SMS is encrypted. Is there any accepted software?

no. Encrypted short messages are encrypted as soon as they leave the mobile phone, whether in the process of air transmission or in the storage process of the operator's short message gateway. Even if the short message is taken away by the receiver, he can't view the content of the short message without the correct decryption key. The short message is encrypted without accepted software. The short message encryption technology uses the receiver's mobile phone number as the encryption public key, without online exchange or offline negotiation.