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Public key cryptosystem is a way that is used a secret communication between the sender and receiver, without needing for a secret key exchange and it can used for create a digital signature. Public key cryptosystem is a widely used technology around the world, which enables information to be transmission in a secret channel on the Internet. An encryption process is the process that used to obtain ciphertext C from original message P using public key e. While, in reverse, the decryption process is obtained original message P by decryption the ciphertext C using private key d. In fact, the encryption of P is relatively easy, since the plaintext P and public key e are known publically.
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