This section describes how to build a simple random event generator (REG) about the size of a bar of soap. It uses the RS232 serial port and streams random bits at 9600 baud. These are also commonly referred to random number generators or RNGs.
Why would you want one? Random numbers are a critical part of any modern encryption scheme; however, computers are deterministic in nature (i.e. 1 + 1 should always return 2) and require special hardware to act otherwise. This device is not only intended to fill that need but to do so in a way that is extremely difficult to attack and influence externally.