What does Agilent's incomplete key functions mean?

According to Baidu Library, Agilent's incomplete key function is a security mechanism of Agilent, which is used to limit the connection between instruments and software. This function uses an incomplete key, so only people with corresponding rights can connect and use the instrument. In addition, the use of this function also requires good signal conditions. Only when the signal is good can the instrument be connected to the mobile phone normally and then used.

A key is a parameter entered in an algorithm for converting plaintext into ciphertext or ciphertext into plaintext. Keys are divided into symmetric keys and asymmetric keys.