🔐 AES Encryption Tool

Professional AES encryption tool supporting AES-128/192/256 with multiple cipher modes (CBC, ECB, CFB, OFB, GCM) for secure data encryption and decryption

What is AES Encryption?

AES (Advanced Encryption Standard) is a symmetric encryption algorithm adopted by the U.S. federal government. It supports key sizes of 128, 192, and 256 bits, providing different levels of security. AES is widely used for securing sensitive data in various applications including file encryption, database protection, and network communications.

Key Strengths

AES-128: 128-bit key, fast performance
AES-192: 192-bit key, enhanced security
AES-256: 256-bit key, maximum security

Cipher Modes

CBC: Cipher Block Chaining (recommended)
ECB: Electronic Codebook (basic)
CFB/OFB: Stream cipher modes
GCM: Authenticated encryption

Use Cases

File and database encryption
Secure communications (HTTPS, VPN)
API key and credential protection
Payment and financial data security

Security Best Practices

Always use strong, randomly generated keys. Never reuse IVs with the same key. Avoid ECB mode for production use. Consider using authenticated encryption modes like GCM. This tool performs client-side encryption only - your data never leaves your browser.

Algorithm & Mode Settings

AES Algorithm & Mode

Key Length:256 bits

Security:Very High

IV Length:128 bits

Output Format

Key & IV Management

Encryption Key (256 bits)

Required

Initialization Vector (IV) (128 bits)

Required

Input Data

Characters: 0

Encrypted Result

Output Length: 0

AES Algorithm Details & Implementation Examples

Algorithm Information

Algorithm:AES-256-CBC

Key Length:256 bits

IV Length:128 bits

Security Level:Very High

Performance:Good

Recommended:common.yes

Mode Characteristics

• CBC (Cipher Block Chaining) encrypts each block using the previous ciphertext block

• Provides good security and is widely supported

• Requires unique IV for each encryption operation

• Suitable for most general-purpose encryption needs

Use Cases & Recommendations

File Encryption

Document encryption, database encryption, backup protection

Legacy Systems

Compatibility with older systems and standards

General Purpose

Most common mode for general encryption needs

Code Implementation Examples

JavaScript (Node.js + crypto)

const crypto = require('crypto');

class AESCrypto {
  constructor() {
    this.algorithm = 'aes-256-cbc';
  }
  
  // Generate random key
  generateKey() {
    return crypto.randomBytes(32); // 256 bits
  }
  
  // Generate random IV
  generateIV() {
    return crypto.randomBytes(16); // 128 bits for CBC
  }
  
  // Encrypt data
  encrypt(plaintext, key, iv) {
    const cipher = crypto.createCipher(this.algorithm, key);
    cipher.setAutoPadding(true);
    
    let encrypted = cipher.update(plaintext, 'utf8', 'base64');
    encrypted += cipher.final('base64');
    
    return {
      encrypted,
      key: key.toString('hex'),
      iv: iv.toString('hex')
    };
  }
  
  // Decrypt data
  decrypt(encrypted, key, iv) {
    const decipher = crypto.createDecipher(this.algorithm, Buffer.from(key, 'hex'));
    
    let decrypted = decipher.update(encrypted, 'base64', 'utf8');
    decrypted += decipher.final('utf8');
    
    return decrypted;
  }
}

// Usage example
const aes = new AESCrypto();
const key = aes.generateKey();
const iv = aes.generateIV();
const plaintext = "Sensitive data to encrypt";

const result = aes.encrypt(plaintext, key, iv);
console.log('Encrypted:', result.encrypted);

const decrypted = aes.decrypt(result.encrypted, result.key, result.iv);
console.log('Decrypted:', decrypted);