Guess-and-determine attack is one of the general attacks on stream ciphers. It is a common cryptanalysis tool for evaluating security of stream ciphers. The effectiveness of this attack is based on the number of unknown bits which will be guessed by the attacker to break the cryptosystem. In this work, we present a relation between the minimum numbers of the guessed bits and uniquely restricted...

Passage-level question answer matching is a challenging task since it requires effective representations that capture the complex semantic relations between questions and answers. In this work, we propose a series of deep learning models to address passage answer selection. To match passage answers to questions accommodating their complex semantic relations, unlike most previous work that utili...

This paper describes the Question and Answering system participating Question Answering track in Text Analysis Conference organized by National Institute of Standard and Technology 2008. Our Question and Answering system attempts to use a human style of logic to search their respective document sources and return possible answers to a question.

This paper presents different ways at different steps of question answering process to improve question answer match. First we discuss about the role and the importance of question categorization to guide the pairing. In order to process linguistic criteria, we describe a question pattern based categorization. Then we propose a statistical method and a linguistic method to enhance the pairing p...

In recent years, Question Answering (QA) systems have gained popularity as a means of acquiring knowledge. However, the prevalent approach matching question-answer pairs still suffers from low precision and efficiency due to inherent ambiguity natural language descriptions. To address these issues, we propose novel QA based on hierarchical semantic matching, termed HSM-QA. Specifically, HSM-QA ...

AnswerFinder combines lexical, syntactic, and semantic information in various stages of the question answering process. The candidate sentences are preselected on the basis of (i) the presence of named entity types compatible with the expected answer type, and (ii) a score combination of the overlap of words, grammatical relations, and flat logical forms. The candidate answers, in turn, are ext...

In NTCIR-7, ACLIA task focus on more complex questions than factoid ones. To participate in Monolingual Chinese task, we propose a multi-strategy QA system that can handle questions with different types. Basic steps of this system are described as follow: first, pattern-based question type analysis is performed to classify questions of four types, then an Information Retrieval method is utilize...