04. Java Cryptography

You can decrypt the encrypted data using the Cipher class of the javax.crypto package. Follow the steps given below to decrypt given data using Java. Step 1: Create a KeyPairGenerator object The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys. Create KeyPairGenerator object using the getInstance() method as shown below. […]

You can encrypt given data using the Cipher class of the javax.crypto package. Follow the steps given below to encrypt given data using Java. Step 1: Create a KeyPairGenerator object The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys. Create KeyPairGenerator object using the getInstance() method as shown below. Step […]

You can create digital signature using Java and verify it following the steps given below. Step 1: Create a KeyPairGenerator object The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys. Create KeyPairGenerator object using the getInstance() method as shown below. Step 2: Initialize the KeyPairGenerator object The KeyPairGenerator class provides […]

Digital signatures allow us to verify the author, date and time of signatures, authenticate the message contents. It also includes authentication function for additional capabilities. Advantages of digital signature In this section, we will learn about the different reasons that call for the use of digital signature. There are several reasons to implement digital signatures […]

Java provides the KeyPairGenerator class. This class is used to generate pairs of public and private keys. To generate keys using the KeyPairGenerator class, follow the steps given below. Step 1: Create a KeyPairGenerator object The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys. Create KeyPairGenerator object using the getInstance() method as […]

Java provides KeyGenerator class this class is used to generate secret keys and objects of this class are reusable. To generate keys using the KeyGenerator class follow the steps given below. Step 1: Create a KeyGenerator object The KeyGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyGenerator object that generates secret […]

In this chapter, we will learn how to retrieve a key from the keystore using Java Cryptography. To retrieve a key from the keystore, follow the steps given below. Step 1: Create a KeyStore object The getInstance() method of the KeyStore class of the java.security package accepts a string value representing the type of the keystore and returns a KeyStore object. […]

The Keys and certificates used/generated are stored in a data base called as keystore. By default this database is stored in a file named .keystore. You can access the contents of this database using the KeyStore class of the java.security package. This manages three different entries namely, PrivateKeyEntry, SecretKeyEntry, TrustedCertificateEntry. Storing a Key in keystore In this section, we will […]

A cryptosystem is an implementation of cryptographic techniques and their accompanying infrastructure to provide information security services. A cryptosystem is also referred to as a cipher system. The various components of a basic cryptosystem are Plaintext, Encryption Algorithm, Ciphertext, Decryption Algorithm, Encryption Key and, Decryption Key. Where, Fundamentally there are two types of keys/cryptosystems based on the type […]

MAC (Message Authentication Code) algorithm is a symmetric key cryptographic technique to provide message authentication. For establishing MAC process, the sender and receiver share a symmetric key K. Essentially, a MAC is an encrypted checksum generated on the underlying message that is sent along with a message to ensure message authentication. The process of using MAC for […]