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We study the problem of searching on data that is encrypted using a public key system. Consider user Bob who sends email to user Alice encrypted under Alice's public key. An email gateway wants to test whether the email contains the keyword " urgent " so that it could route the email accordingly. Alice, on the other hand does not wish to give the gateway… (More)

We consider the following generalization of the popular \15 puzzle." Let T be a tree with n vertices and with k < n distinct pebbles numbered 1; ;k on distinct vertices. A move consists in transferring a pebble from its current position to an adjacent unoccupied vertex. We ask the following question: Is a given arrangement of pebbles reachable from another?… (More)

Non-Interactive Zero Knowledge (NIZK), introduced by Blum, Feld-man, and Micali in 1988, is a fundamental cryptographic primitive which has attracted considerable attention in the last decade and has been used throughout modern cryptography in several essential ways. For example, NIZK plays a central role in building provably secure public-key cryptosystems… (More)

We investigate the possibility of disposing of interaction between Prover and Veriier in a zero-knowledge proof if they share beforehand a short random string. Without any assumption, we prove that non-interactive zero-knowledge proofs exist for some number theoretic languages for which no eecient algorithm is known. If deciding quadratic residuosity… (More)

In the bare public-key model (BPK in short), each verifier is assumed to have deposited a public key in a file that is accessible by all users at all times. In this model, introduced by Canetti et al. [STOC 2000], constant-round black-box concurrent and resettable zero knowledge is possible as opposed to the standard model for zero knowledge. As pointed out… (More)

The aim of this paper is twofold. 1) We raise concerns regarding possible violations of user privacy relative to the use of X509 Certificates and the Transport Layer Security protocol. We stress that this approach to secure network transactions, while preserving the interests of service providers, neglects to consider the right to privacy of the users. 2)… (More)

We consider the problem of optimally placing identical resources at the nodes of a weighted tree-shaped network of size N. The resources satisfy requests issued from the nodes of the network. The cost of a placement of the resources is the sum over all nodes of the network of the product of the node weight times the distance from the closest resource. The… (More)