DATA PROVIDING SYSTEM, DATA RECEIVING SYSTEM, DATA PROVIDING METHOD, DATA PROVIDING PROGRAM AND DATA RECEIVING PROGRAM

摘要

PROBLEM TO BE SOLVED: To prevent the risk of wiretapping or alteration in downloading and installing application software stored in an external server into an MFP.

SOLUTION: Three encrypted files are included in an application package 30 for distribution. Among them, an application file 32 to be distributed is encrypted with a common key system. In addition, a digest file 34 including a hash value of the application file 32 and an application information file 36 including a license key are each encrypted with a public key system.

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