May 2001
Intermediate to advanced
618 pages
20h 50m
English
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Summary
The digital signatures we’ve examined in this chapter form a
key piece of the Java security architecture since they are the
mechanism by which the parameters of the Java security sandbox can be
extended: a digital signature gives the user the assurance that
particular Java classes were provided by known entities. The user is
then free to adopt a security policy for those classes based on the
user’s assessment of the trustworthiness of the entity that
provided the classes. Digital signatures have many other uses, of
course, and in conjunction with the SignedObject
class they allow you to send and verify arbitrary pieces of data.
The digital signature engine is interesting also because it requires the use of the other engines we’ve looked at in earlier chapters -- the message digest engine to generate the fingerprint of the data that the digital signature will sign and the key pair engine (and its related classes) to provide the necessary keys to feed into this engine.
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