  We shall review the cellular automaton(CA)-based pseudorandom-number
generators (PRNGs), and show that one of these PRNGs can generate high-quality
random numbers which can pass all of the statistical tests provided by the
National Institute of Standards and Technology (NIST). A CA is suitable for
hardware implementation. We demonstrate that the CA-based stream cipher, which
is implemented in the field-programmable gate arrays (FPGA), has a high
encryption speed in a real-time video encryption and decryption system.
