Old books available in (English)

It’s book deals with chemistry concepts for NEET which is published by Arihant, and Dr. RK Gupta is the author

*Cryptography and Network Security* by William Stallings is a comprehensive textbook that provides an in-depth introduction to the fields of cryptography and network security. The book covers a wide range of topics essential for understanding secure communications, including classical encryption techniques, public-key cryptography, cryptographic protocols, and the application of cryptography in network security. The text is divided into several key sections, focusing on foundational principles, algorithms, and protocols for securing networks.

Related to defence

Physics for class 11