Fortify Software is set to acquire Secure Software, a move aimed at strengthening the development tools vendor's presence in businesses that use IBM's Rational products.

Secure Software, which was founded in 2002, sells software that analyses source code for security flaws. It is designed to work with integrated development environments like the IBM-sponsored Eclipse project and Visual Studio.

Fortify sells similar security auditing tools, but with the Secure Software acquisition, it will now have better integration with IBM's Rational Unified Process (RUP) framework, said Mike Armistead, vice president of corporate development with Fortify.

In addition to its CodeAssure analysis software, Secure Software has formalised a set of best practices for secure software development, called CLASP (Comprehensive, Lightweight Application Security Process). This is sold as a plug-in to IBM's Rational products.

Founded in 2002, Secure Software counts CA, and the Depository Trust and Clearing as clients. The company has about 20 employees, Armistead said.