Security is an emergent property of a system consisting of users, software and hardware. Thus, a programmer cannot prove security of a system but merely assert

Security is an emergent property of a system consisting of users, software and hardware. Thus, a programmer cannot prove security of a system but merely assert its certain behaviour. Langsec does just that. No, it can never be used to build secure systems. Yes, it can be used to solve practical problems making things more secure.