Method, equipment and system used for establishing secure connection

An embodiment of the invention provides a method, equipment and system used for establishing secure connection. First equipment securely obtains a first public key estimated value of second equipment through an out of band mode. The first public key estimated value is used to encrypt an asymmetric encryption public key. The encrypted asymmetric encryption public key is sent to the second equipment. An encrypted first secret key exchange public key sent by the second equipment is received. The encrypted asymmetric encryption public key is used to decrypt the encrypted first secret key exchange public key. A preset algorithm is used to perform operation based on the decrypted first secret key exchange public key, so as to obtain a second public key estimated value. When the first public key estimated value is identical to the second public key estimated value, the decrypted first secret key exchange public key is determined to be correct, a secret key exchange public key and the first secret key exchange public key are used to generate a shared secret key, and the shared secret key is used to establish secure connection with the second equipment. The invention solves the problem that the security of network connection between equipment is poor in the prior art. The invention relates to the field of mobile communication technologies.