AES-128-OFB ENCRYPTION TOOL

Other Crypto Algorithms

AES-128-CBC AES-128-CBC-CTS AES-128-CBC-HMAC-SHA1 AES-128-CBC-HMAC-SHA256 AES-128-CCM AES-128-CFB AES-128-CFB1 AES-128-CFB8 AES-128-CTR AES-128-ECB AES-128-GCM AES-128-GCM-SIV AES-128-OCB AES-128-OFB AES-128-SIV AES-128-WRAP AES-128-WRAP-INV AES-128-WRAP-PAD AES-128-WRAP-PAD-INV AES-128-XTS AES-192-CBC AES-192-CBC-CTS AES-192-CCM AES-192-CFB AES-192-CFB1 AES-192-CFB8 AES-192-CTR AES-192-ECB AES-192-GCM AES-192-GCM-SIV AES-192-OCB AES-192-OFB AES-192-SIV AES-192-WRAP AES-192-WRAP-INV AES-192-WRAP-PAD AES-192-WRAP-PAD-INV AES-256-CBC AES-256-CBC-CTS AES-256-CBC-HMAC-SHA1 AES-256-CBC-HMAC-SHA256 AES-256-CCM AES-256-CFB AES-256-CFB1 AES-256-CFB8 AES-256-CTR AES-256-ECB AES-256-GCM AES-256-GCM-SIV AES-256-OCB AES-256-OFB AES-256-SIV AES-256-WRAP AES-256-WRAP-INV AES-256-WRAP-PAD AES-256-WRAP-PAD-INV AES-256-XTS ARIA-128-CBC ARIA-128-CCM ARIA-128-CFB ARIA-128-CFB1 ARIA-128-CFB8 ARIA-128-CTR ARIA-128-ECB ARIA-128-GCM ARIA-128-OFB ARIA-192-CBC ARIA-192-CCM ARIA-192-CFB ARIA-192-CFB1 ARIA-192-CFB8 ARIA-192-CTR ARIA-192-ECB ARIA-192-GCM ARIA-192-OFB ARIA-256-CBC ARIA-256-CCM ARIA-256-CFB ARIA-256-CFB1 ARIA-256-CFB8 ARIA-256-CTR ARIA-256-ECB ARIA-256-GCM ARIA-256-OFB CAMELLIA-128-CBC CAMELLIA-128-CBC-CTS CAMELLIA-128-CFB CAMELLIA-128-CFB1 CAMELLIA-128-CFB8 CAMELLIA-128-CTR CAMELLIA-128-ECB CAMELLIA-128-OFB CAMELLIA-192-CBC CAMELLIA-192-CBC-CTS CAMELLIA-192-CFB CAMELLIA-192-CFB1 CAMELLIA-192-CFB8 CAMELLIA-192-CTR CAMELLIA-192-ECB CAMELLIA-192-OFB CAMELLIA-256-CBC CAMELLIA-256-CBC-CTS CAMELLIA-256-CFB CAMELLIA-256-CFB1 CAMELLIA-256-CFB8 CAMELLIA-256-CTR CAMELLIA-256-ECB CAMELLIA-256-OFB CHACHA20 CHACHA20-POLY1305 DES-EDE-CBC DES-EDE-CFB DES-EDE-ECB DES-EDE-OFB DES-EDE3-CBC DES-EDE3-CFB DES-EDE3-CFB1 DES-EDE3-CFB8 DES-EDE3-ECB DES-EDE3-OFB DES3-WRAP

The AES-128-OFB algorithm is a symmetric key encryption method based on the Advanced Encryption Standard (AES) with a 128-bit key length operating in Output Feedback (OFB) mode. AES is a block cipher standardized by NIST and widely used for secure data transmission. The OFB mode converts the block cipher into a synchronous stream cipher, allowing encryption and decryption of data streams of arbitrary length without requiring padding.

Key Features

Key Size: 128 bits, providing a balance between security and computational efficiency.
Block Size: 128 bits, consistent with AES specifications.
Mode: Output Feedback (OFB), which generates keystream blocks independently of plaintext, enhancing error tolerance.

Encryption Process

Initialization: A 128-bit secret key and an initialization vector (IV) of equal length are required. The IV ensures that identical plaintext blocks produce distinct ciphertext blocks across different sessions.
Keystream Generation: The AES block cipher encrypts the IV to generate the first keystream block. Subsequent keystream blocks are produced by repeatedly encrypting the previous keystream block using the same AES key.
Data Encryption: Each plaintext block is XORed with the corresponding keystream block to produce the ciphertext. This process allows for parallel processing and can handle data streams of any size.

Decryption Process

Decryption mirrors the encryption process. The same key and IV are used to regenerate the identical keystream. Each ciphertext block is XORed with its corresponding keystream block to recover the original plaintext without additional transformations. The OFB mode ensures that errors in one block affect only the corresponding plaintext block, maintaining error isolation.

Security Considerations

Proper IV management is critical; reusing an IV with the same key can compromise security by allowing attackers to detect plaintext patterns.
The algorithm is resistant to known plaintext and ciphertext-only attacks when used with a securely generated IV.
OFB mode does not propagate errors beyond a single block, making it suitable for unreliable communication channels.

Applications

AES-128-OFB is used in secure communication protocols, data encryption for storage, and scenarios requiring stream encryption with strong error tolerance. Its structure supports real-time encryption of continuous data streams and is implemented in various software and hardware cryptographic modules compliant with modern security standards.

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