| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for protection from internal analysis by hiding internal processing of a program executed in a text format from a user, and executing the program in a hidden form. SOLUTION: A sending side system 1 sends a program PR1 enciphered by a first cipher key K1A, and a first decipher key K1B enciphered by a second cipher key K2A to a receiving side system 2, the receiving side system 2 extracts the first decipher key K1B by a second decipher key K2B hidden in an interior, the program PR1 is extracted by using the decipher key K1B, and the program PR1 is internally executed. COPYRIGHT: (C)2006,JPO&NCIPI |
