A review of some recent stream ciphers

In this paper, few stream ciphers proposed in e-stream are reviewed. They are evaluated regarding the hardware requirements, strengths and weaknesses. Detailed information about initialization, Key schedule and actual cipher stream generation are discussed in detail for the e-stream ciphers Trivium, Polar Bear, Decim, Mickey, Grain and NLS ciphers. A comparison is presented to highlight the advantages of each of these and attacks described in literature.