ARIA-256-CFB1 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 ARIA-256-CFB1 algorithm is a symmetric key block cipher operating in Cipher Feedback Mode with 1-bit feedback, designed for secure data encryption and decryption. ARIA itself is a Korean standard block cipher developed to provide robust security through substitution-permutation network structures and efficient processing on software and hardware platforms. In the 256-bit variant, the algorithm uses a 256-bit key, allowing for enhanced resistance against brute-force attacks.

Key Features

Block Size: 128 bits
Key Size: 256 bits
Mode of Operation: CFB1 (1-bit Cipher Feedback Mode)
Rounds: 16 rounds of substitution and permutation
Security: Provides high resistance to differential and linear cryptanalysis

Algorithm Structure

ARIA-256 employs a substitution-permutation network (SPN) structure. Each round consists of several layers:

Substitution Layer (S-Box): Non-linear byte substitution using predefined substitution boxes to introduce confusion.
Diffusion Layer (P-Box): Linear transformations spread input bits across the output, enhancing diffusion.
Key Addition Layer: XOR operations with round keys derived from the main 256-bit key, ensuring that each round output depends on the key.

CFB1 Mode Operation

In CFB1 mode, the algorithm encrypts data at the bit level. The most significant bit of the previous ciphertext block is fed back to the encryption function, generating a keystream bit. This keystream bit is then XORed with the plaintext bit to produce the ciphertext bit. The process repeats for each bit, enabling secure stream-like encryption while maintaining block cipher properties.

Key Schedule

The 256-bit key undergoes a key expansion process to produce round keys for all 16 rounds. This expansion uses multiple diffusion and substitution steps to generate keys that are independent, reducing the risk of related-key attacks. Each round key is applied sequentially during the encryption and decryption processes.

Encryption and Decryption Process

Encryption begins with an initial key mixing and progresses through 16 SPN rounds, incorporating the feedback from previous bits in CFB1 mode. Decryption reverses the XOR operation with the keystream, reconstructing the original plaintext bit-by-bit. This mode allows encryption of arbitrary-length data without the need for padding, making it suitable for real-time secure communication.

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