Java Security by Scott Oaks Here are the changes made in the 11/00 reprint: Here's a key to the markup: [page-number]: major technical error or updated material {page-number}: minor technical error : important language or formatting problem (page-number): minor formatting problem, or language change ?page-number?: question or request for clarification (Chapter 7) In the last paragraph of the section entitled "Digital Signatures": "However, just because someone can snoop the signed data does not mean that it can be tampered with -- if the data is altered, then it will not produce the same message digest, which in turn will not produce the same digital signature." has been changed to: "However, just because someone can snoop the signed data does not mean that it can be effectively tampered with. Changing the data will change the message digest (given the mathematical constraints we discussed earlier), which invalidates the digital signature."