Serves as a tutorial to the development of different types of code systems and functions as a reference for the hobbyist, and any person or organization that requires the ability to obtain a low-cost, easy-to-use method to promote communications security.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.