We give a generic construction for universal designated-verifier signature schemes from a large class, C, of signature schemes. The resulting schemes are efficient and have two important properties. Firstly, they are provably DV-unforgeable, non-transferable and also non-delegatable. Secondly, the signer and the designated verifier can independently choose their cryptographic settings. We also ...

In this thesis, we explore a topic within cryptography called Message Authentication Codes (MACs). A MAC is a collection of algorithms which allows A to send a message to B in such a way that B can be certain (with very high probability) that A did in fact originate the message. Let’s say A wants to send a message (string) M to B using a MAC. First A will run the “tag generation” algorithm on M...

A&ruct-Universal coding is any asymptotically opt imum method of block-to-block memoryless source coding for sources with unknown parameters. This paper considers noiseless coding for such sources, primarily in terms of variable-length coding, with performance measured as a function of the coding redundancy relative to the per-letter conditional source entropy given the unknown parameter. It is...

Stochastic approximation methods for variational inference have recently gained popularity in the probabilistic programming community since these are amenable to automation and allow online, scalable, universal approximate Bayesian inference. Unfortunately, common Probabilistic Programming Languages (PPLs) with stochastic engines lack efficiency of message passing-based algorithms deterministic...

An universal forgery attack means that for any given message M , an adversary without the key can forge the corresponding Message Authentication Code (MAC) tag τ , and the pair (M, τ) can be verified with probability 1. For a idea MAC, the universal forgery attack should be infeasible to be implemented, whose complexity is believed to be min(2, 2) queries in the classic setting, where n is the ...

background: mobile phone is one of the most important necessary tools in today’s life which can threaten people’s health in some conditions. the present study was carried out to compare the effect of educational intervention by short message and pamphlet on the behavior of steel factory staff in ardakan, yazd province, iran.materials and methods: the present study was experimentally carried out...

This paper deals with a coding problem called complementary delivery, where messages from two correlated sources are jointly encoded and each decoder reproduces one of two messages using the other message as the side information. Both lossless and lossy universal complementary delivery coding schemes are investigated. In the lossless case, it is demonstrated that a universal complementary deliv...