AES సెక్రెట్స్: ఆధునిక ఎన్‌క్రిప్షన్ అల్గోరిథమ్ తెలుగు వివరణ 🔐

CNS6 || AES ADVANCED ENCRYPTION STANDARDS ALGORITHM || EXPLAINED IN TELUGU #AES ALGORITHM

The Advanced Encryption Standard (AES) is a widely used symmetric key block cipher algorithm in cryptography. It is the successor of the DES algorithm and provides much stronger security.

✔️ Developed by: NIST (National Institute of Standards and Technology) in 2001
✔️ Type: Symmetric encryption (same key is used for encryption and decryption)
✔️ Block size: 128 bits
✔️ Key sizes: 128, 192, or 256 bits
✔️ Rounds:

10 rounds for 128-bit key

12 rounds for 192-bit key

14 rounds for 256-bit key


🔑 Steps in AES Algorithm

1. Key Expansion – Generate round keys from the cipher key.


2. Initial Round – AddRoundKey (XOR with the key).


3. Main Rounds (repeated 9/11/13 times depending on key size):

SubBytes (Byte substitution using S-box)

ShiftRows (Rows shifted cyclically)

MixColumns (Mixing of columns for diffusion)

AddRoundKey (XOR with round key)



4. Final Round (without MixColumns):

SubBytes → ShiftRows → AddRoundKey




⚡ Advantages

Strong security compared to DES and 3DES

Fast and efficient for both hardware and software

Used in SSL, VPN, wireless networks, and secure file transfer


🚫 Limitations

Symmetric: Both sender and receiver must share the same secret key

Key distribution is difficult in large networks