Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

Problem 1 : On leaking, or hiding, the message length Consider encryption scheme Gen, Enc, Dec ) that is EAV - secure w . r

Problem 1: On leaking, or hiding, the message length
Consider encryption scheme Gen, Enc, Dec) that is EAV-secure w.r.t. the definition in Figure 1.
Figure 1: Indistinguishability of encryptions in the presence of an eavesdropper.
(3) Show that EAV2-security can be achieved by encryption schemes defined over messages up to
a given maximum length, i.e., by schemes ' such that for kin{0,1}n, algorithm Enc ?k' is defined
over message space M'={m:|m|l}, where ll(n) for some given polynomial l(*).
Hint: Construct a scheme '=(Gen',Enc',Dec') that encrypts messages in M' by
employing a EAV-secure scheme Gen, Enc, Dec) with message space M. Consider
an algorithm Enc ?' that on input message m'inM', merely applies Enc on a unique
and inversible encoding m=E(m')inM of m' in a way that "compensates" for the
absence of the restriction |m0|=|m1| in game PrivK-EAV2A,'(n). Then, prove that '
is EAV2-secure via a proof by reduction.
image text in transcribed

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Intelligent Databases Object Oriented Deductive Hypermedia Technologies

Authors: Kamran Parsaye, Mark Chignell, Setrag Khoshafian, Harry Wong

1st Edition

0471503452, 978-0471503453

More Books

Students also viewed these Databases questions

Question

=+ Is the information documented and verifiable?

Answered: 1 week ago

Question

=+ Is the information presented in an objective manner?

Answered: 1 week ago