AES-256-GCM-SIV 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

Key Features

Key Size: Utilizes a 256-bit secret key, providing 2²⁵⁶ possible key combinations.
Mode of Operation: Combines Galois/Counter Mode with a Synthetic IV, enhancing safety against repeated nonces.
Nonce Misuse Resistance: The SIV construction ensures that even if a nonce is reused, data confidentiality is maintained, preventing catastrophic failures common in standard GCM.
Authenticated Encryption: Simultaneously encrypts and authenticates data, producing a ciphertext and a 128-bit authentication tag to verify integrity.

Encryption Process

Key Expansion: The 256-bit key is expanded into round keys for the AES block cipher operations.
Authentication Tag Generation: The input plaintext and associated data are processed to compute a synthetic IV using a pseudorandom function, ensuring deterministic encryption.
Counter Mode Encryption: The plaintext is divided into blocks, and each block is XORed with AES-encrypted counter values derived from the synthetic IV.
Finalization: A 128-bit authentication tag is appended to the ciphertext, which allows verification of both the plaintext and associated data during decryption.

Decryption Process

Decryption reverses the encryption steps. The algorithm first computes the synthetic IV from the ciphertext and associated data, then decrypts each block using AES in counter mode. Finally, the computed authentication tag is compared with the appended tag to ensure integrity and authenticity of the data. Any mismatch results in rejection of the ciphertext.

Security Advantages

Provides strong confidentiality with AES-256 encryption.
Protects against nonce reuse errors, reducing risks of cryptographic attacks.
Supports authenticated encryption with associated data (AEAD) for secure communication.
Efficient for high-throughput applications due to parallelizable counter mode operations.

Applications

AES-256-GCM-SIV is suitable for securing sensitive communications, encrypted storage, and protocols that require both data confidentiality and integrity under conditions where nonce management might be imperfect. Its robust design ensures reliability even in systems where nonce uniqueness cannot be strictly guaranteed.

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