Implementations of the present disclosure are directed to for checking that a to-be-compiled program is well-typed such that the program is secure in a semi-honest model, and include actions of receiving the program, the program being provided in a human-readable, domain-specific programming language and including two or more protocols to provide secure computation based on inputs provided by two or more parties, processing the program in view of a type system to determine whether the program is secure in the semi-honest model, the type system including a secure type system extension provided as a set of typing rules that describe security types that can be assigned to one or more entities of the program, and compiling the program to generate a computer-executable program in response to determining that the program is secure in the semi-honest model.