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Passive RFID tags harvest their operating energy from an interrogating reader, but constant energy shortfalls severely limit their computational and storage capabilities. The paper proposes Cryptographic Computational Continuation Passing (CCCP), a mechanism that amplifies programmable passive RFID tags' capabilities by exploiting an often overlooked, plentiful resource: low-power radio communication. While radio communication is more energy intensive than flash memory writes in many embedded devices, the paper shows that the reverse is true for passive RFID tags. A tag can use CCCP to checkpoint its computational state to an untrusted reader using less energy than an equivalent flash write, thereby allowing it to devote a greater share of its energy to computation.
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