1. At least one non-transitory computer-readable medium comprising computer-readable code embodied therein, the computer-readable code to provide a computing device with a first binary translator, which in response to execution of the code in a first execution environment of the computing device having a first security level, cooperates with a second binary translator, wherein the second binary translator is within a second execution environment of the computing device with a second security level that is more secure than the first security level, to securely execute a computer program in the second execution environment; wherein instructions of the computer program are encrypted and loaded into the first execution environment; and wherein cooperation includes provision by the first binary translator to the second binary translator of a first execution context of the computer program for use by the secondary binary translator to decrypt and execute a first portion of the computer program in the second execution environment, provision by the second binary translator to the first binary translator of a second execution context of the computer program for emulation, by the first binary translator, of execution of a second portion of the computer program in the first execution environment, and provision by the first binary translator, to the second binary translator, of a third execution context of the computer program for the second binary translator to resume decryption and execution of the computer program in the second execution environment, wherein provision of the third execution context is based at least in part on a result of the emulated execution of the second portion of the computer program in view of the second execution context.