| 摘要 |
PROBLEM TO BE SOLVED: To provide a client terminal, a server, a system, method and a program for safely and efficiently verifying the safety of an online file.SOLUTION: A client terminal 10 creates a file queue, creates a random vector, creates, on the basis of the product of the created file queue and random vector, a verification tag that is a tag for file verification, has the created verification tag stored by verification tag storage means 31, and transmits the file to a server. The client terminal 10 transmits the random vector to the server separately from file transmission. Tag information that is the product of the file queue created on the basis of the received file and the received random vector is calculated by the server. The client terminal 10 receives the calculated tag information from the respective server, and verifies the safety of the file transmitted to the server on the basis of the received tag information and the verification tag stored in the verification tag storage means 31. |
