Proprietary cryptography is a term used to describe custom encryption techniques
that are kept secret by its designers to add additional security. It is questionable if
such an approach increases the cryptographic strength of the underlying mathematical
algorithms. The security of proprietary encryption techniques relies entirely on the
competence of the semi-conductor companies, which keep the technical description
strictly confidential after designing. It is difficult to give a public and independent
security assessment of the cryptography, without having access to the detailed information of the design
