| Now the problem of security and authentication has become urgent and has to be solved in order to avoid its restriction to the development of e-Business. Today the research on net security is in its initial stage at home. Based on the solution scheme of software as well as hardware, this paper put forward an effective system which integrated information security, identification and digital signature in one smart card.Data encryption and information authentication are separated conventionally, such as the Data Encryption Standard of America which encrypts the data only and the Digital Signature Standard which authenticates the information only. The steady improving of calculating speed and decryption technology makes it not enough to provide security for the existing algorithms with the continuing development of computer hardware.This paper makes a tracing research on the AES which was present by the NIST for the next centenary's data encryption. Based on the deeply investigation to the mathematical theory and principle and specification of AES, an effective implementation of AES block cipher is completed and the encryption and decryption are also completed by using C language.In this paper, the RSA public-key cryptosystem and digital signature are also discussed deeply. We studied in detail the Diffie-Hellman share secret protocol and present an improved scheme of this protocol which could resist middle -insert-attack effectively.At last, based on the theory discussed above, we present a quadratic authentication ancl encryption system which could complete encryption/decyption, identify authentication and signature functions and integrated these functions in one smart card.This system makes full use of the security of the AES and the RSA algorithms and the fast speed of TMS320C64X DSP chip. It could be widely used in finance, telecommunication, medical and insurance etc. With the development of Internet and e-Business, this card will has a prosperous market in the future.
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