SM4 Encryption/Decryption Online

Online SM4 block cipher encryption tool. Chinese national standard symmetric encryption algorithm with multiple operation modes.

Configuration

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Encryption/Decryption

Plaintext Format:
Ciphertext Format:

About SM4

What is SM4?

SM4 is a block cipher algorithm with 128-bit key length and block size.

Operation Modes

ECB mode is simple but less secure. CBC mode provides better security.

Applications

Widely used in Chinese financial systems and government applications.