Transfer of large, bursty files has been made possible by the advancement of technology in ultrafast optical TDM networks. Such transfers require ultrafast encryption using pseudorandom key streams. However, the implementation of logic at 100 Gbps rate, whether it is electronic or optical, is often limited in scope and extremely expensive. In this talk, we will review the various traditional approaches of generating complex pseudorandom sequences and discuss their limitations in ultrafast networks. We propose a new sequence generator, based on both optical logic and electronic Feedback Shift Registers, that generates sequences at optical rates. We will show that the complexity of the sequence depends on that of the electronic controller.

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