A block cipher encrypts data one block at a time. For bulk data encryption, a block cipher is usually used in a mode of operation. Cipher Block Chaining (CBC) mode encryption is one of the most commonly used modes of operation. The security properties of CBC mode encryption have been studied extensively. One well-known attack against CBC mode encryption allows an attacker, with some restriction...

The Birkhoff polytope Bn is the convex hull of all (n×n) permutation matrices, i.e., matrices where precisely one entry in each row and column is one, and zeros at all other places. This is a widely studied polytope with various applications throughout mathematics. In this paper we study combinatorial types L of faces of a Birkhoff polytope. The Birkhoff dimension bd(L) of L is the smallest n s...

Differentially Private Traffic Padding for Web Applications

We show how to construct a practical secure signature padding scheme for arbitrarily long messages from a secure signature padding scheme for fixed-length messages. This new construction is based on a one-way compression function respecting the division intractability assumption. By practical, we mean that our scheme can be instantiated using dedicated compression functions and without chaining...

In 2005, the WiMedia Alliance working with the European Computer Manufacturers Association (ECMA) announced the establishment of the WiMedia MB-OFDM (Multiband Orthogonal Frequency Division Multiplexing) UWB radio platform as their global UWB standard. It was also chosen as the physical layer (PHY) of high data rate wireless specifications for high speed Wireless USB (W-USB), Bluetooth 3.0 and ...

An auto-sorting algorithm for image sequences with different sizes is presented in this paper. The algorithm is suitable for sorting image sequences, such as images in matrix form. Zero padding is used in the stern of image matrices for images with different sizes in the image sequence. As a result, all images adopt the same size. Based on phase correlation, the position relationship between tw...

Despite significant progress in the caching literature concerning the worst case and uniform average case regimes, the algorithms for caching with nonuniform demands are still at a basic stage and mostly rely on simple grouping and memorysharing techniques. In this work we introduce a novel centralized caching strategy for caching with nonuniform file popularities. Our scheme allows for assigni...

Multiple-Output (MIMO) antenna systems provide high transmission data rate, spectral efficiency and reliability for wireless communication systems. These parameters can be further improved by combating fading, the effect of which can be reduced by properly estimating the channel at the receiver side. In this paper a new approach based on time-domain interpolation (TDI) has been presented. TDI i...

In the following paper we investigate into the estimation of sinusoidal parameters for sinusoids with linear AM/FM modulation. It will be shown that for linear amplitude and frequency modulation only the frequency modulation creates additional estimation bias for the standard sinusoidal parameter estimator. Then an enhanced algorithm for frequency domain demodulation of spectral peaks is propos...