ARIA-128-CFB 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 ARIA-128-CFB algorithm is a symmetric key block cipher designed to provide secure data encryption. It operates with a fixed block size of 128 bits and a key length of 128 bits in this specific configuration. The algorithm belongs to the ARIA family, which uses substitution-permutation network structures to achieve high levels of security. The CFB mode, or Cipher Feedback mode, enables the algorithm to transform a block cipher into a stream cipher, allowing encryption of data in units smaller than the block size and providing error propagation characteristics suitable for certain communication protocols.
Key Schedule
The key schedule process in ARIA-128-CFB generates a series of round keys from the original 128-bit key. It uses predefined constants, XOR operations, and non-linear S-box substitutions to derive each round key. The design ensures that even small changes in the original key produce significant differences in the derived round keys, enhancing resistance to linear and differential cryptanalysis.
Encryption Process
Encryption in CFB mode begins with an initialization vector (IV) of the same block size. The IV is encrypted using the ARIA block cipher with the first round key. The output of this encryption is then XORed with the first plaintext segment to produce the corresponding ciphertext. Subsequent segments are processed by taking the previous ciphertext block, encrypting it with the block cipher, and XORing the result with the next plaintext segment. This feedback mechanism allows continuous encryption of data streams of arbitrary length while maintaining cryptographic integrity.
Decryption Process
Decryption in ARIA-128-CFB mirrors the encryption process. The ciphertext is XORed with the encrypted output of the previous ciphertext block or IV to recover the plaintext. Because CFB mode does not require separate decryption rounds, the same block cipher encryption function is applied, which simplifies implementation and reduces computational overhead. The algorithm preserves the order of bits and blocks, allowing secure recovery of the original data without modification.
Security Features
ARIA-128-CFB provides confidentiality through strong non-linear transformations, diffusion, and key-dependent substitution layers. The feedback mode ensures that identical plaintext blocks produce different ciphertext blocks when preceded by different IVs or ciphertext, reducing patterns and statistical vulnerabilities. The algorithm is resistant to common attacks such as ciphertext-only and known-plaintext attacks, given a properly chosen key and IV. The design adheres to international cryptographic standards and is suitable for both software and hardware implementations where secure data transmission is required.
Performance Characteristics
CFB mode enables ARIA-128 to efficiently process streaming data with minimal latency. Its design allows parallel key schedule precomputation while maintaining sequential encryption operations. Memory requirements are limited to storing the IV, key schedule, and current feedback block, making the algorithm suitable for constrained environments. Performance is dependent on block cipher throughput and the size of plaintext segments processed per operation, providing flexibility across different applications.