We analyze the security of the CTR + CBC-MAC (CCM) encryption mode. This mode, proposed by Doug Whiting, Russ Housley, and Niels Ferguson, combines the CTR (“counter”) encryption mode with CBC-MAC message authentication and is based on a block cipher such as AES. We present concrete lower bounds for the security of CCM in terms of the security of the underlying block cipher. The conclusion is t...

Content A physical and concrete context for the theory .................................................................................. 1 Entering in the domain of validity of the theory of the (E) question .................................................. 2 Definition 01: extended Lie’s product (or bracket) ......................................................................... 2 A statem...

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We study notions and schemes for symmetric (ie. private key) encryption in a concrete security framework. We give four di erent notions of security against chosen plaintext attack and analyze the concrete complexity of reductions among them, providing both upper and lower bounds, and obtaining tight relations. In this way we classify notions (even though polynomially reducible to each other) as...

In this paper, we introduce Farfalle, a newmode for building a pseudorandom function (PRF) from a b-bit cryptographic permutation. The constructed PRF takes as input a b-bit key and a sequence of variable-length data strings, and it generates a variable-length output. It consists of a compression layer and an expansion layer, each of them involving the parallel application of the permutation. T...

We propose a packet switched platform for single chip systems which scales well to an arbitrary number of processor like resources. The platform, which we call Network-on-Chip (NOC), includes both the architecture and the design methodology. The NOC architecture is a m × n mesh of switches and resources are placed on the slots formed by the switches. We assume a direct layout of the 2-D mesh of...

Concrete, the solid that forms at room temperature from mixing Portland cement with water, sand, and aggregates, suffers from time-dependent deformation under load. This creep occurs at a rate that deteriorates the durability and truncates the lifespan of concrete structures. However, despite decades of research, the origin of concrete creep remains unknown. Here, we measure the in situ creep b...

In this work, a multi-objective optimization on novel insulated roof with solar water heating system at low material cost has been carried out through Taguchi based grey relational analysis technique. The novel roofs have concrete, insulating polyurethane, and a channel of water in a metallic pipe tunneling the chromium block. Chromium block is used to conduct more heat to raise the water to re...