# CBC, GCM, ECB, CFB

Sure! Here are some commonly used acronyms in cybersecurity along with brief explanations:

1. **CBC (Cipher Block Chaining)**:
   * A mode of operation for block ciphers. In CBC, each block of plaintext is XORed with the previous ciphertext block before being encrypted, ensuring that identical plaintext blocks produce different ciphertext blocks. This mode requires an initialization vector (IV) to start the process.
2. **GCM (Galois/Counter Mode)**:
   * A mode of operation for block ciphers that combines the Counter (CTR) mode for encryption with the Galois mode of authentication. GCM provides both data authenticity (integrity) and confidentiality. It's widely used in network security protocols like TLS.
3. **ECB (Electronic Codebook)**:
   * A simple mode of operation for block ciphers. In ECB, each block of plaintext is encrypted independently with the same key. This simplicity makes it insecure for many purposes because identical plaintext blocks result in identical ciphertext blocks, revealing patterns.
4. **CFB (Cipher Feedback)**:
   * A mode of operation for block ciphers that allows encryption of plaintext in segments smaller than the block size. In CFB, the previous ciphertext block is encrypted and then XORed with the current plaintext block to produce the current ciphertext block. It allows data to be processed in real-time.

If you need more detailed information or have any other questions, feel free to ask!
