Software encryption / decryption method, software encryption system and software decryption system

摘要

When encrypting the software, two or more algorithms are employed. On the other hand, in the software decryption process, a decryption algorithm corresponding to these two or more encryption algorithms is prepared. In the software encryption process, combination information of the encrypted algorithm together with the encryption software is passed to the software decryption process. In the software decryption process, the encryption algorithm is decrypted by selecting an inverse algorithm possessed by the decryption unit on the basis of the combination information of the above-described algorithm.