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Course 5 Lesson 2
This material is based on work supported by the National Science Foundation under Grant No. 0802551 Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author (s) and do not necessarily reflect the views of the National Science Foundation C5L3S1 With the advent of the Internet, social networking, and open communication, a vast amount of information is readily available on the Internet for anyone to access. Despite this trend, computer users need to ensure private or personal communications remain confidential and are viewed only by the intended party. Private information such as a social security numbers, school transcripts, medical histories, tax records, banking, and legal documents should be secure when transmitted online or stored locally. One way to keep data confidential is to encrypt it. Militaries,U the governments, industries, and any organization having a desire to maintain privacy have used encryption techniques to secure information. Encryption helps to boost confidence in the security of online commerce and is necessary for secure transactions. In this lesson, you will review encryption and examine several tools used to encrypt data. You will also learn to encrypt and decrypt data. Anyone who desires to administer computer networks and work with private data must have some familiarity with basic encryption protocols and techniques. C5L3S2 You should know what will be expected of you when you complete this lesson. These expectations are presented as objectives. Objectives are short statements of expectations that tell you what you must be able to do, perform, learn, or adjust after reviewing the lesson. -
Chapter 12 Pretty Good Privacy (PGP)
Chapter 12 Pretty Good Privacy (PGP) With the explosively growing reliance on electronic mail for every conceivable pur- pose, there grows a demand for authentication and confidentiality services. Two schemes stand out as approaches that enjoy widespread use: Pretty Good Privacy (PGP) and Secure/Multipurpose Internet Mail Extension (S/MIME). The latter is a security en- hancement to the MIME Internet e-mail format standard, based on technology from RSA Data Security. Although both PGP and S/MIME are on an IETF standards track, it appears likely that S/MIME will emerge as the industry standard for commercial and organisational use, while PGP will remain the choice for personal e-mail security for many users. In this course we will only be looking at PGP. S/MIME is discussed in detail in the recommended text. 12.1 Background PGP is a remarkable phenomenon. Largely the effort of a single person, Phil Zimmer- mann, PGP provides a confidentiality and authentication service that can be used for electronic mail and file storage applications. In essence what Zimmermann has done is the following: 1. Selected the best cryptographic mechanisms (algorithms) as building blocks. 2. Integrated these algorithms into a general purpose application that is independent of operating system and processor and that is based on a small set of easy to use commands. 3. Made the package and its source code freely available via the Internet, bulletin boards, and commercial networks such as America On Line (AOL). 4. Entered into an agreement with a company (Viacrypt, now Network Associates) to provide a fully compatible low cost commercial version of PGP. -
Can We Trust Cryptographic Software? Cryptographic Flaws in GNU Privacy Guard V1.2.3
Can We Trust Cryptographic Software? Cryptographic Flaws in GNU Privacy Guard v1.2.3 Phong Q. Nguyen CNRS/Ecole´ normale sup´erieure D´epartement d’informatique 45 rue d’Ulm, 75230 Paris Cedex 05, France. [email protected] http://www.di.ens.fr/˜pnguyen Abstract. More and more software use cryptography. But how can one know if what is implemented is good cryptography? For proprietary soft- ware, one cannot say much unless one proceeds to reverse-engineering, and history tends to show that bad cryptography is much more frequent than good cryptography there. Open source software thus sounds like a good solution, but the fact that a source code can be read does not imply that it is actually read, especially by cryptography experts. In this paper, we illustrate this point by examining the case of a basic In- ternet application of cryptography: secure email. We analyze parts of thesourcecodeofthelatestversionofGNUPrivacyGuard(GnuPGor GPG), a free open source alternative to the famous PGP software, com- pliant with the OpenPGP standard, and included in most GNU/Linux distributions such as Debian, MandrakeSoft, Red Hat and SuSE. We ob- serve several cryptographic flaws in GPG v1.2.3. The most serious flaw has been present in GPG for almost four years: we show that as soon as one (GPG-generated) ElGamal signature of an arbitrary message is released, one can recover the signer’s private key in less than a second on a PC. As a consequence, ElGamal signatures and the so-called ElGamal sign+encrypt keys have recently been removed from GPG. -
Crypto Wars of the 1990S
Danielle Kehl, Andi Wilson, and Kevin Bankston DOOMED TO REPEAT HISTORY? LESSONS FROM THE CRYPTO WARS OF THE 1990S CYBERSECURITY June 2015 | INITIATIVE © 2015 NEW AMERICA This report carries a Creative Commons license, which permits non-commercial re-use of New America content when proper attribution is provided. This means you are free to copy, display and distribute New America’s work, or in- clude our content in derivative works, under the following conditions: ATTRIBUTION. NONCOMMERCIAL. SHARE ALIKE. You must clearly attribute the work You may not use this work for If you alter, transform, or build to New America, and provide a link commercial purposes without upon this work, you may distribute back to www.newamerica.org. explicit prior permission from the resulting work only under a New America. license identical to this one. For the full legal code of this Creative Commons license, please visit creativecommons.org. If you have any questions about citing or reusing New America content, please contact us. AUTHORS Danielle Kehl, Senior Policy Analyst, Open Technology Institute Andi Wilson, Program Associate, Open Technology Institute Kevin Bankston, Director, Open Technology Institute ABOUT THE OPEN TECHNOLOGY INSTITUTE ACKNOWLEDGEMENTS The Open Technology Institute at New America is committed to freedom The authors would like to thank and social justice in the digital age. To achieve these goals, it intervenes Hal Abelson, Steven Bellovin, Jerry in traditional policy debates, builds technology, and deploys tools with Berman, Matt Blaze, Alan David- communities. OTI brings together a unique mix of technologists, policy son, Joseph Hall, Lance Hoffman, experts, lawyers, community organizers, and urban planners to examine the Seth Schoen, and Danny Weitzner impacts of technology and policy on people, commerce, and communities. -
A History of End-To-End Encryption and the Death of PGP
25/05/2020 A history of end-to-end encryption and the death of PGP Hey! I'm David, a security engineer at the Blockchain team of Facebook (https://facebook.com/), previously a security consultant for the Cryptography Services of NCC Group (https://www.nccgroup.com). I'm also the author of the Real World Cryptography book (https://www.manning.com/books/real-world- cryptography?a_aid=Realworldcrypto&a_bid=ad500e09). This is my blog about cryptography and security and other related topics that I Ûnd interesting. A history of end-to-end encryption and If you don't know where to start, you might want to check these popular the death of PGP articles: posted January 2020 - How did length extension attacks made it 1981 - RFC 788 - Simple Mail Transfer Protocol into SHA-2? (/article/417/how-did-length- extension-attacks-made-it-into-sha-2/) (https://tools.ietf.org/html/rfc788) (SMTP) is published, - Speed and Cryptography the standard for email is born. (/article/468/speed-and-cryptography/) - What is the BLS signature scheme? (/article/472/what-is-the-bls-signature- This is were everything starts, we now have an open peer-to-peer scheme/) protocol that everyone on the internet can use to communicate. - Zero'ing memory, compiler optimizations and memset_s (/article/419/zeroing-memory- compiler-optimizations-and-memset_s/) 1991 - The 9 Lives of Bleichenbacher's CAT: New Cache ATtacks on TLS Implementations The US government introduces the 1991 Senate Bill 266, (/article/461/the-9-lives-of-bleichenbachers- which attempts to allow "the Government to obtain the cat-new-cache-attacks-on-tls- plain text contents of voice, data, and other implementations/) - How to Backdoor Di¸e-Hellman: quick communications when appropriately authorized by law" explanation (/article/360/how-to-backdoor- from "providers of electronic communications services di¸e-hellman-quick-explanation/) and manufacturers of electronic communications - Tamarin Prover Introduction (/article/404/tamarin-prover-introduction/) service equipment". -
Self-Encrypting Deception: Weaknesses in the Encryption of Solid State Drives
Self-encrypting deception: weaknesses in the encryption of solid state drives Carlo Meijer Bernard van Gastel Institute for Computing and Information Sciences School of Computer Science Radboud University Nijmegen Open University of the Netherlands [email protected] and Institute for Computing and Information Sciences Radboud University Nijmegen Bernard.vanGastel@{ou.nl,ru.nl} Abstract—We have analyzed the hardware full-disk encryption full-disk encryption. Full-disk encryption software, especially of several solid state drives (SSDs) by reverse engineering their those integrated in modern operating systems, may decide to firmware. These drives were produced by three manufacturers rely solely on hardware encryption in case it detects support between 2014 and 2018, and are both internal models using the SATA and NVMe interfaces (in a M.2 or 2.5" traditional form by the storage device. In case the decision is made to rely on factor) and external models using the USB interface. hardware encryption, typically software encryption is disabled. In theory, the security guarantees offered by hardware encryp- As a primary example, BitLocker, the full-disk encryption tion are similar to or better than software implementations. In software built into Microsoft Windows, switches off software reality, we found that many models using hardware encryption encryption and completely relies on hardware encryption by have critical security weaknesses due to specification, design, and implementation issues. For many models, these security default if the drive advertises support. weaknesses allow for complete recovery of the data without Contribution. This paper evaluates both internal and external knowledge of any secret (such as the password). -
A Tool for Protecting Children's Privacy Online☆
Decision Support Systems 54 (2013) 1161–1173 Contents lists available at SciVerse ScienceDirect Decision Support Systems journal homepage: www.elsevier.com/locate/dss POCKET: A tool for protecting children's privacy online☆ France Bélanger a, Robert E. Crossler b,⁎, Janine S. Hiller c, Jung-Min Park d, Michael S. Hsiao d a 850 Drillfield Drive, Suite 3007, Blacksburg, VA 24061–0101, USA b PO Box 9581, Mississippi State University, Mississippi State, MS 39762, USA c 850 Drillfield Drive, Suite 2120, Blacksburg, VA 24061–0221, USA d 1185 Perry St. Room 302, Blacksburg, VA 24061–0111, USA article info abstract Article history: Children's privacy in the online environment has become critical. Use of the Internet is increasing for com- Received 3 August 2011 mercial purposes, in requests for information, and in the number of children who use the Internet for casual Received in revised form 12 September 2012 web surfing, chatting, games, schoolwork, e-mail, interactive learning, and other applications. Often, websites Accepted 11 November 2012 hosting these activities ask for personal information such as name, e-mail, street address, and phone number. Available online 19 November 2012 In the United States, the children's online privacy protection act (COPPA) of 1998 was enacted in reaction to widespread collection of information from children and subsequent abuses identified by the Federal Trade Keywords: Information privacy Commission (FTC). COPPA is aimed at protecting a child's privacy by requiring parental consent before Privacy collecting information from children under the age of 13. To date, however, the business practices used COPPA and the technical approaches employed to comply with COPPA fail to protect children's online privacy effec- Children tively. -
Pgpfone Pretty Good Privacy Phone Owner’S Manual Version 1.0 Beta 7 -- 8 July 1996
Phil’s Pretty Good Software Presents... PGPfone Pretty Good Privacy Phone Owner’s Manual Version 1.0 beta 7 -- 8 July 1996 Philip R. Zimmermann PGPfone Owner’s Manual PGPfone Owner’s Manual is written by Philip R. Zimmermann, and is (c) Copyright 1995-1996 Pretty Good Privacy Inc. All rights reserved. Pretty Good Privacy™, PGP®, Pretty Good Privacy Phone™, and PGPfone™ are all trademarks of Pretty Good Privacy Inc. Export of this software may be restricted by the U.S. government. PGPfone software is (c) Copyright 1995-1996 Pretty Good Privacy Inc. All rights reserved. Phil’s Pretty Good engineering team: PGPfone for the Apple Macintosh and Windows written mainly by Will Price. Phil Zimmermann: Overall application design, cryptographic and key management protocols, call setup negotiation, and, of course, the manual. Will Price: Overall application design. He persuaded the rest of the team to abandon the original DOS command-line approach and designed a multithreaded event-driven GUI architecture. Also greatly improved call setup protocols. Chris Hall: Did early work on call setup protocols and cryptographic and key management protocols, and did the first port to Windows. Colin Plumb: Cryptographic and key management protocols, call setup negotiation, and the fast multiprecision integer math package. Jeff Sorensen: Speech compression. Will Kinney: Optimization of GSM speech compression code. Kelly MacInnis: Early debugging of the Win95 version. Patrick Juola: Computational linguistic research for biometric word list. -2- PGPfone Owner’s -
Dell EMC Unity: Data at Rest Encryption a Detailed Review
Technical White Paper Dell EMC Unity: Data at Rest Encryption A Detailed Review Abstract This white paper explains the Data at Rest Encryption feature, which provides controller-based encryption of data stored on Dell EMC™ Unity storage systems to protect against unauthorized access to lost or stolen drives or system. The encryption technology as well as its implementation on Dell EMC Unity storage systems are discussed. June 2021 H15090.6 Revisions Revisions Date Description May 2016 Initial release – Unity OE 4.0 July 2017 Updated for Unity OE 4.2 June 2021 Template and format updates. Updated for Unity OE 5.1 Acknowledgments Author: Ryan Poulin The information in this publication is provided “as is.” Dell Inc. makes no representations or warranties of any kind with respect to the information in this publication, and specifically disclaims implied warranties of merchantability or fitness for a particular purpose. Use, copying, and distribution of any software described in this publication requires an applicable software license. This document may contain certain words that are not consistent with Dell's current language guidelines. Dell plans to update the document over subsequent future releases to revise these words accordingly. This document may contain language from third party content that is not under Dell's control and is not consistent with Dell's current guidelines for Dell's own content. When such third party content is updated by the relevant third parties, this document will be revised accordingly. Copyright © 2016-2021 Dell Inc. or its subsidiaries. All Rights Reserved. Dell Technologies, Dell, EMC, Dell EMC and other trademarks are trademarks of Dell Inc. -
Encryption in SAS 9.4, Sixth Edition
Encryption in SAS® 9.4, Sixth Edition SAS® Documentation July 31, 2020 The correct bibliographic citation for this manual is as follows: SAS Institute Inc. 2016. Encryption in SAS® 9.4, Sixth Edition. Cary, NC: SAS Institute Inc. Encryption in SAS® 9.4, Sixth Edition Copyright © 2016, SAS Institute Inc., Cary, NC, USA All Rights Reserved. Produced in the United States of America. For a hard copy book: No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without the prior written permission of the publisher, SAS Institute Inc. For a web download or e-book: Your use of this publication shall be governed by the terms established by the vendor at the time you acquire this publication. The scanning, uploading, and distribution of this book via the Internet or any other means without the permission of the publisher is illegal and punishable by law. Please purchase only authorized electronic editions and do not participate in or encourage electronic piracy of copyrighted materials. Your support of others' rights is appreciated. U.S. Government License Rights; Restricted Rights: The Software and its documentation is commercial computer software developed at private expense and is provided with RESTRICTED RIGHTS to the United States Government. Use, duplication, or disclosure of the Software by the United States Government is subject to the license terms of this Agreement pursuant to, as applicable, FAR 12.212, DFAR 227.7202-1(a), DFAR 227.7202-3(a), and DFAR 227.7202-4, and, to the extent required under U.S. -
Security Analysis of the Signal Protocol Student: Bc
ASSIGNMENT OF MASTER’S THESIS Title: Security Analysis of the Signal Protocol Student: Bc. Jan Rubín Supervisor: Ing. Josef Kokeš Study Programme: Informatics Study Branch: Computer Security Department: Department of Computer Systems Validity: Until the end of summer semester 2018/19 Instructions 1) Research the current instant messaging protocols, describe their properties, with a particular focus on security. 2) Describe the Signal protocol in detail, its usage, structure, and functionality. 3) Select parts of the protocol with a potential for security vulnerabilities. 4) Analyze these parts, particularly the adherence of their code to their documentation. 5) Discuss your findings. Formulate recommendations for the users. References Will be provided by the supervisor. prof. Ing. Róbert Lórencz, CSc. doc. RNDr. Ing. Marcel Jiřina, Ph.D. Head of Department Dean Prague January 27, 2018 Czech Technical University in Prague Faculty of Information Technology Department of Computer Systems Master’s thesis Security Analysis of the Signal Protocol Bc. Jan Rub´ın Supervisor: Ing. Josef Kokeˇs 1st May 2018 Acknowledgements First and foremost, I would like to express my sincere gratitude to my thesis supervisor, Ing. Josef Kokeˇs,for his guidance, engagement, extensive know- ledge, and willingness to meet at our countless consultations. I would also like to thank my brother, Tom´aˇsRub´ın,for proofreading my thesis. I cannot express enough gratitude towards my parents, Lenka and Jaroslav Rub´ınovi, who supported me both morally and financially through my whole studies. Last but not least, this thesis would not be possible without Anna who re- lentlessly supported me when I needed it most. Declaration I hereby declare that the presented thesis is my own work and that I have cited all sources of information in accordance with the Guideline for adhering to ethical principles when elaborating an academic final thesis. -
Dynamic Cryptographic Hash Functions
Dynamic Cryptographic Hash Functions William R. Speirs II and Samuel S. Wagstaff, Jr. Center for Education and Research in Information Assurance and Security (CERIAS) Department of Computer Sciences, Purdue University Abstract. We present the dynamic cryptographic hash function, a new type of hash function which takes two parameters instead of one. The additional parameter, the security parameter, specifies the internal work- ings and size of the digest produced. We provide a formal definitions for a dynamic cryptographic hash function and for the traditional security properties, modified for dynamic hash functions. Two additional prop- erties, security parameter collision resistance and digest resistance, are also defined. The additional properties are motivated by scenarios where a dynamic hash functions more cleanly provides a solution to a typical cryptographic problem. Keywords: Hash function, dynamic hash function, security parameter. 1 Introduction In this paper we introduce a new type of cryptographic hash function that is a natural extension of traditional hash functions. We call this new type of hash function a dynamic hash function. Dynamic hash functions take a second input, besides the message, that specifies the level of security required from the func- tion. By changing the security parameter the function dynamically changes the way a digest is computed, hence the reason for the name. The change might be as simple as changing the number of rounds used for processing a message block or the size of the output of the function. Requiring a hash function to have a security parameter is advantageous for a number of reasons. First, it allows designers to more easily test functions by scaling down the number of rounds to a manageable number and then launching attacks against this reduced version.