2009-2010
The Trustworthy Software Initiative (TSI) was established, originally as the Software Security, Dependability and Resilience Initiative (SSDRI), in July 2011 to draw together the activity and provide a single point of reference for guidance and information about trustworthy software development. It was renamed from SSDRI to TSI in September 2012.
TSI considers that there are five facets of trustworthiness:
Safety - The ability of the system to operate without harmful states
Reliability - The ability of the system to deliver services as specified
Availability - The ability of the system to deliver services when requested
Resilience - The ability of the system to transform, renew, and recover in timely response to events
Security - The ability of the system to remain protected against accidental or deliberate attacks
This definition of trustworthiness is an extension of a widely used definition of dependability, adding a 5th Facet of Resilience.
TSI is operated on behalf of UK government by the Cyber Security Centre, University of Warwick.
It is managed by a technical director, a president representing stakeholder interests, and a team of vice-presidents responsible for particular communities of interest. Incumbent as of 2015 were technical director Ian Bryant and president Sir Edmund Burton.
Making its Trustworthy Software Framework (TSF) into British Standards (BS) Publicly Available Specification (PAS) 754
Starting promulgation of Software Trustworthiness across Education, initially targeting the "technical" undergraduate community, with the assistance of the BCS / IET
Working with partners on means of Verification of Organisational Competence in Software Trustworthiness (TickITPlus)
