00443nam a2200169 a 450000500170000002000150001708200150003210000180004724500450006525000110011026000310012130000310015249000390018363000160022263000180023863000170025620251203092029.0  a0387942939  a512.7bKOB  aKoblitz, Neal  aCourse in Number theory and cryptography  a2nd ed  aWashingtonbSpringerc1994  ax,235p.b20 cm. HBc20 cm.  aGraduate texts in Mathematicsd114  aMathematics  aNumber theory  aCryptography