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Message authenticity (knowing " who sent this message ") is an important security issue for sensor networks, and often difficult to solve. Sometimes, it may be sufficient and more efficient to solve the simpler entitiy recognition problem, instead: " is the message from the same entity that sent the previous messages? ". This paper describes entity(More)
Entity recognition does not ask whether the message is from some entity X, just whether a message is from the same entity as a previous message. This turns turns out to be very useful for low-end devices. The current paper proposes a new protocol – the " Jane Doe Protocol " –, and provides a formal proof of its concrete security. The protocol neither(More)
Ripple is a payment system and a digital currency which evolved completely independently of Bitcoin. Although Ripple holds the second highest market cap after Bitcoin, there are surprisingly no studies which analyze the provisions of Ripple. In this paper, we study the current deployment of the Ripple payment system. For that purpose, we overview the Ripple(More)
At CHES 2010, the new block cipher PRINTcipher was presented as a lightweight encryption solution for printable circuits [15]. The best attack to date is a differential attack [1] that breaks less than half of the rounds. In this paper, we will present a new attack called invariant subspace attack that breaks the full cipher for a significant fraction of(More)
Cache timing attacks are a class of side-channel attacks that is applicable against certain software implementations. They have generated significant interest when demonstrated against the Advanced En-cryption Standard (AES), but have more recently also been applied against other cryptographic primitives. In this paper, we give a cache timing cryptanalysis(More)