Patent ID: 7505316

Claim:
A data storage comprising a functioning part responsive to an unauthorized data reading operation attempted to be carried out on a storage part storing target data, to cause predetermined data, different from the target data, to be read out instead of the target data, wherein: said functioning part responds to a data reading operation attempted to be carried out on the storage part storing target data for a case where said data storage is handled in a predetermined manner to cause predetermined data, different from the target data, to be read out instead of the target data, and is configured such that said functioning part causes addressing in a manner different from a proper manner when said data storage is handled in said predetermined manner, upon addressing said storage part; and predetermined external terminals are previously short-circuited, and a configuration is provided such that the short-circuit of the predetermined external terminals is removed when the data storage is handled in said predetermined manner, and said functioning part, which causes addressing in a predetermined manner, different from the proper manner, when said data storage is handled in said predetermined manner, carries out the proper addressing when said predetermined external terminals are short-circuited while carrying out the predetermined addressing, different from the proper addressing, when said short-circuit is removed.