Beginning Cryptography with Java - download pdf or read online

By David Hook

Humans will nonetheless wax lyrically approximately key sizes and PKI (Public Key Infrastructure), yet what does all of it suggest, and what does it suggest while you're utilizing Java? The Java APIs manage to pay for you loads of flexibility, and even supposing this may let you enforce an software utilizing cryptography at a basic point, it is going to additionally let you tie your self into a few negative knots. you could keep away from this for those who comprehend a number of principals concerning the means the APIs are prepare. additionally, through knowing the relationships among the high-level APIs and the extra basic ones, debugging turns into more uncomplicated and you may realize while it's not essential to construct issues from scratch, as, now and again, the exertions has already been performed. briefly, with the ideal realizing, it can save you your self loads of paintings. This ebook has been written with the purpose of delivering that realizing.

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Extra info for Beginning Cryptography with Java

Example text

They are used to secure bulk data, provide a foundation for message authentication codes, and provide support for passwordbased encryption as well. As symmetric key cryptography gains its security from keeping a shared key secret, it is also often referred to as secret key cryptography, a term that you will see is used in the JCE. This chapter introduces the concept of symmetric key cryptography and how it is used in the JCE. I will cover creation of keys for symmetric key ciphers, creating Cipher objects to be used for encryption, how modes and padding mechanisms are specified in Java, what other parameter objects can be used to initialize ciphers and what they mean, how password-based encryption is used, methods for doing key wrapping, and how to do cipher-based I/O.

Consequently that is all the API offers. toHex() so that only the generated bytes in the output arrays are printed. getOutputSize(). doFinal(). getOutputSize() will almost always be larger than the number of bytes produced by the cipher. If you do not take this into account, you will end up with spurious zeros at the end of your data. Other Padding Mechanisms A number of other padding modes are available. The following ones are available in the Bouncy Castle provider. If you are using another provider, you might find some or all of the following in addition to NoPadding and PKCS5Padding and/or PKCS7Padding: q ISO10126-2Padding.

It. toHex(plainText, ptLength) + " bytes: " + ptLength); } } Run this example and you will now see the following output: input : 000102030405060708090a0b0c0d0e0f0001020304050607 cipher: eb913126049ccdea00f2d86fda94a02fd72e0914fd361400d909f45f73058fc3 bytes: 32 plain : 000102030405060708090a0b0c0d0e0f0001020304050607 bytes: 24 As you can see, the ciphertext in the output has now changed substantially as a consequence of the change in IV. How It Works Looking at the code, there is only really one major change from the original CBC example: the creation of and handling of the IV.

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Beginning Cryptography with Java by David Hook

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