1. An apparatus, comprising: a processor; an interface capable of connection to a network; an indicator mechanism coupled to the processor and configured to output a binary representation of a security state of the apparatus and another device wherein the output is perceivable to a user of at least one of the apparatus and the device: a computer readable storage medium coupled to the processor comprising instructions which when executed by the processor cause the processor to: initiate a security transaction between the apparatus and the device, the security transaction including a protocol that uses one or more public keys to establish a shared secret state between the apparatus and the device; establish the security state between the apparatus and the device based on the exchanged cryptographic keys and key agreement parameter data; and cause the indicator mechanism to output the binary representation to the user based on the established security state.