3 public-domain matches

Modern Cryptography

Cover of Modern Cryptography Volume 1

Modern Cryptography Volume 1

Zhiyong Zheng

Cover of Mathematical recreations and problems of past and present times

Mathematical recreations and problems of past and present times

W. W. Rouse Ball, H. S. M. Coxeter

A Few Words on Secret Writing

A Few Words on Secret Writing

Edgar Allan Poe