An Approach for XML Data Decomposition with Integrity Checking in XML Multisignature Scheme

XML multisignature schemes support more than one signer to sign different portions within an XML document. Therefore, how to decompose XML data is a big problem. Two issues should be considered in XML data decomposition. First, each subdocument divided is meaningful. Second, a integrity checking mechanism should be provided to ensure the integrity of each subdocument. The paper utilizes XPath expression to transform XML data, and generates an XML data integrity-checking pool to provide integrity-checking for decomposed XML data. Using XPath expression, it is easy to decompose an XML document while keeping the subdocument meaningful. With integrity-checking pool proposed, a signer can check integrity without cooperation from other signers. XML data does not need to be delegated entirely, and signers can complete integrity verification off-line.