MAS328 cipher challenge (2012-2013)

Akleylek et al. [S. Akleylek, L. Emmungil and U. Nuriyev, A modified algorithm for peer-to-peer security, journal of Appl. Comput. Math., vol. 6(2), pp. 258-264, 2007.], introduced a modified public-key encryption scheme with steganographic approach for security in peer-to-peer (P2P) networks. In this cryptosystem, Akleylek et al. attempt to increase security of the P2P networks by mixing ElGamal cryptosystem with knapsack problem. In this paper, we present a ciphertext-only attack against their system to recover message. In addition, we show that for their scheme completeness property is not holds, and therefore, the receiver cannot uniquely decrypts messages. Furthermore, we also show that this system is not chosen-ciphertext secure, thus the proposed scheme is vulnerable to man-in-the-middle-attack, one of the most pernicious attacks against P2P networks. Therefore, this scheme is not suitable to implement in the P2P networks. We modify this cryptosystem in order to increase its security and efficiency. Our construction is the efficient CCA2-secure variant of the Akleylek et al.'s encryption scheme in the standard model, the de facto security notion for public-key encryption schemes.

2016

This book has been typeset using the LaTeX document preparation system, the XeTeX engine and the TikZ graphics package. The text has been mostly set to the TeX Gyre font family, in particular TeX Gyre Pagella, TeX Gyre Heros, and TeX Gyre Cursor, with the exception of Cyrillic text, which has been set to Linux Libertine, and Japanese text, which has been set to Utsukushi Mincho. Mathematical formulas are set to TeX Gyre Pagella Math, with the mathematical calligraphic symbols from XITS Math, and a few more individual symbols taken from the newpxmath and the AMS Math fonts.

International Journal for Research in Applied Science and Engineering Technology IJRASET, 2020

This document gives an overview of solving the limitations of cipher text formatting while implementing cryptography techniques on computers. The Manna Cipher uses the numbering system to represent ciphers rather than alphanumeric characters. The aim is to create a ciphering standard which is painstakingly difficult to crack even using the latest super computers. This document will be focusing on the plain text the resultant cipher text and the run time to have a fair idea about the performance.

Turkiye Klinikleri Journal of Medical Ethics Law and History, 2006

Cryptologia

Problems and their solutions of the Fifth International Students' Olympiad in cryptography NSUCRYPTO'2018 are presented. We consider problems related to attacks on ciphers and hash functions, Boolean functions, quantum circuits, Enigma, etc. We discuss several open problems on orthogonal arrays, Sylvester matrices and disjunct matrices. The problem of existing an invertible Sylvester matrix whose inverse is again a Sylvester matrix was completely solved during the Olympiad.

Raqs Media Collective: A Casebook , 2014

"This book documents roughly 80 artworks and projects by the Raqs Media Collective that were undertaken from 2002 through 2012. Ranging from full-scale curatorial projects through to individual prints, these projects are documented in aphoristic ‘Annotations’ and iconic images, and are further elucidated with essays from past collaborators, including Svetlana Boym, Kaushik Bhowmik, Alexander Keefe, Anders Kreuger, Molly Nesbit, Hans Ulrich Obrist, Parul Dave Mukherji, Jonathan Watkins, Elena Bernardini, Srinivas Aditya Mopidevi, Cuauhtemoc Medina, Theodor Ringborg, and Cedric Vincent. " -- publisher's website