On AES Algorithm And Its Applications In Smart Cards

The DES (Data Encryption Standard) and DES-like algorithms,which is extensively used in mordern society,couldn't supply adequate security for sensitive data. Whereas majority cryptographic products used nowdays use DES and DES-like algorithms for their encyption algorithms.People need much more secure encryption algorithms and cryptographic products eagerly.The high secure encryption algorithm AES (Advanced Encryption Standard) can be used to substitute the DES and DES-like encryption algorithms,Researching and Exploiting the AES cryptographic products will be the mega topic in the cryptology community,a great many works need to be done.This article researches three problems:the AES algorithm security,AES algorithm implementing problem and the AES applications in smart card.In chapter tow we mostly discuss AES algorithm design theory and its security problems,which profoundly analyse the SPN structure and Wide Trail Design Strategy of AES and summarize ultramodern AES analytic results;In chapter three,we discuss implementing problems of AES algorithm,which primarily discuss software implementation means, we render a new implementing mean;In chapter four,we research the applications of AES in smart cards.In this chapter, we disign a hybrid data transmission system which can be used in smart cards securely.