qca2: qca (Qt Cryptographic Architecture) qca2: qca2: QCA aims to provide a straightforward and cross-platform crypto API, qca2: using Qt datatypes and conventions. QCA separates the API from the qca2: implementation, using plugins known as Providers. The advantage of qca2: this model is to allow applications to avoid linking to or explicitly qca2: depending on any particular cryptographic library. This allows one qca2: to easily change or upgrade crypto implementations without needing qca2: to recompile the application. qca2: qca2: QCA was written by Justin Karneges.