SM2 Encrypt/Decrypt - Free Online Tool | PivaBox

Encrypt and decrypt using SM2 — Chinese national standard for elliptic curve public-key cryptography

How to Use SM2 Encrypt/Decrypt

1. Click Generate Key Pair to create an SM2 public/private key pair, or paste your own keys in hexadecimal format
2. For encryption: enter plaintext and the recipient's public key. For decryption: paste ciphertext and the corresponding private key
3. Choose the output format (Hex or Base64), click the action button, and copy the result

Frequently Asked Questions

What is SM2?

SM2 is an elliptic curve cryptography (ECC) standard published by the Chinese State Cryptography Administration as GM/T 0003. It defines algorithms for digital signatures, key exchange, and public key encryption using a 256-bit elliptic curve. It is widely used in Chinese government, financial, and commercial systems.

Does my data leave my device?

No. All key generation, encryption, and decryption operations happen entirely in your browser. No data is ever sent to any server. Your keys and plaintext remain on your device at all times.

How is SM2 different from SM4?

SM2 is an <strong>asymmetric</strong> (public-key) algorithm — it uses a key pair (public and private). SM4 is a <strong>symmetric</strong> (secret-key) block cipher. SM2 is used for key exchange and digital signatures, while SM4 is used for bulk data encryption. They often work together: SM2 exchanges a session key, then SM4 encrypts the data.