Abstract: To provide an authentication technology acquiring high security with a simple configuration. In an information processing device utilizing a user's input operation for authentication, an input frame is displayed to the user, the user is prompted to input a keyword to within the input frame, a magnitude of the input by the user is judged, and the inputted keyword is judged, results of the judgments are used as authentication information for the authentication. A magnitude of the input may be a size of the input frame and a size of a character, which are designated by the user.

Abstract: The invention provides a casing, equipment unit, fan unit and electronic equipment capable of easily implementing assembling, disassembling, attaching and so forth without using fixture components, tools, and so forth. The structure is made up of casing sections, hinge parts and a coupling part. The casing sections are made up of not less than two sections and enclosing a hosing space, and members for securing the housing space thereby. The hinge parts are members coupled with the casing sections and supporting each casing section. That is, not less than two casing sections couple the edge parts of each casing section, and bendably support each casing section. The coupling part is a member for restraining the casing sections positionally and maintaining and fixing the housing space. That is, the coupling parts detachably couple each casing section to hold the housing space on each casing section.