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نتیجه جستجو - Public key encryption with equality test

تعداد مقالات یافته شده: 3
ردیف عنوان نوع
1 Public key encryption with equality test via hash proof system
رمزگذاری کلید عمومی با آزمایش برابری از طریق سیستم اثبات هش-2019
Public key encryption with equality test (PKEET) allows a tester to know whether ciphertexts are the encryptions of a same message or not by using the trapdoors issued from their owners, which is a useful cryptographic primitive can be deployed in many applications, such as in the mechanism of searching over encrypted data. Based on Hash Proof System (HPS) introduced by Cramer and Shoup, this paper presents an oversimplified paradigm for constructing PKEET in the standard model. Compared with the previous works that use identity-based encryption, strongly unforgeable one-time signature or other strong cryptographic primitives, our paradigm requires only the universal2property of HPS and provides an efficient way to obtain concrete PKEET schemes based on different assumptions in the standard model, since HPS has been shown can be easily realized from a board range of NPlanguages (e.g., DLIN-based, DCR-based, Lattice-based and so on). Moreover, to demonstrate the practicality of the proposed paradigm, we instantiate it based on two kinds of NPlanguages respectively, one is based on the decisional Diffie-Hellman (DDH) assumption, the other one is based on the decisional composite residuosity (DCR) assumption, which results in the first concrete PKEET schemes that in the standard model without using pairing operations, and the schemes’ security are also based on the standard DDH assumption and the standard DCR assumption respectively.
Keywords: Public key encryption | Public key encryption with equality test | Standard model | Hash proof system
مقاله انگلیسی
2 Public key encryption with equality test from generic assumptions in the random oracle model
رمزگذاری کلید عمومی با آزمون برابری از مفروضات عمومی در مدل اوراکل تصادفی-2019
Public key encryption with equality test (PKEET) is a variant of classical public key en- cryption (PKE) with the special functionality of an equality test, and can be used in many applications such as in keyword search on encrypted data and for efficient management by partitioning encrypted data in the cloud. Since the original proposal of Yang et al. (CT-RSA, 2010), several subsequent proposals to improve the efficiency or functionality of PKEET have been reported. We present a PKEET construction from generic assumptions in the random oracle model. In particular, whereas previous results require number-theoretic assumptions or strictly stronger generic assumptions such as the existence of secure hierarchical identity-based encryption, our proposal requires only the existence of cryptographic hash functions and secure PKE schemes satisfying a special property, called randomness extractability . Infor- mally, randomness extractability means that one can recover the randomness used in a ciphertext when given a secret key corresponding to a public key for the ciphertext. We investigate the fact that PKE schemes satisfying this property can be designed by the Fujisaki-Okamoto (FO) transformation, which is the widely utilized method to obtain se- cure PKE schemes from basic cryptographic primitives in the random oracle model. As a result, in combination with the FO transformation, we obtain a PKEET construction in the random oracle model if there exist a one-way PKE scheme, a one-time secure symmet- ric key encryption scheme, collision-resistant and one-way hash functions, and a pseudo- random function. In this sense, we remark that our PKEET construction is derived from fundamental generic assumptions only.
Keywords: Public key encryption | Equality test | Random oracle model
مقاله انگلیسی
3 Somewhat semantic secure public key encryption with filtered-equality-test in the standard model and its extension to searchable encryption
رمزنگاری عمومی کلید امنیتی معقولانه با تست برابری فیلتر شده در مدل استاندارد و گسترش آن به رمزنگاری قابل جستجو-2017
Public key encryption with equality test (PKE-ET) is a public key encryption with an extra functionality, so-called ‘equality test’. An authorized third party can verify the equivalence between two ciphertexts encrypted under different public keys, while the decryption keeps unavailable. However, the privacy of most existing PKE-ET schemes drop to one-way security owing to the ‘equality test’ functionality. In this work, we propose a novel architecture called filtered equality test (FET), which ‘filtered’ denotes only few receiver-selected messages can be equality tested. In such model, we propose an equality test scheme, PKE-FET, which is the first one to be proved (somewhat) semantic secure. The concrete PKE-FET scheme and its rigorous security proof in the standard model are proposed. Furthermore, FET is also applied to construct a searchable encryption named PE MKS, which is inherently proved semantic secure (so called the indistinguishability against chosen keyword attacks) in the standard model.
Keywords: Computation over ciphertext | Equality test | Searchable encryption | Semantic security | Standard model
مقاله انگلیسی
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