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keyword-based search technologies. At last, we propose a novel color-based keyword search scheme for encrypted office document. Two vectors on behalf of the keywords and the corresponding color are used. The scheme can return top-k set as correct as possible meeting user's requirements.
efficient solutions over encrypted documents remains difficult. In this paper, we investigate the problem of processing a large amount of encrypted documents in XML-like formats where a user may wish to search or compute based on certain elements in the XML tree. Our solution makes use of index tables to allow for fast keyword
digital signature — in an integrated, embedded, and fine-grained manner, based on open standards such as eXtensible Access Control Markup Language, XML Encryption, XML Signature, and XML Key Management Specification. To support patient-controlled encryption and privacy-preserving keyword search, we use ciphertext
, we have used Vigenere cipher which is not monoalphabetic, then the number of possible keywords of length m in a Vigenere Cipher is 26m, so even for relatively small values of m, an exhaustive key search would require a long time.
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