The mathematics of ciphers : number theory and RSA cryptography / S.C. Coutinho. Números inteiros e criptografia RSA. English Coutinho, S. C. Number theory. Cryptography. QA241 .C69513 1999 512.7 21 COM Includes bibliographical references (p. 183-187) and index. Natick, Mass. : A K Peters, c1999. c1999. 1999 Text xv, 196 p. : eng eng por