  Leveraging quantum mechanics, cryptographers have devised provably secure key
sharing protocols. Despite proving the security in theory, real-world
application falls short of the ideal. Last year, cryptanalysts completed an
experiment demonstrating a successful eavesdropping attack on commercial
quantum key distribution (QKD) systems. This attack exploits a weakness in the
typical real-world implementation of quantum cryptosystems. Cryptanalysts have
successfully attacked several protocols. In this paper, we examine the Kak
quantum cryptography protocol and how it may perform under such attacks.
