Wireless Fever!
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Improved Rectangle Attacks on SKINNY and CRAFT
Improved Rectangle Attacks on SKINNY and CRAFT Hosein Hadipour1, Nasour Bagheri2 and Ling Song3( ) 1 Department of Mathematics and Computer Science, University of Tehran, Tehran, Iran, [email protected] 2 Electrical Engineering Department, Shahid Rajaee Teacher Training University, Tehran, Iran, [email protected] 3 Jinan University, Guangzhou, China [email protected] Abstract. The boomerang and rectangle attacks are adaptions of differential crypt- analysis that regard the target cipher E as a composition of two sub-ciphers, i.e., 2 2 E = E1 ◦ E0, to construct a distinguisher for E with probability p q by concatenat- ing two short differential trails for E0 and E1 with probability p and q respectively. According to the previous research, the dependency between these two differential characteristics has a great impact on the probability of boomerang and rectangle distinguishers. Dunkelman et al. proposed the sandwich attack to formalise such dependency that regards E as three parts, i.e., E = E1 ◦ Em ◦ E0, where Em contains the dependency between two differential trails, satisfying some differential propagation with probability r. Accordingly, the entire probability is p2q2r. Recently, Song et al. have proposed a general framework to identify the actual boundaries of Em and systematically evaluate the probability of Em with any number of rounds, and applied their method to accurately evaluate the probabilities of the best SKINNY’s boomerang distinguishers. In this paper, using a more advanced method to search for boomerang distinguishers, we show that the best previous boomerang distinguishers for SKINNY can be significantly improved in terms of probability and number of rounds. -
SSA/CHICAGO at the University of Chicago
A publication by students of the School of Social Service Administration SSA/CHICAGO at the University of Chicago Advocates’ FORUM 2006 Advocates’ FORUM 2006 COEDITORS IN CHIEF Charlotte Hamilton Amy Proger EDITORIAL BOARD Vanessa Askot Stephen Brehm Marianne Cook Jessica Falk Charlotte Hamilton Christina James Amy Proger Liz Schnitz Marion Scotchmer Aaron Willis ADVISOR Virginia Parks, Ph.D. MISSION STATEMENT Advocates’ Forum is an academic journal that explores clinical implications, social issues, admin- istration, and public policies linked to the social work profession. The journal is written, edited, and ESSAYS AND ARTICLES created by students of the School of Social Service Administration, Mapping the American Political Stream: and its readership includes current The Stuart B. McKinney Homeless Assistance Act students, alumni, faculty, fieldwork by Betsy Carlson . 6 supervisors, and other professionals in the field. The editors of Advocates’ The Stink beneath the Ink: How Cartoons Are Forum seek to provide a medium through which SSA students Animating the Gay and Lesbian Culture Wars can contribute to the continuing by Frank Baiocchi . 16 discourse on social welfare and policy. Those of a Queer Age: Insights into Aging in the Gay and Lesbian Community EDITORIAL POLICY by Stephanie Schmitz-Bechteler . 26 Advocates’ Forum is published by the students of the School of Transgender Inclusion and Feminism: Social Service Administration Organizations and Innovation (SSA) at the University of Chicago. by Katherine S. Stepleton . 37 Submissions to the journal are selected by the editorial board from An Introduction to the Client-Oriented, Practical, works submitted by SSA students and edited in an extensive revision Evidence Search (COPES) process with the authors’ permis- by Aaron Willis and Andrew Gill . -
Hardware Performance Evaluation of Authenticated Encryption SAEAES with Threshold Implementation
cryptography Article Hardware Performance Evaluation of Authenticated Encryption SAEAES with Threshold Implementation Takeshi Sugawara Department of Informatics, The University of Electro-Communications, Tokyo 182-8585, Japan; [email protected] Received: 30 June 2020; Accepted: 5 August 2020; Published: 9 August 2020 Abstract: SAEAES is the authenticated encryption algorithm instantiated by combining the SAEB mode of operation with AES, and a candidate of the NIST’s lightweight cryptography competition. Using AES gives the advantage of backward compatibility with the existing accelerators and coprocessors that the industry has invested in so far. Still, the newer lightweight block cipher (e.g., GIFT) outperforms AES in compact implementation, especially with the side-channel attack countermeasure such as threshold implementation. This paper aims to implement the first threshold implementation of SAEAES and evaluate the cost we are trading with the backward compatibility. We design a new circuit architecture using the column-oriented serialization based on the recent 3-share and uniform threshold implementation (TI) of the AES S-box based on the generalized changing of the guards. Our design uses 18,288 GE with AES’s occupation reaching 97% of the total area. Meanwhile, the circuit area is roughly three times the conventional SAEB-GIFT implementation (6229 GE) because of a large memory size needed for the AES’s non-linear key schedule and the extended states for satisfying uniformity in TI. Keywords: threshold implementation; SAEAES; authenticated encryption, side-channel attack; changing of the guards; lightweight cryptography; implementation 1. Introduction There is an increasing demand for secure data communication between embedded devices in many areas, including automotive, industrial, and smart-home applications. -
Hash Functions and the (Amplified) Boomerang Attack
Hash Functions and the (Amplified) Boomerang Attack Antoine Joux1,3 and Thomas Peyrin2,3 1 DGA 2 France T´el´ecomR&D [email protected] 3 Universit´ede Versailles Saint-Quentin-en-Yvelines [email protected] Abstract. Since Crypto 2004, hash functions have been the target of many at- tacks which showed that several well-known functions such as SHA-0 or MD5 can no longer be considered secure collision free hash functions. These attacks use classical cryptographic techniques from block cipher analysis such as differential cryptanal- ysis together with some specific methods. Among those, we can cite the neutral bits of Biham and Chen or the message modification techniques of Wang et al. In this paper, we show that another tool of block cipher analysis, the boomerang attack, can also be used in this context. In particular, we show that using this boomerang attack as a neutral bits tool, it becomes possible to lower the complexity of the attacks on SHA-1. Key words: hash functions, boomerang attack, SHA-1. 1 Introduction The most famous design principle for dedicated hash functions is indisputably the MD-SHA family, firstly introduced by R. Rivest with MD4 [16] in 1990 and its improved version MD5 [15] in 1991. Two years after, the NIST publishes [12] a very similar hash function, SHA-0, that will be patched [13] in 1995 to give birth to SHA-1. This family is still very active, as NIST recently proposed [14] a 256-bit new version SHA-256 in order to anticipate the potential cryptanalysis results and also to increase its security with regard to the fast growth of the computation power. -
The Arrival of the First Film Sound Systems in Spain (1895-1929)
Journal of Sound, Silence, Image and Technology 27 Issue 1 | December 2018 | 27-41 ISSN 2604-451X The arrival of the first film sound systems in Spain (1895-1929) Lidia López Gómez Universitat Autònoma de Barcelona [email protected] Date received: 10-01-2018 Date of acceptance: 31-03-2018 PALABRAS CLAVE: CINE MUDO | SONIDO | RecepcIÓN | KINETÓFONO | CHRONOPHONE | PHONOFILM KEY WORDS: SILENT FILM | SOUND | RecepTION | KINETOPHONE | CHRONOPHONE | PHONOFILM Journal of Sound, Silence, Image and Technology | Issue 1 | December 2018. 28 The arrival of the first film sound systems in spain (1895-1929) ABSTracT During the final decade of the 19th century, inventors such as Thomas A. Edison and the Lumière brothers worked assiduously to find a way to preserve and reproduce sound and images. The numerous inventions conceived in this period such as the Kinetophone, the Vitascope and the Cinematograph are testament to this and are nowadays consid- ered the forerunners of cinema. Most of these new technologies were presented at public screenings which generated a high level of interest. They attracted people from all social classes, who packed out the halls, theatres and hotels where they were held. This paper presents a review of the newspa- per and magazine articles published in Spain at the turn of the century in order to study the social reception of the first film equip- ment in the country, as well as to understand the role of music in relation to the images at these events and how the first film systems dealt with sound. Journal of Sound, Silence, Image and Technology | Issue 1 | December 2018. -
Boomerang Analysis Method Based on Block Cipher
International Journal of Security and Its Application Vol.11, No.1 (2017), pp.165-178 http://dx.doi.org/10.14257/ijsia.2017.11.1.14 Boomerang Analysis Method Based on Block Cipher Fan Aiwan and Yang Zhaofeng Computer School, Pingdingshan University, Pingdingshan, 467002 Henan province, China { Fan Aiwan} [email protected] Abstract This paper fused together the related key analysis and differential analysis and did multiple rounds of attack analysis for the DES block cipher. On the basis of deep analysis of Boomerang algorithm principle, combined with the characteristics of the key arrangement of the DES block cipher, the 8 round DES attack experiment and the 9 round DES attack experiment were designed based on the Boomerang algorithm. The experimental results show that, after the design of this paper, the value of calculation complexity of DES block cipher is only 240 and the analysis performance is greatly improved by the method of Boomerang attack. Keywords: block cipher, DES, Boomerang, Computational complexity 1. Introduction With the advent of the information society, especially the extensive application of the Internet to break the traditional limitations of time and space, which brings great convenience to people. However, at the same time, a large amount of sensitive information is transmitted through the channel or computer network, especially the rapid development of e-commerce and e-government, more and more personal information such as bank accounts require strict confidentiality, how to guarantee the security of information is particularly important [1-2]. The essence of information security is to protect the information system or the information resources in the information network from various types of threats, interference and destruction, that is, to ensure the security of information [3]. -
Rotational Cryptanalysis of ARX
Rotational Cryptanalysis of ARX Dmitry Khovratovich and Ivica Nikoli´c University of Luxembourg [email protected], [email protected] Abstract. In this paper we analyze the security of systems based on modular additions, rotations, and XORs (ARX systems). We provide both theoretical support for their security and practical cryptanalysis of real ARX primitives. We use a technique called rotational cryptanalysis, that is universal for the ARX systems and is quite efficient. We illustrate the method with the best known attack on reduced versions of the block cipher Threefish (the core of Skein). Additionally, we prove that ARX with constants are functionally complete, i.e. any function can be realized with these operations. Keywords: ARX, cryptanalysis, rotational cryptanalysis. 1 Introduction A huge number of symmetric primitives using modular additions, bitwise XORs, and intraword rotations have appeared in the last 20 years. The most famous are the hash functions from MD-family (MD4, MD5) and their descendants SHA-x. While modular addition is often approximated with XOR, for random inputs these operations are quite different. Addition provides diffusion and nonlinearity, while XOR does not. Although the diffusion is relatively slow, it is compensated by a low price of addition in both software and hardware, so primitives with relatively high number of additions (tens per byte) are still fast. The intraword rotation removes disbalance between left and right bits (introduced by the ad- dition) and speeds up the diffusion. Many recently design primitives use only XOR, addition, and rotation so they are grouped into a single family ARX (Addition-Rotation-XOR). -
Cryptanalysis of a Reduced Version of the Block Cipher E2
Cryptanalysis of a Reduced Version of the Block Cipher E2 Mitsuru Matsui and Toshio Tokita Information Technology R&D Center Mitsubishi Electric Corporation 5-1-1, Ofuna, Kamakura, Kanagawa, 247, Japan [email protected], [email protected] Abstract. This paper deals with truncated differential cryptanalysis of the 128-bit block cipher E2, which is an AES candidate designed and submitted by NTT. Our analysis is based on byte characteristics, where a difference of two bytes is simply encoded into one bit information “0” (the same) or “1” (not the same). Since E2 is a strongly byte-oriented algorithm, this bytewise treatment of characteristics greatly simplifies a description of its probabilistic behavior and noticeably enables us an analysis independent of the structure of its (unique) lookup table. As a result, we show a non-trivial seven round byte characteristic, which leads to a possible attack of E2 reduced to eight rounds without IT and FT by a chosen plaintext scenario. We also show that by a minor modification of the byte order of output of the round function — which does not reduce the complexity of the algorithm nor violates its design criteria at all —, a non-trivial nine round byte characteristic can be established, which results in a possible attack of the modified E2 reduced to ten rounds without IT and FT, and reduced to nine rounds with IT and FT. Our analysis does not have a serious impact on the full E2, since it has twelve rounds with IT and FT; however, our results show that the security level of the modified version against differential cryptanalysis is lower than the designers’ estimation. -
Yearbook 2008 African
AFRI Yearbook 2008 CAN M E DI A AFRIcan , AFRI , CAN MEDIA, C H ILDR AFRIcan The International Clearinghouse EN on Children, Youth and Media Norma Pecora, Enyonam Osei-Hwere & Ulla Carlsson CHILDRen NORDICOM Nordic Information Centre for Media and Communication Research University of Gothenburg Editors: Box 713, SE 405 30 Göteborg, Sweden Norma Pecora, Enyonam Osei-Hwere & Ulla Carlsson Telephone: +46 31 786 00 00 Fax: +46 31 786 46 55 E-mail: nordicom @nordicom.gu.se www.nordicom.gu.se WITH AN INTRODUCTIon BY FIRDOZE BULBULIA ISBN 978-91-89471-68-9 The International Clearinghouse on Children, Youth and Media NORDICOM University of Gothenburg Yearbook 2008 The International The International Clearinghouse Clearinghouse on Children, Youth and Media, at on Children, Youth and Media A UNESCO INITIATIVE 1997 Nordicom University of Gothenburg Box 713 SE 405 30 GÖTEBORG, Sweden In 1997, the Nordic Information Centre for Media Web site: and Communication Research (Nordicom), Göteborg www.nordicom.gu.se/clearinghouse University Sweden, began establishment of the International Clearinghouse on Children, Youth DIRECTOR: Ulla Carlsson and Media. The overall point of departure for the SCIENTIFIC CO-ORDINATOR: Clearinghouse’s efforts with respect to children, youth Cecilia von Feilitzen Tel:+46 8 608 48 58 and media is the UN Convention on the Rights of the Fax:+46 8 608 46 40 Child. [email protected] The aim of the Clearinghouse is to increase INFORMATION CO-ORDINATOR: awareness and knowledge about children, youth and Catharina Bucht media, thereby providing a basis for relevant policy- Tel: +46 31 786 49 53 making, contributing to a constructive public debate, Fax: +46 31 786 46 55 [email protected] and enhancing children’s and young people’s media literacy and media competence. -
NHPTV Ready to Learn Enhance Learning with the Learning Triangle
Enhance Learning with the Learning Triangle We all have different learning styles: Visual (what we see) Auditory (what we hear) Tactile/kinesthetic (what we feel or do) The VIEW-READ-DO Learning Triangle combines all three by using related video, books, and activities about any theme or subject. The first step is to videotape children’s programs so that you can: preview; show at your convenience; watch over and over; and use as an effective teaching and learning tool by being able to cue, pause or stop, fast forward and rewind the tape. You can show specific short segments, discuss with children what they see, have them predict what might come next, explain new vocabulary words, and relate to a child’s own experiences. Visit www.nhptv.org/programs.schedule.asp for program schedule and a brief description of episode content and focus. Then, find age-appropriate books to read aloud and plan activites for children to do--draw pictures, act out or retell the story, projects, field trips. Add the Learning Triangle to your teaching toolbox. NHPTV Ready To Learn Pat VanWagoner, RTL Coordinator, (603) 868-4352, [email protected] Nancy Pearson, Education Assistant, (603) 868-4353, [email protected] FAX: (603) 868-7552 Web Site: www.nhptv.org/rtl Ready To Learn Education Partners: Norwin S. & Elizabeth Bean Foundation, The Byrne Foundation, Benjamin Couch Trust, Jefferson Pilot Financial, The Linden Foundation, Samuel P. Pardoe Foundation, and Verizon. “The contents of this newsletter are supported under the Ready-To-Learn Television Program, P/R Award Number R295A00002, as administered by the Office of Educational Research and Improvement, U.S. -
Historical Ciphers • A
ECE 646 - Lecture 6 Required Reading • W. Stallings, Cryptography and Network Security, Chapter 2, Classical Encryption Techniques Historical Ciphers • A. Menezes et al., Handbook of Applied Cryptography, Chapter 7.3 Classical ciphers and historical development Why (not) to study historical ciphers? Secret Writing AGAINST FOR Steganography Cryptography (hidden messages) (encrypted messages) Not similar to Basic components became modern ciphers a part of modern ciphers Under special circumstances modern ciphers can be Substitution Transposition Long abandoned Ciphers reduced to historical ciphers Transformations (change the order Influence on world events of letters) Codes Substitution The only ciphers you Ciphers can break! (replace words) (replace letters) Selected world events affected by cryptology Mary, Queen of Scots 1586 - trial of Mary Queen of Scots - substitution cipher • Scottish Queen, a cousin of Elisabeth I of England • Forced to flee Scotland by uprising against 1917 - Zimmermann telegram, America enters World War I her and her husband • Treated as a candidate to the throne of England by many British Catholics unhappy about 1939-1945 Battle of England, Battle of Atlantic, D-day - a reign of Elisabeth I, a Protestant ENIGMA machine cipher • Imprisoned by Elisabeth for 19 years • Involved in several plots to assassinate Elisabeth 1944 – world’s first computer, Colossus - • Put on trial for treason by a court of about German Lorenz machine cipher 40 noblemen, including Catholics, after being implicated in the Babington Plot by her own 1950s – operation Venona – breaking ciphers of soviet spies letters sent from prison to her co-conspirators stealing secrets of the U.S. atomic bomb in the encrypted form – one-time pad 1 Mary, Queen of Scots – cont. -
The QARMA Block Cipher Family
The QARMA Block Cipher Family Almost MDS Matrices Over Rings With Zero Divisors, Nearly Symmetric Even-Mansour Constructions With Non-Involutory Central Rounds, and Search Heuristics for Low-Latency S-Boxes Roberto Avanzi Qualcomm Product Security, Munich, Germany [email protected], [email protected] Abstract. This paper introduces QARMA, a new family of lightweight tweakable block ciphers targeted at applications such as memory encryption, the generation of very short tags for hardware-assisted prevention of software exploitation, and the con- struction of keyed hash functions. QARMA is inspired by reflection ciphers such as PRINCE, to which it adds a tweaking input, and MANTIS. However, QARMA differs from previous reflector constructions in that it is a three-round Even-Mansour scheme instead of a FX-construction, and its middle permutation is non-involutory and keyed. We introduce and analyse a family of Almost MDS matrices defined over a ring with zero divisors that allows us to encode rotations in its operation while maintaining the minimal latency associated to {0, 1}-matrices. The purpose of all these design choices is to harden the cipher against various classes of attacks. We also describe new S-Box search heuristics aimed at minimising the critical path. QARMA exists in 64- and 128-bit block sizes, where block and tweak size are equal, and keys are twice as long as the blocks. We argue that QARMA provides sufficient security margins within the constraints de- termined by the mentioned applications, while still achieving best-in-class latency. Implementation results on a state-of-the art manufacturing process are reported.