Tampering monitoring system, management device, protection control module, and detection module

Abstract

A management devicecomprises: a key share generation unitgenerating a plurality of key shares by decomposing a decryption key, the decryption key being for decrypting an encrypted application program generated as a result of encryption of the application program; and an output unitoutputting each of the key shares to a different one of a plurality of detection modules. The detection modules acquire and store therein the key shares. The protection control modulecomprises: an acquisition unitacquiring the key shares from the detection modules; a reconstruction unitreconstructing the decryption key by composing the key shares; a decryption unitdecrypting the encrypted application program with use of the decryption key; and a deletion unitdeleting the decryption key, after the decryption by the decryption unit is completed.