The book consists of seven chapters out of which aspects of cryptosystems, synopsis of neural cryptosystem and security issues discussed in chapters are defined at the begining. Different factors in evaluating various techniques along with structure of keys are also prescribed. Second chapter of the book deals with Artificial Neural Network and its various models, training of ANN along its various principles in security aspects are prescribed. Neural network guided secret key based cryptographic technique through chaining mechanism has been presented in chapter three. S-box operation based on detection of prime non prime detection has also been illustrated. Chapter four described ANN based random block length based cryptosystem for communication through wireless networks. Discussion has been done on format of key structure applied on various techniques. Results obtained through implementation of the proposed techniques are discussed and compared with different existing techniques. All of these features makes this book ideal for Artificial Neural Network based cryptosystem and related applications. Practicing technologists would also find this book to be a valuable reference.