How AES Encryption Works | Working, Rounds & Security

AES (Advanced Encryption Standard) is the backbone of modern digital security. In this video, we explain AES encryption step by step, using a clear and beginner-friendly approach. You will learn how AES transforms plaintext into secure ciphertext through multiple rounds of substitution, permutation, mixing, and key addition. This video also explains why AES replaced DES and why it is trusted worldwide. 🔐 Topics covered in this video: What is AES (Advanced Encryption Standard)? Why AES was needed Symmetric key encryption explained AES block size and key lengths AES-128, AES-192, and AES-256 rounds AES State matrix AES encryption steps: SubBytes ShiftRows MixColumns AddRoundKey AES key expansion Why AES is secure Real-world applications of AES 🎯 Who should watch this video? Computer Science students Cybersecurity beginners Cryptography learners Exam preparation (GATE, NET, university exams) AES is trusted not because it is hidden, but because breaking it is practically impossible. 👍 If you found this video helpful, like, share, and subscribe for more cryptography and cybersecurity concepts explained simply.