Techniques for assessing the trustworthiness of a target device that a user device is attempting to communicate with are described. A user device may request one or more trustworthiness attributes of a target device before exchanging data with the target device. The user device may receive the one or more trustworthiness attributes of the target device, and determine, based on the received one or more trustworthiness attributes of the target device, a set of one or more security policies to enforce on a communication channel used for exchanging data between the user device and the target device. A communication channel between the user device and the target device can then be established according to the set of one or more security policies.