Cryptography Extensions Practical Guide for Programmers by Jason R. Weiss

By Jason R. Weiss

For a very long time, there was a necessity for a pragmatic, down-to-earth builders booklet for the Java Cryptography Extension. i'm more than pleased to work out there's now a booklet which could solution some of the technical questions that builders, managers, and researchers have approximately one of these serious subject. i'm certain that this publication will give a contribution enormously to the luck of securing Java functions and deployments for e-business. --Anthony Nadalin, Java defense Lead Architect, IBMFor many Java builders and software program engineers, cryptography is an «on-demand» programming workout, the place cryptographic thoughts are shelved till the subsequent venture calls for renewed concentration. yet concerns for cryptography needs to be made early on within the layout strategy and its important that builders comprehend what varieties of strategies exist. one in all Javas suggestions to assist bridge the space among educational study and real-world challenge fixing is available in the shape of a well-defined structure for imposing cryptographic ideas. notwithstanding, to take advantage of the structure and its extensions, you will need to realize the professionals and cons of other cryptographic algorithms and to grasp how you can enforce numerous units like key agreements, electronic signatures, and message digests, to call a few.In Java Cryptography Extensions (JCE), cryptography is mentioned on the point that builders want to know to paintings with the JCE and with their very own purposes yet that doesnt crush through packing in info unimportant to the busy expert. The JCE is explored utilizing quite a few code examples and educational aspect, with basically provided sections on each one element of the Java library. an internet open-source cryptography toolkit and the code for all the examples extra reinforces the recommendations lined in the publication. No different source provides so concisely or successfully the precise fabric had to commence using the JCE. * Written by means of a pro veteran of either cryptography and server-side programming* Covers the structure of the JCE, symmetric ciphers, uneven ciphers, message digests, message authentication codes, electronic signatures, and coping with keys and certificate* incorporates a better half website that includes the code for the examples within the booklet, open-source cryptographic toolkits, and extra assets

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Cryptography Extensions Practical Guide for Programmers

For a very long time, there was a necessity for a pragmatic, down-to-earth builders ebook for the Java Cryptography Extension. i'm more than pleased to determine there's now a booklet which can solution the various technical questions that builders, managers, and researchers have approximately this sort of serious subject. i'm yes that this booklet will give a contribution vastly to the good fortune of securing Java functions and deployments for e-business.

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1: Architecture of a symmetric cipher. most of us would have a hard time remembering a large 20, 30, or 40 character random password. Overall, we have a tendency to pick secret keys (often referred to as passwords) that are short and easy to remember, secret god dev scott dba admin All of these are terrible examples of common passwords used in production systems. Symmetric ciphers play an important role in cryptography today. Symmetric ciphers are fast and capable of performing encryption operations even when the input data is very large.

6 JCA Helper Classes | } catch (NullPointerException nspe) { //NPE means Provider wasn't found! 0 is formally referred to as the 'SunJGSS' provider in a getlnstance() factory method Total Providers' 7 The c o m . m k p . j c e . m i s c . C r y p t o U t i l s class provided in the code examples offers a useful m e t h o d that makes it easy for y o u r applications to d e t e r m i n e if a specific provider is available. The signature looks like this: public final static boolean providerExists(String providerName); This helper method can be used to eliminate NoSuchProviderException risks at run time.

Ciphers requiring more than a byte array will be forced to use the engine method described in Option 1. // an array of bytes that represent your DES key //create a provider independent secret key for a DES cipher SecretKeySpec key = new SecretKeySpec(myKey, "DES") ; Close inspection of the SecretKeySpec class reveals that it implements the Key, KeySpec, SecretKey, and Serializable interfaces. That means that the result of this operation can be passed to any method expecting any one of the first three interfaces, and the result 40 Chapter 2: Working with Symmetric Ciphers 9 could be serialized for later use.

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