ARIA-256-GCM 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-GCM algorithm is a symmetric key block cipher designed to provide both confidentiality and integrity for data. It operates using a 256-bit key and supports a 128-bit block size, which ensures strong cryptographic security. The algorithm combines the ARIA block cipher with Galois/Counter Mode (GCM) to achieve authenticated encryption. ARIA itself is a substitution-permutation network that uses multiple rounds of transformations to convert plaintext into ciphertext securely.

Key Schedule

The key schedule in ARIA-256-GCM expands the original 256-bit key into a set of round keys. These round keys are applied sequentially in the encryption process. The expansion involves multiple layers of substitution using S-boxes, permutation, and diffusion operations that distribute the key material across the entire block, ensuring that every bit of the key influences the resulting ciphertext.

Encryption Process

The encryption process begins by dividing the plaintext into 128-bit blocks. Each block undergoes several rounds of substitution and permutation. The substitution step replaces bytes of data using non-linear S-box transformations, while the permutation step rearranges bits within the block to increase diffusion. After completing the defined number of rounds, the final block is XORed with a round key derived from the key schedule to produce the ciphertext block.

Galois/Counter Mode (GCM)

GCM adds authenticated encryption capabilities to ARIA-256. In GCM, a counter is incremented for each block and encrypted using ARIA-256. The resulting value is then XORed with the plaintext block to produce ciphertext. Simultaneously, a Galois field multiplication generates an authentication tag that verifies both integrity and authenticity of the encrypted data. The authentication tag is appended to the ciphertext for secure transmission.

Security Considerations

ARIA-256-GCM provides high resistance against cryptanalytic attacks due to the combination of a strong 256-bit key, multiple rounds of non-linear transformations, and the authenticated encryption provided by GCM. The algorithm ensures that any modification of the ciphertext can be detected through verification of the authentication tag. Proper implementation requires secure handling of initialization vectors and unique nonces for each encryption session.

Performance Characteristics

The ARIA-256-GCM algorithm is optimized for both hardware and software implementations. Its design allows parallel processing of blocks in GCM mode, enhancing throughput for large datasets. While the 256-bit key increases computational complexity compared to shorter keys, it also provides a higher security margin suitable for sensitive applications. Memory requirements are moderate, primarily influenced by the key schedule and precomputed Galois field tables.

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