An information transmitting method, comprising a terminal device: sending a login request to a service device by using an encrypted connection, wherein the login request includes a user account and a login password; receiving a login token assigned by the service device after the service device verifies the user account and the login password, wherein the login token has a validity period; jumping from a login interface to an interface for opening the Find Device Function; acquiring the login password, a device identity, a mobile phone number, and the login token; generating plaintext information configured to be transmitted, wherein the login password, the device identity, the mobile phone number, and the login token are combined into the plaintext information; generating a symmetric key corresponding to the current opening operation; encrypting the plaintext information by using the symmetric key to form first ciphertext information; acquiring an asymmetric cryptographic public key corresponding to the service device; encrypting the symmetric key by using the asymmetric cryptographic public key to form second ciphertext information; and transmitting the first ciphertext information and the second ciphertext information to the service device, wherein the service device stores an asymmetric encrypted private key corresponding to the asymmetric cryptographic public key, the service device obtains the plaintext information after decrypting the first ciphertext information and the second ciphertext information, and opens the Find Device Function when the login token matches the login password and is within a validity period. sending a login request to a service device by using an encrypted connection, wherein the login request includes a user account and a login password; receiving a login token assigned by the service device after the service device verifies the user account and the login password, wherein the login token has a validity period; jumping from a login interface to an interface for opening the Find Device Function; acquiring the login password, a device identity, a mobile phone number, and the login token; generating plaintext information configured to be transmitted, wherein the login password, the device identity, the mobile phone number, and the login token are combined into the plaintext information; generating a symmetric key corresponding to the current opening operation; encrypting the plaintext information by using the symmetric key to form first ciphertext information; acquiring an asymmetric cryptographic public key corresponding to the service device; encrypting the symmetric key by using the asymmetric cryptographic public key to form second ciphertext information; and transmitting the first ciphertext information and the second ciphertext information to the service device, wherein the service device stores an asymmetric encrypted private key corresponding to the asymmetric cryptographic public key, the service device obtains the plaintext information after decrypting the first ciphertext information and the second ciphertext information, and opens the Find Device Function when the login token matches the login password and is within a validity period.