AES-192-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 AES-192-GCM algorithm is a symmetric key encryption method that combines the Advanced Encryption Standard (AES) with a 192-bit key size and the Galois/Counter Mode (GCM) of operation. This configuration is specifically designed to provide both confidentiality and integrity for data in transit or at rest. AES, standardized by NIST, operates on fixed-size blocks of 128 bits, while the 192-bit key allows for a higher security margin compared to AES-128. The Galois/Counter Mode extends AES with an authenticated encryption mechanism that generates a unique authentication tag for each encrypted message.

Key Expansion

AES-192-GCM begins with a 192-bit key which undergoes a key expansion process to generate a set of round keys used in multiple transformation rounds. Each round applies a sequence of operations, including SubBytes, ShiftRows, MixColumns, and AddRoundKey. The expanded key schedule ensures that every round key is uniquely derived from the original key, maintaining cryptographic strength throughout the encryption process.

Encryption Process

In GCM mode, AES operates in counter mode (CTR) to convert plaintext into ciphertext. The plaintext is divided into 128-bit blocks, and a counter value is combined with the key to produce a keystream block. Each plaintext block is XORed with the corresponding keystream block to generate ciphertext. The counter is incremented for each block to ensure that the keystream is unique and non-repeating, which is essential for security.

Authentication

GCM adds a built-in authentication mechanism using the Galois field multiplication over a binary polynomial. It computes an authentication tag based on both the ciphertext and any additional authenticated data (AAD). This tag allows verification that the data has not been altered, providing integrity alongside confidentiality. The authentication process uses a hash function over the Galois field and combines it with the ciphertext blocks to produce a fixed-length tag.

Decryption Process

Decryption mirrors encryption. The ciphertext is XORed with the same keystream generated using the original key and counter values. The authentication tag is recalculated from the decrypted ciphertext and AAD, and it must match the received tag for the decryption to be considered valid. If the tags differ, the data is rejected to prevent unauthorized tampering.

Performance and Security

AES-192-GCM is optimized for parallel processing, allowing multiple blocks to be encrypted or decrypted simultaneously. The algorithm provides strong resistance against known attacks, including differential and linear cryptanalysis. The 192-bit key length increases the key space to 2¹⁹², making brute-force attacks computationally infeasible with current technology. Its combined encryption and authentication capability makes it suitable for network protocols, secure file storage, and other applications requiring high security assurance.

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