Currently, a large amount of data is exchanged on Internet on a non-structuralized or half-structuralized way. The XML standard (eXtensible Markup Language) has been become the best solution to show and exchange data, making the structure and content of a document apart. However, some kinds of data are critical and need to be secure. This paper describes two new data exchange security protocols to XML-based applications in order to solve the problems of data heterogeneity and secure. Using the XML standard and concepts of cryptography, the protocols define rules that support different security levels according to the needs of each application. In addition, it presents a comparative evaluation between the two protocols for pointing the advantages and disadvantages of each one.

Keywords : Cryptography; Protocol; XML; Secure Data Exchange.