Cryptography Questions Medium
The Electronic Codebook with Cipher Block Chaining, Output Feedback, and Cipher Feedback (ECB-CBC-OFB-CFB) mode is a combination of different encryption modes used in cryptography.
1. Electronic Codebook (ECB): In ECB mode, each block of plaintext is encrypted independently using the same key. This mode is simple and efficient but lacks security as identical plaintext blocks will result in identical ciphertext blocks.
2. Cipher Block Chaining (CBC): In CBC mode, each plaintext block is XORed with the previous ciphertext block before encryption. This introduces dependency between blocks, making it more secure than ECB. Initialization Vector (IV) is used to start the chaining process.
3. Output Feedback (OFB): In OFB mode, a feedback mechanism is used to generate a keystream, which is then XORed with the plaintext to produce the ciphertext. The same keystream is generated for each block, making it suitable for streaming data.
4. Cipher Feedback (CFB): In CFB mode, the previous ciphertext block is encrypted and then XORed with the plaintext to produce the ciphertext. This mode allows encryption of individual bits or bytes and is suitable for streaming data.
The ECB-CBC-OFB-CFB mode combines these different modes to provide a more secure and versatile encryption scheme. It leverages the strengths of each mode to enhance security and accommodate different types of data.