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AES-128-CFB8 ENCRYPTION TOOL

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The AES-128-CFB8 algorithm is a symmetric key block cipher that operates using a 128-bit key and implements the Cipher Feedback (CFB) mode with 8-bit feedback. It combines the standardized AES block cipher with a stream cipher mode, enabling encryption of data in units smaller than the standard 128-bit block size. This mode allows for byte-level encryption and decryption while maintaining the security characteristics of AES.

Key Features

  • Key Size: 128 bits
  • Block Size: 128 bits
  • Feedback Size: 8 bits
  • Mode: Cipher Feedback (CFB)
  • Type: Symmetric encryption

Operational Principle

The AES-128-CFB8 algorithm starts by initializing a 128-bit initialization vector (IV) and a 128-bit key. The IV is combined with the plaintext in an XOR operation to produce the ciphertext. Unlike other AES modes, the CFB8 mode processes one byte at a time. Each byte of plaintext is XORed with the first byte of the encrypted shift register. After processing, the shift register is updated by shifting left by one byte and inserting the newly produced ciphertext byte. This ensures continuous feedback and chaining between subsequent bytes, maintaining confidentiality across the entire message.

Encryption Process

  1. Initialize the 128-bit key and 128-bit IV.
  2. Encrypt the current shift register using AES-128.
  3. XOR the first byte of the encrypted register with the plaintext byte to produce the ciphertext byte.
  4. Update the shift register by discarding the oldest byte and appending the ciphertext byte at the end.
  5. Repeat steps 2–4 for each subsequent plaintext byte.

Decryption Process

Decryption mirrors the encryption process. The ciphertext byte is XORed with the AES-encrypted shift register to recover the original plaintext byte. The shift register is then updated using the ciphertext byte, maintaining synchronization with the encryption process. This ensures correct decryption of each byte and preserves the order and integrity of the original message.

Security Considerations

The AES-128-CFB8 mode inherits the security properties of AES-128, including resistance to brute-force attacks against the key. The use of an IV ensures that identical plaintext blocks produce different ciphertext sequences. Care must be taken to never reuse the same IV with the same key to prevent compromise of confidentiality. Proper key management and random IV generation are critical to maintaining the security of the AES-128-CFB8 encryption.

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