HMAC Hash Encryption
Generate Keyed-Hash Message Authentication Code with your secret key
Key strength: Medium
HMAC Result
HMAC-SHA-256:
HMAC will be displayed here...
Quick Examples
hello world
API Endpoint
JSON Payload
Empty string
Preset Keys
Security Note
- Keep your secret key confidential
- For optimal security, use strong, randomly generated keys
- Never transmit your secret key over insecure channels
- HMAC operations are performed entirely in your browser
Generated Key
32-byte (256-bit) Hex Key:
Key will be displayed here...
Key Generation Notes
- Keys are generated using cryptographically secure random numbers
- For HMAC-SHA-256, a 32-byte key is recommended
- For HMAC-SHA-512, a 64-byte key is recommended
- Store your generated keys securely
- Generated keys are only available in your browser
Compare HMAC Values
About HMAC Verification
- HMAC verification ensures that a message has not been tampered with
- Both parties must know the same secret key
- The sender computes the HMAC and sends both the message and HMAC
- The receiver computes the HMAC of the received message and compares it to the received HMAC
- If the HMACs match, the message is authentic and has not been altered
About HMAC
- HMAC stands for Keyed-Hash Message Authentication Code
- HMAC combines a cryptographic hash function with a secret key
- It provides both message integrity and authentication
- HMAC is resistant to collision attacks, even if the underlying hash function is not
- Common use cases include API authentication, message signing, and data integrity verification
- All operations are performed locally in your browser, your data never leaves your device
Important Security Considerations
- Never share your secret keys with unauthorized parties
- Rotate your keys periodically to maintain security
- Use a key management system for production applications
- HMAC-SHA-1 is less secure than SHA-2 based HMACs and should be avoided for new applications
- Always use HTTPS when transmitting HMACs