The books deals with simplified C programs of the commonly known ciphers and algorithms . Though all the ciphers can already been found in different books with codes in C, the author has tried to write simplified codes for the ciphers given, so as to make the subject more interesting and easy to the readers. The readers are asked to follow any standard book for the theoretical discussions of the ciphers & algorithms as no theoretical discussions have been included in the book. Again, all the topics given and discussed in this book have already been published in different books in different ways . The main objective of this book is to give the readers an easy understanding about the topics given for the benefit of their clear concept. Any suggestion for the improvement of the book is most welcomed.