May 2001
Intermediate to advanced
1088 pages
30h 13m
English
Content preview from Special Edition Using Java™ 2 Enterprise EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Generating an Encryption Key
The JCE represents keys two different ways. First, there is a class called SecretKey that is an opaque version of the key. That is, although the SecretKey class represents a key, you don't have access to the individual bits in the key. The other representation is called a key specification. A key specification, or key spec, is represented by the SecretKeySpec class and by algorithm-specific subclasses such as DESKeySpec or PBEKeySpec.
The easiest way to generate a random key is just to use a KeyGenerator class. Use the getInstance method to get a key generator for the particular algorithm you want to use. For example, to generate a random key for DESede, you first call
KeyGenerator keyGen = KeyGenerator.getInstance("DESede"); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.