Quantum Computing: Threats & Possible Remedies

Information Security is a buzz word today. Due to the emergence and recent developments of quantum computers, there is a possible threat on all present cryptographic methods. Researchers claim that once a powerful quantum computer comes into reality, the existing cryptosystems such as RSA, AES etc will be in trouble. So we must start developing post quantum or quantum secure cryptographic methods because changing the existing cryptosystems by quantum secure methods will be a very slow and rigorous task. So keeping this agenda in mind, in this paper, we discuss quantum computing, existing cryptosystems and possible post quantum methods in brief so that the readers of this paper can develop a clear idea about it for their future work.