Method decrypt

src/main/java/com/thealgorithms/ciphers/ECC.java:74–84

Decrypts the encrypted message using the private key. The decryption process is the reverse of encryption, recovering the original message. @param encryptedMessage The encrypted message as an array of ECPoints (R, S) @return The decrypted plain message as a String

(ECPoint[] encryptedMessage)

     * @return The decrypted plain message as a String
     */
    public String decrypt(ECPoint[] encryptedMessage) {
        ECPoint rPoint = encryptedMessage[0]; // First part of ciphertext
        ECPoint sPoint = encryptedMessage[1]; // Second part of ciphertext

        // Perform decryption: s - r * privateKey
        ECPoint decodedMessage = sPoint.subtract(rPoint.multiply(privateKey, curve.getP(), curve.getA()), curve.getP(), curve.getA());

        BigInteger m = curve.decodeMessage(decodedMessage); // Decode the message from ECPoint

        return new String(m.toByteArray()); // Convert BigInteger back to String
    }

    /**
     * Generates a new public-private key pair for encryption and decryption.