In cryptanalysis, security of ciphers vis-a-vis attacks is gauged against three criteria of complexities, i.e., computations, memory and time. Some features may not be so apparent in a particular domain, and their analysis in a transformed domain often reveals interesting patterns. Moreover, the complexity criteria in different domains are different and performance improvements are often achiev...

A combiner for collision-resistant hash functions takes two functions as input and implements a hash function with the guarantee that it is collision-resistant if one of the functions is. It has been shown that such a combiner cannot have short output (Pietrzak, Crypto 2008); that is, its output length is lower bounded by roughly 2n if the ingoing functions output n-bit hash values. In this pap...

A robust multi-property combiner for a set of security properties merges two hash functions such that the resulting function satisfies each of the properties which at least one of the two starting functions has. Fischlin and Lehmann (TCC 2008) recently constructed a combiner which simultaneously preserves collision-resistance, target collision-resistance, message authentication, pseudorandomnes...

A (k;n)-robust combiner for a primitive F takes as input n candidate implementations of F and constructs an implementation of F , which is secure assuming that at least k of the input candidates are secure. Such constructions provide robustness against insecure implementations and wrong assumptions underlying the candidate schemes. In a recent work Harnik et al. (Eurocrypt 2005) have proposed a...

White-box security techniques are employed to protect programs so that they can be executed securely in untrusted environments, e.g. for copyright protection. We present the first robust combiner for white-box primitive, specifically for White-Box Remote Program Execution (WBRPE) schemes. The WBRPE combiner takes two input candidate WBRPE schemes, W ′ and W ′′, and outputs a third candidate W =...

<span>This article clarified the basic fiber Bragg grating (FBG) apodization functions effects on filtered optical acoustic signal (AS). Max power variations after acousto optic filter is with spectral wavelength variations. FBG are uniform, Gaussian, and Tanh. We have tested max various The AS amplitude electrical combiner reported based Apodization functions. studied lengths for at cent...

In this work, we present a digital power amplifier (DPA) and signal-optimized control technique suitable for the amplification of orthogonal frequency division multiplexing (OFDM). OFDM is high peak-to-average ratio (PAPR) signal that naturally arising from spectrum efficiency modulations. A 3-bit DPA implemented with three power-scaled transistors which are turned on off based amplitude, while...