| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a decryption system capable of acquiring decrypted text without calculating true secrete information aand not by gathering K pieces of secrete information.SOLUTION: The decryption system includes a terminal device and N proxy calculation devices n. The proxy computing devices n include a storage unit in which dispersed secrete information f(j) and a calculation unit for finding a value f(j)τby using informationτcorresponding to cipher text and the dispersed secrete information f(j). The terminal device includes a request unit for requesting the proxy computing devices n to find the value f(j)τfrom the informationτcorresponding to cipher text, and a decryption unit for finding information aτcorresponding to the cipher text by using K values f(j)τ, k=1, 2, etc., to K, jbeing one of j,j, etc., to jdiffering for each k.</p> |
