Encryption Key Generator - Create Secure Cryptographic Keys
Generate cryptographically secure encryption keys for AES, RSA, and other algorithms. Choose key sizes from 128 to 4096 bits. All generation happens in your browser.
Click to copy the key to your clipboard. Store this key securely!
What is Encryption Key Generator?
An Encryption Key Generator creates cryptographic keys used to encrypt and decrypt data. These keys are fundamental to data security, enabling secure storage, transmission, and authentication.
Types of encryption keys:
- Symmetric keys - Same key for encryption and decryption (AES, ChaCha20). Fast and efficient for bulk data.
- Asymmetric keys - Public/private key pairs (RSA, ECC). Public key encrypts, private key decrypts.
- Session keys - Temporary keys for single communication sessions, often exchanged using asymmetric encryption.
Key strength is measured in bits. For AES, 256 bits provides quantum-resistant security. For RSA, 2048 bits is the minimum recommended, with 4096 bits for long-term security.
Examples
AES-256 key (hex format)
Input:
Type: AES, Size: 256 bitsOutput:
a1b2c3d4e5f67890a1b2c3d4e5f67890a1b2c3d4e5f67890a1b2c3d4e5f67890AES-128 key (Base64)
Input:
Type: AES, Size: 128 bitsOutput:
obLD1OXWeNC4S5X+YcQ9pw==RSA-2048 private key (PEM)
Input:
Type: RSA, Size: 2048 bitsOutput:
-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----Generate AES Key in Node.js
const crypto = require('crypto');
// Generate AES-256 key
const aesKey = crypto.randomBytes(32); // 256 bits
console.log('AES-256 Key (hex):', aesKey.toString('hex'));
console.log('AES-256 Key (base64):', aesKey.toString('base64'));
// Generate AES-128 key
const aes128Key = crypto.randomBytes(16); // 128 bits
console.log('AES-128 Key:', aes128Key.toString('hex'));
// Generate RSA key pair
const { publicKey, privateKey } = crypto.generateKeyPairSync('rsa', {
modulusLength: 2048,
publicKeyEncoding: { type: 'spki', format: 'pem' },
privateKeyEncoding: { type: 'pkcs8', format: 'pem' }
});Common Mistakes
- ✗Using weak key sizes - AES-128 is acceptable but AES-256 is recommended for new systems.
- ✗Hardcoding keys in source code - Always use key management services or secure storage.
- ✗Never rotating keys - Implement regular key rotation to limit exposure from potential breaches.
- ✗Using the same key for multiple purposes - Different keys for encryption, signing, and authentication.
- ✗Storing keys alongside encrypted data - Keys should be stored separately, ideally in a KMS or HSM.
🔐 Security Note
For production systems, use Hardware Security Modules (HSMs) or cloud key management services (AWS KMS, GCP Cloud KMS, Azure Key Vault) to store and manage encryption keys. Never store master keys in code or config files.
Frequently Asked Questions
What's the difference between AES and RSA keys?▼
AES is a symmetric algorithm - the same key encrypts and decrypts. It's fast and ideal for bulk data. RSA is asymmetric - a public key encrypts and a private key decrypts. RSA is slower and typically used to exchange AES keys or for digital signatures.
What key size should I use?▼
For AES: 256 bits is recommended for most applications. For RSA: 2048 bits minimum, 4096 bits for long-term security. For ECC: 256 bits (P-256) or 384 bits (P-384) provide strong security with smaller key sizes than RSA.
How should I store encryption keys?▼
Never store keys in source code. For production: use a Key Management Service (AWS KMS, GCP Cloud KMS, Azure Key Vault) or Hardware Security Module (HSM). For development: use environment variables or local secret managers like HashiCorp Vault.
When should I rotate encryption keys?▼
Rotate keys at least annually for most applications. More frequent rotation (quarterly or monthly) is recommended for highly sensitive data. Implement rotation without downtime by supporting multiple valid keys during transition.