java cryptography architeacture seminar ppt | Cryptography | Key ...

JAVA CRYPTOGRAPHY ARCHITECTURE 1

Submitted by:- Mohit Agarwal 06cse030

CRYPTOGRAPHY 

Hidden writing

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Used to protect information

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Can ensure confidentiality

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Integrity and Authenticity too

cont..

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Cryptography -: to achieve encoding messages to make them no-readable.

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Cryptanalysis-: technique of decode no-readable into readable.

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Cryptology-: combination of cryptography and cryptanalysis.

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BASIC CRYPTOGRAPHIC FUNCTIONS Private/Public Key Pair Generation  Secret Key Generation  Hash Functions  Digital Signatures  Random Number Generation  Encryption/Decryption 

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SECRET, PUBLIC KEY CRYPTOGRAPHY AND HASH FUNCTIONS Secret Key Cryptography (SKC): Uses a single key for both encryption and decryption  Public Key Cryptography (PKC): Uses one key for encryption and another for decryption  Hash Functions: Uses a mathematical transformation to irreversibly "encrypt" information 

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ADVANTAGES OF JAVA IN CRYPTOGRAPHY

Develop programs more quickly  Avoid platform dependencies  Write once, run anywhere  Distribute software more easily 

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JAVA CRYPTOGRAPHIC TWO MAIN TECHNOLOGIES-

Java Cryptographic Architecture (JCA) - It is a set of classes that provide cryptographic capabilities to java programs.  Java cryptographic Extension (JCE)- Whereas JCE is not the part of core Java JDK. For this request special licensing. 

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JAVA CRYPTOGRAPHIC ARCHITECTURE JCA is the part of core java framework.  Security API in JDK 1.1 introduced the JCA.  It’s provide the basic cryptographic functionalities to programmer using java language.  Cryptographic functionalities such as- access control, permissions, key pairs, message digests and digital signatures.  In order to achieve this, the JCA package consists of a number of classes, called as engine classes. 

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ENGINE CLASSES It is a logical representation of cryptographic functionality.  Such as:Message digest Digital signature Key generator Random number 

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ENGINE CLASS

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TYPES OF ENGINE CLASSES

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SIGNATURE CLASS public abstract class Signature extends SignatureSpi  Used to provide applications the functionality of a digital signature algorithm  Provides implementation independent algorithms  There are two ways to request a signature algorithm object:

 Specifying

an algorithm name  Specifying both algorithm name and package provider

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DIGITAL SIGNATURE Public key cryptography is also used to provide digital signatures. plaintext

signing

signed message

private key signed message

verification plaintext public key

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KEYSTORE Manage secret keys, key pairs and digital certificates  A password-protected database 

 stores

private key and its associated public key certificate  Can contain trusted certificates  Each entry is identified by an alias 

An alias may identify the purpose of the key. i.e. signMyEmails

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MESSAGE DIGEST public abstract class MessageDigest extends MessageDigestSpi Also known as “hash function” or “one-way transformation”. Transforms a message of any length and computes a fixed length string. We want it to be hard to guess what the message was given only the digest.  Guessing

is always possible.

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MESSAGE DIGEST

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ENCRYPTING DATA 

This class is called as Cipher class  Javax.cryptro.Cipher

It provides an interface to encrypt and decrypt data either in arrays within the program or as that data is read or written through Java’s stream interfaces

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ENCRYPTION Encryption is the process of feeding plaintext and key into a function and getting ciphertext output  Ciphertext is “garbage” unless decrypted 

Plaintext Encryption Function

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DECRYPTION 

Decryption is the process of feeding ciphertext and a key into another function and getting original plaintext output

Decryption Function

Plaintext

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RANDOM NUMBER GENERATOR 

It is used to create cryptographic keys and in some cases to encrypt or sign data.

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Its value could not be predicted

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PRNG(Pseudo Random Number Generator) is used by computers to generate endless sequence of random numbers

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REFERENCE

www.google.com  www.wikipedia.org  www.scribd.com  http://www.oreilly.com/catalog/javacrypt/chapter/ch06. 

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THANK YOU!!!!!

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Q/A 26