| 摘要 |
PROBLEM TO BE SOLVED: To prevent a denial-of-service attack using deduplication storage technology.SOLUTION: When writing data in a nonvolatile storage unit 30, a writing unit 21 generates a random number and then generates an additional key on the basis of the generated random number. A storage device 1 excludes data duplication by using the additional key generated by the writing unit 21 as a key together with a hash value. A correspondence table 12 stores the hash value, additional key, and data identifier in accordance with one another, and a hash value table 13 stores the hash value, additional key, data storage position, and number of references in accordance with one another. |
