First, we define a user-interface primitive, oblivious comparison, that allows users to approve authentic associations and abort compromised ones. This distills and generalizes several existing approve/abort mechanisms, and moreover we experimentally show that OC can be implemented using very little hardware: one LED and one switch.
Second, we provide a new Message Recognition Protocol (MRP) that allows devices associated using oblivious comparison to exchange authenticated messages without the use of public-key cryptography (which exceeds the capabilities of many IoT devices). This protocol improves upon previously proposed MRPs in several respects.
Third, we propose a robust definition of security for MRPs that is based on universal composability, and show that our MRP satisfies this definition.Category / Keywords: secret-key cryptography / Authentication,Embedded devices, Lightweight cryptography, Bluetooth, Out of band channel, Universal composability Original Publication (with major differences): SIOT 2015 Date: received 25 Sep 2015 Contact author: almogbenin at gmail com Available format(s): PDF | BibTeX Citation Version: 20150928:195245 (All versions of this report) Short URL: ia.cr/2015/940 Discussion forum: Show discussion | Start new discussion