CAMELLIA-256-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-WRAPThe Camellia-256-OFB algorithm is a symmetric key block cipher operating in Output Feedback (OFB) mode, which transforms the block cipher into a synchronous stream cipher. It uses a 256-bit key to encrypt and decrypt data, providing a high level of security suitable for modern cryptographic applications. The OFB mode allows the generation of a keystream independent of plaintext and ciphertext, enhancing error propagation resistance.
Key Features
- Block Size: 128 bits
- Key Size: 256 bits
- Mode: Output Feedback (OFB)
- Type: Symmetric key block cipher
- Security: Resistant to differential and linear cryptanalysis
Algorithm Structure
The core of Camellia-256 consists of 14 rounds of Feistel-type transformations. Each round involves substitution using four 8×8 S-boxes, P-function linear transformations, and key mixing. The algorithm includes initial and final key whitening steps, which XOR parts of the input and output with subkeys derived from the main 256-bit key.
Key Schedule
Camellia-256 generates subkeys for each round through a key schedule based on rotations, XOR operations, and application of the F-function. The schedule ensures that all rounds receive unique round keys while maintaining a strong correlation with the original key to prevent weak key vulnerabilities.
OFB Mode Operation
In OFB mode, an initial vector (IV) is encrypted with the block cipher to produce a keystream block. This keystream is then XORed with plaintext to produce ciphertext. The same keystream is used for decryption, XORing it with ciphertext to recover the original plaintext. OFB mode prevents error propagation; a single-bit error in ciphertext affects only the corresponding plaintext bit.
Implementation Considerations
When implementing Camellia-256-OFB, it is crucial to use a unique and unpredictable IV for each encryption operation. Proper key management and secure storage of keys and IVs are essential to maintain cryptographic strength. The algorithm is efficient on both hardware and software platforms due to its simple round functions and minimal memory requirements.