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How to Generate Key Using RSA in Java ?

Generate Key Using RSA in Java

Condition for Generate Key Using RSA in Java

  • Description:
    RSA key generation involves creating a pair of keys, a public key for encryption and a private key for decryption. The process begins by selecting two large prime numbers, which are then used to calculate the modulus and the public and private exponents. The public key consists of the modulus and the public exponent, while the private key consists of the modulus and the private exponent. The key generation process also involves calculating the totient of the modulus and ensuring that the private exponent is kept confidential.
    The security of RSA is based on the difficulty of factoring the large modulus, which is a product of the two primes. Typically, RSA key sizes range from 1024 to 4096 bits, with larger key sizes providing more security but requiring more computational power. The key pair can be used for both encryption and digital signature verification.
Sample Code
  • package cyberSecurity;
    import java.security.KeyPair;
    import java.security.KeyPairGenerator;
    import java.security.PrivateKey;
    import java.security.PublicKey;
    import java.security.SecureRandom;
    import java.util.Base64;
    public class CyberSecuritySamples {
    public static KeyPair generateRSAKeyPair(int keySize) throws Exception {
    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
    keyPairGenerator.initialize(keySize, new SecureRandom());
    return keyPairGenerator.generateKeyPair();
    }
    public static void main(String[] args) {
    try {
    KeyPair keyPair = generateRSAKeyPair(2048);
    PublicKey publicKey = keyPair.getPublic();
    PrivateKey privateKey = keyPair.getPrivate();
    System.out.println("Public Key (Base64): " +
    Base64.getEncoder().encodeToString(publicKey.getEncoded()));
    System.out.println("Private Key (Base64): " +
    Base64.getEncoder().encodeToString(privateKey.getEncoded()));
    } catch (Exception e) {
    System.out.println(e.getMessage());
    }
    }
    }
ScreenShots
  • Generate Key Using RSA