The Electric Seal Research Base On Forward-secure Signature And XML Signature

Electric seal is a method to sign a document and it is a kind of electric signature, though a document has some difference compare to other kind of data like program, data of a database, according the speciality of a electric signature to a document, such as view what we signed , validate the signature in a document directly, how to archives a document which has been signed, how to read a document has been archived, it points out that a document is exactly some data with some format data, a document could be disparted as two parts, data and format data. And put forward the requirement of a document signature.Forward-secure is a new requirement of digital signature, and it is even more important when signing a document for a document usually need to be put in pigeonhole. This paper uses some difficult mathematical problem like disperse logarithm and quadratic root hard problem to put forward a new forward-secure digital signature which need no superfluity storage. This signature scheme has a key's length like other common signatures, and it gives some proposal on how to use quadratic root hard problem to let key evolve in a forward-secure scheme, this paper use the signature scheme in the seal system and get the forward-secure in a signature for a document.When we seal a document , we transit other document into XML data and changes the document signature to a common data object data signature, XML-signature syntax and processing is a standard to sign some data object, we revise and add some element to satisfy the requirement of seal and forward-secure digital signature, the security of transformation is protected by signing the transformation of the program, and the property of the document is also reserved.At last, this paper uses some forward-secure document signature's XML signature scheme technic which we have introduce above, to establish a seal manage center , seal register organ which is PKI analog framework, and give a method of signature and validation. The message of seal embed into the digital watermark of seal picture , and use the seal picture as a symbol of signature of a document, the real signature data is also a part of the watermark in the picture; then compare the component of a electric seal system with the component of PKI, it considers implememt electric seal system on the fundamental of PKI, and let electric seal system become a part of PKI framework.