The quantum Cryptography is a latter – day appliance in physics and information security, which employs the design of protocols to availing from quantum mechanics externals to assuredness the security of key distribution. In equivalent terms, the quantum key distribution (QKD) is secure because of the no-cloning theorem of quantum mechanics: Eve cannot duplicate the signal and forward a perfect copy to Bob. In this work, we define a new class of (QKD) protocols that are robust against any attacks. In this kind of cryptography, and analysis two protocols, Bennett – Brassard Protocol (B84) and the quantum cryptographic communication protocol (B92).