In terms on encryption, it is well-known that security by obscurity is a bad idea. A well-designed encryption system should be safe even if it open-source. E.g.

In terms on encryption, it is well-known that security by obscurity is a bad idea. A well-designed encryption system should be safe even if it open-source. E.g. PGP. Having the source code should not help one bit. However, access to the OS source code does let people search for various yet-undiscovered exploits, and use them for evil.