Patterns Transform Architectures

Software patterns have been used to guide developers and to disseminate expert knowledge. But patterns can also be thought of as program transformations. Security patterns are architectural. Therefore, program transformations derived from those patterns transform architecture. This paper describes how we used a catalog of security patterns to produce a catalog of security-oriented program transformations. These transformations can be used to make architectural changes that make systems more secure. This paper is a first example of applying patterns to actively transform architectures.