PURPOSE: To realize a security means which is especially effective in an information recording medium of a specific use form wherein revelation of effect of value information is only once and can be realized at a low cost.

CONSTITUTION: An information recording medium is provided wherein value information or both of the value information and recognition information of a note issuing number or the like are held, and cryptographic information which can obtain, at least, one information in such informations as a variable is latently recorded so as to be recognized by developing only once by heat.