Controlling devices remotely using short message service
An administrator charged with responsibility for one or more administered wireless devices can use a wireless device to disable lost or stolen devices using an SMS lost-mode message. The data of the lost-mode message can be encrypted to prevent malicious attacks. The encrypted data may include a universal device identifier unique to the target device, the phone number of the administrator's device, and a time stamp memorializing command or message creation. Successful decryption authenticates the administrator. Before executing the lost-mode command, however, the target device reviews the unique identifier to verify the target and compares the phone number of the administrator's device with the number identified with the incoming SMS message to authenticate the relaying device. The target device can also consider an embedded time stamp to determine whether the lost-device command has been superseded.
1. A method of controlling a target wireless device designated by a target-wireless-device phone number using an administrative wireless device designated by an administrative-wireless-device phone number, the method comprising:
encrypting by a server data that includes the administrative-wireless-device phone number, thereby creating encrypted data; and
directing a lost-mode message to the target-wireless-device phone number, the lost-mode message including the encrypted data.
2. The method of claim 1 , further comprising receiving the encrypted data at the administrative wireless device.
3. The method of claim 1 , further comprising requesting the encrypted data responsive to a report identifying the target wireless device.
4. The method of claim 1 , wherein the encrypted data comprises a lost-mode command.
5. The method of claim 1 , wherein the encrypted data includes the target-wireless-device phone number.
6. The method of claim 1 , wherein the encrypted data includes an identifier unique to the target wireless device.
7. The method of claim 1 , wherein the lost-mode message includes a time stamp indicative of a time the lost-mode message was created.
8. The method of claim 7 , further comprising, at the target wireless device:
comparing the time stamp with an earlier-received time stamp associated with another command.
9. The method of claim 1 , further comprising, at the target wireless device:
receiving the lost-mode message accompanied by a sender phone number;
comparing the sender phone number to the administrative-wireless-device phone number; and
executing a lost-mode command responsive to the comparing.
10. A method of controlling a target wireless device designated by a target-wireless-device phone number using an administrative wireless device designated by an administrative-wireless-device phone number, the method comprising:
receiving at the administrative wireless device encrypted data that includes the administrative-wireless-device phone number; and
directing a lost-mode message to the target-wireless-device phone number, the lost-mode message including the encrypted data.
11. The method of claim 10 , further comprising requesting the encrypted data by the administrative wireless device.
12. The method of claim 10 , wherein the receiving the encrypted data is responsive to a report identifying the target wireless device.
13. The method of claim 10 , wherein the encrypted data comprises a lost-mode command.
14. The method of claim 10 , wherein the encrypted data includes the target-wireless-device phone number.
15. The method of claim 10 , wherein the encrypted data includes an identifier unique to the target wireless device.
16. The method of claim 10 , wherein the lost-mode message includes a time stamp indicative of a time the lost-mode message was created.
17. The method of claim 16 , further comprising, at the target wireless device:
comparing the time stamp with an earlier-received time stamp associated with another command.
18. The method of claim 10 , further comprising, at the target wireless device:
receiving the lost-mode message accompanied by a sender phone number;
comparing the sender phone number to the administrative-wireless-device phone number; and
executing a lost-mode command responsive to the comparing.
19. A system for controlling a target wireless device designated by a target-wireless-device phone number, the system comprising:
an administrative device designated by an administrative-wireless-device phone number, the administrative device adapted to receive encrypted data that includes the administrative-wireless-device phone number as an encrypted number and to convey a lost-mode message to the target-wireless-device phone number, the lost-mode message including a payload with a lost-mode command and the encrypted number.
20. The system of claim 19 , further comprising a server that stores a private key that is used to encrypt the administrative-wireless-device phone number to produce the encrypted number.
21. The system of claim 19 , wherein the lost-mode message specifies the target-wireless-device phone number and a device identifier of the target wireless device.