AES-GCM Authenticated Encryption & Decryption Studio

The Advanced Encryption Standard (AES) is the gold standard for symmetric-key cryptography worldwide, standardized by the US National Institute of Standards and Technology (NIST FIPS 197). When paired with Galois/Counter Mode (GCM), AES delivers Authenticated Encryption with Associated Data (AEAD).

Unlike unauthenticated legacy modes like CBC or ECB, AES-GCM provides both confidentiality and tamper-proof cryptographic authentication. If an attacker modifies even a single bit of the ciphertext in transit, decryption fails with an authentication tag mismatch, completely neutralizing bit-flipping and padding oracle attacks.

WebDevWorker implements password-based key derivation using PBKDF2 (100,000 iterations of SHA-256 with a unique 16-byte cryptographic salt) and 12-byte initialization vectors (IVs) generated via crypto.getRandomValues().

The cryptographic pipeline combines key derivation, counter encryption, and Galois field polynomial authentication:

• PBKDF2 Key Derivation: \( K_{\text{AES}} = \text{PBKDF2}(\text{password}, \text{salt}, 100000, 256) \)
• GCM Encryption: Plaintext blocks \( P_i \) are XORed with AES-encrypted counter blocks: \( C_i = P_i \oplus E_K(\text{IV} \parallel i) \)
• GHASH Authentication Tag: Evaluates polynomial multiplication over binary Galois field \( \text{GF}(2^{128}) \) to verify ciphertext authenticity.

Software engineers can integrate these exact patterns directly into automated microservices, build pipelines, or component stylesheets. Below is a production-grade code snippet demonstrating programmatic implementation:

// TypeScript AES-256-GCM Encryption via Web Crypto API
export async function encryptAesGcm(text: string, password: string): Promise<string> {
  const enc = new TextEncoder();
  const salt = crypto.getRandomValues(new Uint8Array(16));
  const iv = crypto.getRandomValues(new Uint8Array(12));

  const keyMaterial = await crypto.subtle.importKey(
    'raw', enc.encode(password), { name: 'PBKDF2' }, false, ['deriveKey']
  );

  const key = await crypto.subtle.deriveKey(
    { name: 'PBKDF2', salt, iterations: 100000, hash: 'SHA-256' },
    keyMaterial, { name: 'AES-GCM', length: 256 }, false, ['encrypt']
  );

  const cipherBuffer = await crypto.subtle.encrypt(
    { name: 'AES-GCM', iv }, key, enc.encode(text)
  );

  // Bundle salt (16B) + IV (12B) + ciphertext
  const bundle = new Uint8Array(16 + 12 + cipherBuffer.byteLength);
  bundle.set(salt, 0);
  bundle.set(iv, 16);
  bundle.set(new Uint8Array(cipherBuffer), 28);

  return btoa(String.fromCharCode(...bundle));
}

The table below documents the architectural standards, compliance parameters, and browser runtime capabilities governing AES-GCM Authenticated Encryption & Decryption Studio:

• Never reuse an IV with the same key in AES-GCM: Reusing an IV destroys the authenticity guarantees of Galois/Counter Mode.
• Use at least 100,000 PBKDF2 rounds: High iteration counts protect weak passwords against GPU-based offline dictionary attacks.
• Use authenticated encryption (AEAD): Never implement custom encryption without an authentication tag (GCM or ChaCha20-Poly1305).
• Clear memory after decryption: Overwrite plaintext buffers in memory when processing highly sensitive credentials.
• Transport over HTTPS only: Client-side encryption complements TLS transport security; it does not replace it.