Editing
Quantum Private Queries Protocol Based on Quantum Oblivious Key Distribution
(section)
Jump to navigation
Jump to search
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
==Outline== <!-- A non-mathematical detailed outline which provides a rough idea of the concerned protocol --> ''A user, Alice, wants to retrieve an element from a database owned by a server, Bob, without revealing to Bob which element was retrieved (user privacy). Bob wants the amount of information that Alice can get on other database elements than the desired one to be bounded (data privacy).''<br></br> *'''Quantum oblivious key distribution:''' Alice and Bob perform a [[Quantum Key Distribution|quantum key distribution]] (QKD) protocol in such a way that at the end of the protocol, Alice and Bob share a bit string known entirely to Bob and in a quarter to Alice: such a protocol is referred to as [[Quantum Oblivious Key Distribution|quantum ''oblivious'' key distribution]]. Then the key length is reduced to match the size of the database, while ensuring that Alice knows approximately one bit of the new key (the position of the known bit is unknown to Bob).<br></br> *'''Query:''' Alice announces to Bob a (classical) shift corresponding to the difference between the index of the known bit of the key and the index of the desired database element.<br></br> *'''Answer:''' Bob encodes the database by bitwise adding the key, shifted by Alice’s shift. Then Bob announces the encoded database.<br></br> *'''Retrieval:''' By adding bitwise the shifted key to the encoded database, Alice can recover each database element for which she knew the corresponding (shifted) bit of the key.
Summary:
Please note that all contributions to Quantum Protocol Zoo may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see
Quantum Protocol Zoo:Copyrights
for details).
Do not submit copyrighted work without permission!
To protect the wiki against automated edit spam, we kindly ask you to solve the following CAPTCHA:
Cancel
Editing help
(opens in new window)
Navigation menu
Personal tools
Not logged in
Talk
Contributions
Log in
Namespaces
Page
Discussion
English
Views
Read
Edit
View history
More
Search
Navigation
Main page
News
Protocol Library
Certification Library
Nodal Subroutines
Codes Repository
Knowledge Graphs
Submissions
Categories
Supplementary Information
Recent Changes
Contact us
Help
Tools
What links here
Related changes
Special pages
Page information