<div id="noscript-padding"></div> current community chat blog Cryptography Cryptography Meta Sign up or log in to customize your list. more stack exchange communities Stack Exchange sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site Cryptography beta Questions Tags Tour Users Ask Question googleoff: all Take the 2-minute tour × Cryptography Stack Exchange is a question and answer site for software developers, mathematicians and others interested in cryptography. It's 100% free, no registration required. googleon: all Theoretical pi-based stream cipher up vote 3 down vote favorite Let's pretend that all digits of pi are k...