It's simply unrealistic to depend on secrecy for security in computer software. You may be able to keep the exact workings of the program out of general circulation, but can you prevent the code from being reverse-engineered by serious opponents? Probably not. The secret to strong security: less reliance on secrets.

Without strong encryption, you will be spied on systematically by lots of people.

The decisions we make about communication security today will determine the kind of society we live in tomorrow.

Whitfield Diffie Quotes