diff --git a/README.md b/README.md
index fadd94d..752b8a8 100644
--- a/README.md
+++ b/README.md
@@ -958,7 +958,7 @@ _________________
 - [Public and Private Keys - Signatures & Key Exchanges - Cryptography - Practical TLS](https://youtu.be/_zyKvPvh808)
 - [Understanding AES Encryption Mechanics: BMPS](https://youtu.be/OnhtzFJW_4I)
 - [💎 Understanding Cryptography: A Textbook for Students and Practitioners -  Christof Paar, Jan Pelzl](https://link.springer.com/book/10.1007/978-3-642-04101-3)
-- [Cryptography and Network Security: Principles and Practice - William Stallings](https://www.pearson.com/en-us/subject-catalog/p/cryptography-and-network-security-principles-and-practice/P200000003477/9780135764213)
+- [💎 Handbook of Applied Cryptography -  Alfred J. Menezes, Paul C. van Oorschot, Scott A. Vanstone](https://cacr.uwaterloo.ca/hac/)
 - [Serious Cryptography: A Practical Introduction to Modern Encryption - Jean-Philippe Aumasson](https://nostarch.com/seriouscrypto)
 - [MOOC - Security Part2: Basics of cryptography (YouTube Playlist)](https://youtube.com/playlist?list=PLnMKNibPkDnFSFh57UFTZLpy-7lZiwTHh)
 - [MOOC - Security Part3 : STM32 security features (YouTube Playlist)](https://youtube.com/playlist?list=PLnMKNibPkDnFzux3PHKUEi14ftDn9Cbm7)