Casio Computer Co., Ltd.

Kazuo Kurosawa

Makoto Sato

Tsuneharu Takeda

Junji Mori

A sales data processing device of the present invention accepts operations by an operator, opens a drawer, and is provided with a history acquisition unit, a reference information acquisition unit and an irregularity detection unit. The history acquisition unit acquires a history of operations by the operator. The reference information acquisition unit acquires, from references of standard operations set in advance for each of operations that cause the drawer to open, the standard operation references for operations specified in the history. For each of the operations specified in the history, the irregularity detection unit finds a difference from the standard operation reference acquired by the reference information acquisition unit, and if the difference is of at least a predetermined level, detects that the operation is an irregular drawer operation.

Sales data processing device, sales data processing method and computer readable storage medium

In a database, a frequently retrieved column is encrypted using a common key, and other columns are encrypted using a specific row key. Thus, a retrieving process can be performed at a high speed, and the security can be improved. Then, the row and column of the database are encrypted by assuming the plaintext to be encrypted as a bit string, and performing a binary operation with a random bit string. A random bit string is obtained by sequentially generating multidimensional vectors using a nonlinear function by defining a predetermined bit length as 1 word and a plurality of words as components of the multidimensional vector.

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Kanagawa, Japan

Kazuo Kurosawa