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Research On Public Key Encryption With Keyword Search

Posted on:2019-07-19Degree:MasterType:Thesis
Country:ChinaCandidate:C MengFull Text:PDF
GTID:2428330566998486Subject:Computer technology
Abstract/Summary:PDF Full Text Request
With the rapid development of Internet,cloud storage and cloud computing with the advantages of remote access service,low cost,high reliability,easy expansion of storage space,much favored by users,has become more and more important in our daily life.However,because the data management of the cloud is divorced from the user 's supervision,a lot of sensitive information is easily leaked.In order to prevent the disclosure of their own private data,the data owner usually encrypts the private data first,and then stores it in the cloud.However,there is a problem of ciphertext retrieval in this way.Public key encryption with keyword search(PEKS)was proposed to solve the search problem of the ciphertext.PEKS scheme can quickly retrieve the ciphertext users want,and can be used in multi-user environment,therefore,suitable for cloud storage environme nt.However,the PEKS scheme can not resist the off-line keyword guesswork(KG)attack,and the keyword information will still be leaked.Although many scholars have improved the PEKS scheme,so far,no PEKS scheme that can resist KG attack has been found.To solve these problems,we will design a PEKS scheme,which not only meets the function of ciphertext searchable in cloud storage,but also resists KG attack.In addition,compared with the similar schemes,it also has some advantages in performance.This thesis investigates the problem of KG attack in the PEKS schemes,and makes a lot of research on the existing PEKS schemes,and finds out the root cause and main reason of the existing security problem.According to the reasons we found,this thesis attacked the first designated server scheme d PEKS and pointed out that all the d PEKS schemes designed by this framework can not resist KG attack.Then,based on the improvement of d PEKS framework,a public key encryption with keyword search scheme RKG-d PEKS is proposed,which uses traditional public key cryptosystem and can resist KG attack.Through mathematical proof and performance comparison experiment,it is proved that the proposed RKG-d PEKS scheme has better security and high performance in the same schemes.Since the certificateless public key cryptosystem has solved the problem of certificate management in the traditional public key cryptosystem,it has higher security and practicability.This thesis also studies the certificateless public key encryption with keyword search schemes(CLPEKS)proposed by many scholars recently.It is found that many CLPEKS schemes are also unable to resist KG attack.Therefore,this thesis carries out a KG attack on the recently proposed scheme SCF-MCLPEKS,verifying that the KG attack problem also exists in the CLPEKS schemes.Then,combining the previously proposed RKG-d PEKS scheme with the certificateless cryptosystem,we propose a certificateless public key encryption with keyword search scheme RKG-d CLPEKS that can resist KG attacks.So far,a secure and practical public key encryption with keyword search scheme for cloud storage has been implemented.Finally,through the mathematical proof and performance comparison,it is proved that the proposed scheme has better security and practicability in the same schemes.
Keywords/Search Tags:searchable encryption, keyword guessing attack, public key encryption, certificateless encryption
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