Design And Realization Of Bank Card Access Authentication System

In both commercial and private transaction,authentication of information is of vital concern to all of the participants.Nowadays,authentication which has been formed a set theory system has already -been widely used in every field.The Security Authentication Modal mainly includes entity identity authentication and authentication protocol based on cipher. The entity identity authentication includes passwords authentication,challenge/response authentication scheme, smart card authentication and biometrics authentication;The authentication protocol based on cipher includes authentication based on symmetric private key,Kerberos, authentication based on public key and authentication based on hash chain.At present,the way of bank card access authentication is "Card Numbers+Passwords",and the passwords is fixed.Illegal users can get your passwords by peeping,scouting or other illegal methods,then they are able to obtain all of the available information.In order to improve the security of bank card access authentication system,this paper describes an arithmetic of calculating dynamic passwords based on AES.The scheme of this access authentication is based on challenge/response authentication principle.The Cipher Plaintext and The Cipher Key of AES were composed of card numbers, original passwords and six bits random numbers.Transformed by Hash, the constringent cryptograph as entry passwords can be got.The repetition ratio of constringent cryptograph is 5.83% and the probability of two different numbers corresponding to the same cryptograph is 5.2*10^-8.Due to the random numbers, the entry passwords are different each time. In this way, the security of bank card access authentication system is improved.There are five parts in this paper.First of all,the paper introduces the development status of access authentication system at present;In the second part,this paper narrates the design of bank card acess authentication system in detail based on the differernce between the transaction on web bank and the transaction on POS system;This paper gives contrast of some encryptions,then introduces the amelioration of encryption,and lists the analysis result of feasibility in the third part;This paper illuminates the hardware design and function of encryption calculator in the fourth part;Finally,the paper explains the software realization and gives the flow chart of each module.