Diffie- Hellman Key Exchange between 2 Parties * Copyright (c) 1997, 2001, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Oracle nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS * IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FO ARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ( INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. import java.io. import java.math. Big Integer; import java.security. import java.security.spec. import java.security.interfaces. import javax.crypto. import javax.crypto.spec. import javax.crypto.interfaces. import com.sun.crypto.provider. Sun JCE; * This program executes the Diffie- Hellman.
In today's wired world, securing data from loss or theft is a top priority for companies that want to stay out of the headlines. Data encryption is a valuable tool for protecting a company's most valuable asset: customer data. Here, you will learn about cryptography and using the Java Cryptography Extension ( JCE) to provide the security needed to protect that data. What Is Cryptography? Before getting started with Java cryptography, it is helpful to have a basic understanding of what cryptography is. At its most basic level, cryptography is a means of taking human-readable information, called plaintext, performing an encryption algorithm called a cipher on the plaintext, and producing encoded output, called ciphertext, that cannot easily be interpreted. Decryption is the reverse process of taking the ciphertext and converting it back into plaintext. To do this, both participants in this process need to know what cipher algorithm is being used and must have access to a key, which is a unique value that is applied to the cipher to produce ciphertext or plaintext, depending on whether one is encrypting or decrypting. The key can be private, meaning that both parties agree on the key value ahead of time, or can derive it somehow by computation. This is known as key agreement. A key also can be public, meaning that the sending party publishes the key along with the data. When a public key is used, the recipient of the data receives a private key that was also generated at encryption time separately and uses this value to decrypt the data. Email Article Print Article A password is an example of a private key. The parties exchanging data agree on the password ahead of time, and the sender encrypts the data based on the password. When the receiver decrypts the data, he enters the password, which is then applied to the cipher to obtain the plaintext version. This is not.
The Java Cryptography Extension ( JCE) is an officially released Standard Extension to the Java Platform and part of Java Cryptography Architecture. JCE provides a framework and implementation for encryption, key generation and key agreement, and Message Authentication Code ( MAC) algorithms. JCE supplements the Java platform, which already includes interfaces and implementations of message digests and digital signatures. Installation is specific to the version of the Java Platform being used, with downloads available for Java 6, Java 7, and Java 8. External links[edit] Java Cryptography Architecture ( JCA) Reference Guide Retrieved from Categories: Java APIs.
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