iamnotanumber © card system is a software system which uses a specially designed encryption / decryption algorithm for the creation of credit and debit cards which are numberless but contain , instead , images based on personal information provided by the card user and information provided by the card issuing organization . these numberless cards require a password supplied by the card user in order to be used at point - of - transaction terminals . the system can also be used to produce drivers &# 39 ; licenses , health insurance cards , social security cards and special id cards for organizations which may wish to keep not only their employee identities hidden but the identities of the organizations hidden as well .