Amal Hashim

26 Questions 9 Answers 0 Followers

Questions related from Amal Hashim

What is the different encryption methods used to encrypt inverted index?

create inverted index which consist of words mapping to files contain this words. then i want to encrypt this inverted index by using some encryption algorithm.

08 August 2019 3,737 7 View

What is the complexity time of ciphertext policy attribute based encryption?

When i compute the time complexity of cipher text policy attribute based encryption CP-ABE . I found it O(1) by tracing each step in code which mostly are assignments operations. Is it possible...

06 June 2019 4,247 6 View

Can any one provide me with example that explain the RC2 encryption algorithm?

iam already read about RC2 encryption algorithm but for mor explanation , i want an example that explain the algorithm.

07 July 2018 304 0 View

How compute true positive, false positive, true negative and false negative in searchable encryption?

iam working in searching encrypted data, then retrieving from this data. i want to compute precision and recall so i want to know the formula to compute true positive , false positive , true...

04 April 2018 7,389 8 View

How solve the following exception when compute inverse of matrix of big length in java?

i write code contain vector of legth 1000 that vector split into two vectors of same length follow specific algorithm , this two vectors multiply into inverse of two matrices that should be the...

02 February 2018 9,033 5 View

Can any one help me in solve that problem in encryption?

iam working in searchable encryption. first i make index for set of files, the index is B+ tree , the leaf of this tree is bloom filter which represent the words in each file. each bloom filter...

10 October 2017 6,009 2 View

What is the technique used to encrypt hashmap represent binary vector?

I have binary vector of 0s and 1s that i want to encrypt it then make search in it. First i convert vector into hashmap Which key represent index of each dimension in this vector and value...

10 October 2017 4,179 2 View

How to implement Pseudo Random Function in java?

i want to implement Pseudo Random Function for these two functions in java: f(sk,.)={0,1}^* multiply sk ---> {0,1}^k, where sk is secret key (a random key). g(.,.)= {0,1}^k multiply {0,1}...

07 July 2017 4,508 3 View

How can i make develop in the following euclidean hash class in java?

in the following code in euclidean hash some of the result of the rand.nextGaussian() implementation is negative when set dimension 100 and w is 2. which affect in the hash method. public...

07 July 2017 2,681 5 View

Can anyone help me understand how to encrypt inner nodes of bloom filter as explained in the following paper?

he paper propose scheme for search in encrypted data using the tree of bloom filters as data structure to represent the index of the files then encrypted the leaves of the tree which consist of...

06 June 2017 1,591 2 View

How encrypt index consist of tree of bloom filters ( as tree represent index of files and bloom filter represent keywords of each file ) in java?

Iam working in searching encrypted data and made index of files consist of b+tree of bloom filters in its nodes . And I want to encrypt the tree and bloom filter to make search in it.

02 February 2017 3,932 1 View

Is there any Java implementation (API) available for Ciphertext-Policy Attribute-Based Encryption or for Attribute-Based Encryption?

iam working in searching encrypted data in cloud computing and i want to combine attribute based encryption with searchable encryption , i search for java library implementing ciphertext policy...

07 July 2016 3,607 8 View

What is the best neural network algorithm used as index in information retrieval system?

i want to create index in the form of neural network consist of query terms as input neurons and keywords as hidden neurons and documents id as output neurons.

05 May 2016 7,253 3 View

Can anyone explain to me a mathematical example for locality sensitive hashing functions?

i know that Locality-Sensitive Hashing (LSH) is an algorithm for solving the approximate or exact Near Neighbor Search in high dimensional spaces.

05 May 2016 5,212 4 View

Is it possible to applied map-reduce algorithm on inverted index for data not big data about 1500 documents or it is not efficient?

as i know inverted index consist of keywords and the document identifiers contain this keyword and the search on this index structure is sequential for single keyword search but if i want to...

05 May 2016 2,653 4 View

Can anyone tell me a novel approach used for searching encrypted data stored in cloud computing?

i want to work in cloud computing as a part of my research work. seeking an advise on the research area in searchable encryption in cloud computing.

04 April 2016 4,303 12 View

What is the best for using in implementation to create index and perform search to retrieve data stored in cloud computing?

I am lost in : Hadoop, Solr, Cloudera, Carrot2, Hesse and Lucence. If you could help me narrow this set for my particular scenario it would be great. I am not sure which of the above will fit...

12 December 2015 8,763 1 View

In attached screenshot what mean by hash function are true permutations?

when computing minhash function make some permutations in set then generate minhash signature.

01 January 2015 3,315 0 View

In attached file public key encryption with keyword search why using two hash functions H1,H2 and what is mean by trapdoor word or key ?

i understood that H1 transform word into trapdoor and H2 transform trapdoor into PEKS or what ?

12 December 2014 9,037 1 View

In the attached screenshot, is mean by epsilon and qT and qH2 positive small number? why compute epsilon' by dividing it on qTqH2?

in paper public key encryption with keyword search i read that attack algorithm has epsilon advantage and make qH hash function and make qT trapdoor queries.

12 December 2014 8,833 1 View

What does is mean by'source indistinguishable and negligible function "?

I read in public key encryption with keyword search in construction trapdoor 'permutation source indistinguishable "can any one tell me what this mean?

12 December 2014 9,778 0 View

In public key encryption with keyword search what this sentence mean "BDH is intractable if all polynomial time algorithms have negligible advantage ?

"Billinear Diffie Hellman is intractable if all polynomial time algorithms have a negligible advantage in solving BDH"?

12 December 2014 7,760 0 View

In public key encryption with keyword search in Test how come that H2(e(Tw,A))=t ?

in public key encryption with keyword search PEKS in Test i note that :Test state that if H2(e(Tw,A))=B when see to lift side e(Tw,A) that Tw=H1(w)^priv and A=g^r so e(Tw,A)=(H1(w)^priv,g^r) when...

12 December 2014 7,103 0 View

In public key encryption with keyword search in PEKS algorithm in TEST what does A and B refer to?

When testing between trapdoor and PEKS what is A and B mean?

12 December 2014 3,047 1 View

In public key encryption epsilon'=epsilon/(eqTqH2) why using e here?why compute epsilon' in the following form?Is qT,qH2,epsilon mean integer num?

in attached theorm qT mean A algorithm make at most qT trapdoor query. qH2 mean A make at most qH2 hash function query. e is the base of natural logarithm. €' is possibility of success of...

12 December 2014 1,705 0 View

attached paper public key encryption with keyword search PEKS how prove claim3?can anyone explain this claim?how come 1/2 and what mean by 2epsilon?

In claim 3 how prove and what symbols in this claim mean?

12 December 2014 173 1 View