Currently recommended key size for SSL certificates used in e-commerce is 2048 so that is what we use here. Initialize the KeyPairGenerator with the key size. Generating a Key Pairįirst step in creating an RSA Key Pair is to create a KeyPairGeneratorfrom a factory method by specifying the algorithm (“ RSA” in this instance): KeyPairGenerator kpg = KeyPairGenerator.getInstance('RSA') Public key cryptography can be used in two modes:Įncryption: Only the private key can decrypt the data encrypted with the public key.Īuthentication: Data encrypted with the private key can only be decrypted with the public key thus proving who the data came from. Distribute the public key to whoever needs it but safely secure the private key. Public key cryptography uses a pair of keys for encryption. You can use RSA keys pairs in public key cryptography. Java provides classes for the generation of RSA public and private key pairs with the package curity. Let us learn the basics of generating and using RSA keys in Java.
