In most existing CP-ABE schemes, there is only one authority in the system and all the public keys and private keys are issued by this authority, which incurs ciphertext size and computation costs in the encryption an...In most existing CP-ABE schemes, there is only one authority in the system and all the public keys and private keys are issued by this authority, which incurs ciphertext size and computation costs in the encryption and decryption operations that depend at least linearly on the number of attributes involved in the access policy. We propose an efficient multi-authority CP-ABE scheme in which the authorities need not interact to generate public information during the system initialization phase. Our scheme has constant ciphertext length and a constant number of pairing computations. Our scheme can be proven CPA-secure in random oracle model under the decision q-BDHE assumption. When user's attributes revocation occurs, the scheme transfers most re-encryption work to the cloud service provider, reducing the data owner's computational cost on the premise of security. Finally the analysis and simulation result show that the schemes proposed in this thesis ensure the privacy and secure access of sensitive data stored in the cloud server, and be able to cope with the dynamic changes of users' access privileges in large-scale systems. Besides, the multi-authority ABE eliminates the key escrow problem, achieves the length of ciphertext optimization and enhances the effi ciency of the encryption and decryption operations.展开更多
The study of modal auxiliary verbs has been done by comparing modal auxiliary verbs in English with the ones in Chinese qualitatively and quantitatively. The modals in English and in Chinese are statistically analyzed...The study of modal auxiliary verbs has been done by comparing modal auxiliary verbs in English with the ones in Chinese qualitatively and quantitatively. The modals in English and in Chinese are statistically analyzed through their forms and meanings. The data consists of 50 pieces of Chinese prose with their 50 English translation versions called corpus A and 50 pieces of English prose with their Chinese translation versions called corpus B, altogether 200 articles, which represent a type of discourse that is rich in modal auxiliary verbs both in English and in Chinese The major findings are as follows： （1） The three criteria： inversion, negation, and the use of pro-forms can be used to define both English and Chinese auxiliaries; （2） the modals of both languages can be analyzed within the same semantic categories： volition, probability, and necessity; （3） Chinese epistemic modals can have inversion patterns; （4） the negative forms of Chinese modals are more complex than those of English modals; and （5） the statistic analysis shows that the modals in probability category both in English and in Chinese are used much more often compared to the other two categories： volition and necessity and that deontic modals are used much fewer in both languages to express necessity展开更多
This paper argues the sapiential characteristic of an ancient text in the history of early Christianity. Although Thomas is a creative and distinctive text for its own community, the major framework of the Logia in a ...This paper argues the sapiential characteristic of an ancient text in the history of early Christianity. Although Thomas is a creative and distinctive text for its own community, the major framework of the Logia in a textual-statistic way was based on the traditional Sophia literature that had affected the culture, custom, and authority of the Hellenised Jewish societies. Then, what kind of scrolls, books, and writings could be the religio-historical sources for Thomas？ How was Thomas transformed from those sapiential manuscripts？ While three data of ＂the Pauline Sophia concept＂, ＂the sapiential Logia of Q＂, and ＂the sapiential themes of the Jewish apocalyptic writings＂ are quite relevant, the Greek fragment of Papyrus Oxyrhynchus （P. Oxy.） 654 and NHC II, 2.32：10-51：28 will evince the new insight that the ancient Logia of the Thomasine community was not ＂the traditional Q＂, but could be ＂a new Q＂ coming from the common （oral, or written, or both） Sophia tradition, as an independently developed one.展开更多
Singular authorship of＂The Tale of Genji,＂ which is the greatest accomplishment in classical Japanese literature, is doubtful In this study, we statistically analyze whether the author of Uji Jujo, which comprises t...Singular authorship of＂The Tale of Genji,＂ which is the greatest accomplishment in classical Japanese literature, is doubtful In this study, we statistically analyze whether the author of Uji Jujo, which comprises the last ten chapters of the ＂Tale of Ganji,＂ is same as that of other chapters by using statistical analyses such as principal component analysis and random forests. The result of the analyses of word frequency shows that there is no obvious difference in word usage between the ten chapters and others. Thus, we conclude that it is highly possible that the chapters＇ author is same as that of others.展开更多
基金supported by National Natural Science Foundation of China under Grant No.60873231Natural Science Foundation of Jiangsu Province under Grant No.BK2009426+1 种基金Major State Basic Research Development Program of China under Grant No.2011CB302903Key University Science Research Project of Jiangsu Province under Grant No.11KJA520002
文摘In most existing CP-ABE schemes, there is only one authority in the system and all the public keys and private keys are issued by this authority, which incurs ciphertext size and computation costs in the encryption and decryption operations that depend at least linearly on the number of attributes involved in the access policy. We propose an efficient multi-authority CP-ABE scheme in which the authorities need not interact to generate public information during the system initialization phase. Our scheme has constant ciphertext length and a constant number of pairing computations. Our scheme can be proven CPA-secure in random oracle model under the decision q-BDHE assumption. When user's attributes revocation occurs, the scheme transfers most re-encryption work to the cloud service provider, reducing the data owner's computational cost on the premise of security. Finally the analysis and simulation result show that the schemes proposed in this thesis ensure the privacy and secure access of sensitive data stored in the cloud server, and be able to cope with the dynamic changes of users' access privileges in large-scale systems. Besides, the multi-authority ABE eliminates the key escrow problem, achieves the length of ciphertext optimization and enhances the effi ciency of the encryption and decryption operations.
文摘The study of modal auxiliary verbs has been done by comparing modal auxiliary verbs in English with the ones in Chinese qualitatively and quantitatively. The modals in English and in Chinese are statistically analyzed through their forms and meanings. The data consists of 50 pieces of Chinese prose with their 50 English translation versions called corpus A and 50 pieces of English prose with their Chinese translation versions called corpus B, altogether 200 articles, which represent a type of discourse that is rich in modal auxiliary verbs both in English and in Chinese The major findings are as follows： （1） The three criteria： inversion, negation, and the use of pro-forms can be used to define both English and Chinese auxiliaries; （2） the modals of both languages can be analyzed within the same semantic categories： volition, probability, and necessity; （3） Chinese epistemic modals can have inversion patterns; （4） the negative forms of Chinese modals are more complex than those of English modals; and （5） the statistic analysis shows that the modals in probability category both in English and in Chinese are used much more often compared to the other two categories： volition and necessity and that deontic modals are used much fewer in both languages to express necessity
文摘This paper argues the sapiential characteristic of an ancient text in the history of early Christianity. Although Thomas is a creative and distinctive text for its own community, the major framework of the Logia in a textual-statistic way was based on the traditional Sophia literature that had affected the culture, custom, and authority of the Hellenised Jewish societies. Then, what kind of scrolls, books, and writings could be the religio-historical sources for Thomas？ How was Thomas transformed from those sapiential manuscripts？ While three data of ＂the Pauline Sophia concept＂, ＂the sapiential Logia of Q＂, and ＂the sapiential themes of the Jewish apocalyptic writings＂ are quite relevant, the Greek fragment of Papyrus Oxyrhynchus （P. Oxy.） 654 and NHC II, 2.32：10-51：28 will evince the new insight that the ancient Logia of the Thomasine community was not ＂the traditional Q＂, but could be ＂a new Q＂ coming from the common （oral, or written, or both） Sophia tradition, as an independently developed one.
文摘Singular authorship of＂The Tale of Genji,＂ which is the greatest accomplishment in classical Japanese literature, is doubtful In this study, we statistically analyze whether the author of Uji Jujo, which comprises the last ten chapters of the ＂Tale of Ganji,＂ is same as that of other chapters by using statistical analyses such as principal component analysis and random forests. The result of the analyses of word frequency shows that there is no obvious difference in word usage between the ten chapters and others. Thus, we conclude that it is highly possible that the chapters＇ author is same as that of others.
