Method encrypt

src/main/java/com/thealgorithms/ciphers/ECC.java:53–65

Encrypts the message using the public key. The message is transformed into an ECPoint and encrypted with elliptic curve operations. @param message The plain message to be encrypted @return The encrypted message as an array of ECPoints (R, S)

(String message)

     * @return The encrypted message as an array of ECPoints (R, S)
     */
    public ECPoint[] encrypt(String message) {
        BigInteger m = new BigInteger(message.getBytes()); // Convert message to BigInteger
        SecureRandom r = new SecureRandom(); // Generate random value for k
        BigInteger k = new BigInteger(curve.getFieldSize(), r); // Generate random scalar k

        // Calculate point r = k * G, where G is the base point
        ECPoint rPoint = basePoint.multiply(k, curve.getP(), curve.getA());

        // Calculate point s = k * publicKey + encodedMessage
        ECPoint sPoint = publicKey.multiply(k, curve.getP(), curve.getA()).add(curve.encodeMessage(m), curve.getP(), curve.getA());

        return new ECPoint[] {rPoint, sPoint}; // Return encrypted message as two ECPoints
    }

    /**
     * Decrypts the encrypted message using the private key.