2. A method according to claim 1 , further comprising: identifying at least one attribute of the multiple statements; and using the digital processor to digitally sign a value dependent upon both of the aggregate hash value and the attribute.
2. A method according to claim 1 , further comprising: identifying at least one attribute of the multiple statements; and using the digital processor to digitally sign a value dependent upon both of the aggregate hash value and the attribute. 3. A method according to claim 2 , wherein said method further comprises: identifying as an attribute the number of statements that have been hashed and that are represented by the aggregate hash value; and digitally signing a value dependent upon both of the aggregate hash value and the number of statements represented by the aggregate hash value.