ARIA-128-CTR 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-128-CTR algorithm is a symmetric key block cipher operating in counter (CTR) mode, designed to provide secure and efficient encryption for data streams. ARIA is a substitution-permutation network (SPN) based cipher that supports three key sizes: 128, 192, and 256 bits. In the 128-bit configuration, the key length is fixed at 128 bits, and the block size is also 128 bits. The CTR mode transforms the block cipher into a stream cipher by combining a nonce and a counter value, which is encrypted with the ARIA key to produce a keystream block. This keystream block is then XORed with the plaintext to generate the ciphertext, and similarly, the same process is used for decryption.

Key Expansion

The algorithm begins with a key schedule that expands the 128-bit input key into a set of round keys. This expansion process involves a series of non-linear substitutions using S-boxes and linear diffusion transformations. The resulting round keys are applied sequentially during the encryption rounds to provide diffusion and confusion, ensuring that each output bit depends on multiple input bits and key bits. ARIA-128 executes 12 rounds of transformation for encryption or decryption, with each round consisting of substitution layers, diffusion layers, and key mixing steps.

Substitution and Diffusion

During each round, a substitution layer replaces each byte of the state with a corresponding value from a predefined S-box. This substitution introduces non-linearity, making it resistant to linear and differential cryptanalysis. After substitution, a diffusion layer is applied using a linear transformation matrix to spread the influence of each input bit across multiple output bits. Key mixing is then performed by XORing the state with the round key generated from the key schedule. The final round omits the diffusion step but includes the last key addition to produce the encrypted block.

CTR Mode Operation

In counter mode, a unique counter value, typically combined with a nonce, is incremented for each block of plaintext. The counter is encrypted using ARIA-128 to produce a keystream block. This keystream is XORed with the plaintext block to generate ciphertext. The same process is applied during decryption: the counter is encrypted to recreate the keystream, which is then XORed with the ciphertext to recover the original plaintext. CTR mode allows parallel processing of blocks, enabling high throughput and efficient hardware and software implementation. Additionally, it provides random access to encrypted data blocks, making it suitable for applications requiring fast read and write operations.

Security Properties

ARIA-128-CTR inherits the security properties of the ARIA cipher and the counter mode. The SPN structure ensures strong resistance against known cryptanalytic attacks, and the CTR mode guarantees that identical plaintext blocks produce distinct ciphertext blocks if the counter or nonce is unique. Proper implementation requires careful management of the counter and nonce to prevent repetition, which could compromise confidentiality. Overall, ARIA-128-CTR combines efficient processing with robust cryptographic strength for secure data encryption in various applications.

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