❞ ˝An absorbing tale of codemaking and codebreaking over the centuries.˝ --Scientific American . ❝

❞ ˝A good read that, bless it, makes the reader feel a bit smarter when it˝s done. Singh˝s an elegant writer and well-suited to the task of leading the mathematically perplexed through areas designed to be tricky.˝ --Seattle Weekly . ❝