Measuring the Security Harm of TLS Crypto Shortcuts
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Announcement
Announcement Total 100 articles, created at 2016-06-09 18:04 1 Best mobile games of 2016 (pictures) Looking for a new game to play on your mobile device? Here's our pick of the best released in 2016 (so far). 2016-06-09 12:53 677Bytes (1.08/2) www.cnet.com 2 Apple revamps App Store, may not win over developers Apple Inc. announced a series of long-awaited enhancements to (1.05/2) its App Store on Wednesday, but the new features may not ease concerns of developers and analysts who say that the App Store model - and the very idea of the single-purpose app - has... 2016-06-09 08:46 4KB pctechmag.com 3 HPE Unveils Converged Systems for IoT The Edgeline EL1000 and EL4000 systems are part of a larger series of announcements by HPE to address such IoT issues as (1.02/2) security and management. 2016-06-09 12:49 5KB www.eweek.com 4 What is AmazonFresh? Amazon launches new grocery service for the UK: Can I get (1.02/2) AmazonFresh in the UK? What is AmazonFresh, Amazon launches new grocery service for the UK, Can I get AmazonFresh in the UK, where does AmazonFresh deliver, what does AmazonFresh deliver 2016-06-09 12:42 3KB www.pcadvisor.co.uk 5 Borderlands 3 UK release date, price and gamelplay rumours: Gearbox has confirmed the (1.02/2) game is being developed Gearbox, the developers behind the Borderlands series are back it again with a new game on the horizon. 2016-06-09 11:00 3KB www.pcadvisor.co.uk 6 More Than 32 Million Twitter Passwords May Have Been Hacked And Leaked On The Dark (1.02/2) Web Last week Facebook’s CEO Mark Zuckerberg's social accounts; Pinterest and Twitter were briefly hacked, with the details coming from the LinkedIn breach that happened in 2012, with the founder of the world’s biggest social network reusing the password “dadada.” This time around Twitter users have become the.. -
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Fast Elliptic Curve Cryptography in Openssl
Fast Elliptic Curve Cryptography in OpenSSL Emilia K¨asper1;2 1 Google 2 Katholieke Universiteit Leuven, ESAT/COSIC [email protected] Abstract. We present a 64-bit optimized implementation of the NIST and SECG-standardized elliptic curve P-224. Our implementation is fully integrated into OpenSSL 1.0.1: full TLS handshakes using a 1024-bit RSA certificate and ephemeral Elliptic Curve Diffie-Hellman key ex- change over P-224 now run at twice the speed of standard OpenSSL, while atomic elliptic curve operations are up to 4 times faster. In ad- dition, our implementation is immune to timing attacks|most notably, we show how to do small table look-ups in a cache-timing resistant way, allowing us to use precomputation. To put our results in context, we also discuss the various security-performance trade-offs available to TLS applications. Keywords: elliptic curve cryptography, OpenSSL, side-channel attacks, fast implementations 1 Introduction 1.1 Introduction to TLS Transport Layer Security (TLS), the successor to Secure Socket Layer (SSL), is a protocol for securing network communications. In its most common use, it is the \S" (standing for \Secure") in HTTPS. Two of the most popular open- source cryptographic libraries implementing SSL and TLS are OpenSSL [19] and Mozilla Network Security Services (NSS) [17]: OpenSSL is found in, e.g., the Apache-SSL secure web server, while NSS is used by Mozilla Firefox and Chrome web browsers, amongst others. TLS provides authentication between connecting parties, as well as encryp- tion of all transmitted content. Thus, before any application data is transmit- ted, peers perform authentication and key exchange in a TLS handshake. -
General Terms of Service for Website
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Digital Security for Activists
Training the Motivated: Digital Security for Activists Glencora Borradaile Kelsy Kretschmer Abstract School of Electrical Engineering School of Public Policy The state of global surveillance and the political and Computer Science Sociology Program environment has many activists caring more about their Oregon State University Oregon State University online security culture. We report on the initiation of a Corvallis, OR 97331, USA Corvallis, OR 97331, USA Digital Security for Activists program and a pilot study of an [email protected] [email protected] introductory seminar. Pre- and post-surveys of the seminar will form an initial assessment of what kind of intervention might increase the security practices of activists and to inform the design of program offerings. We report on the pre-surveys from three offerings of the seminar. Introduction In collaboration with the Civil Liberties Defense Center (CLDC), the first author had been offering informal digital security trainings for activists and their lawyers. After the fall elections in the U.S., requests for these trainings increased dramatically and shortly thereafter we launched a Digital Security for Activists (DSA) program. The DSA program’s intent is to align with the CLDC mission (“to defend and uphold civil liberties through education, outreach, litigation, legal support, and assistance”) and enable citizen activists to assert their constitutional rights while organizing online. Copyright is held by the author/owner. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee. Poster In order to provide trainings that are useful and effective, we presented at the 13th Symposium on Usable Privacy and Security (SOUPS 2017). -
Dynamic Public Key Certificates with Forward Secrecy
electronics Article Dynamic Public Key Certificates with Forward Secrecy Hung-Yu Chien Department of Information Management, National Chi Nan University, Nantou 54561, Taiwan; [email protected] Abstract: Conventionally, public key certificates bind one subject with one static public key so that the subject can facilitate the services of the public key infrastructure (PKI). In PKI, certificates need to be renewed (or revoked) for several practical reasons, including certificate expiration, private key breaches, condition changes, and possible risk reduction. The certificate renewal process is very costly, especially for those environments where online authorities are not available or the connection is not reliable. A dynamic public key certificate (DPKC) facilitates the dynamic changeover of the current public–private key pairs without renewing the certificate authority (CA). This paper extends the previous study in several aspects: (1) we formally define the DPKC; (2) we formally define the security properties; (3) we propose another implementation of the Krawczyk–Rabin chameleon-hash- based DPKC; (4) we propose two variants of DPKC, using the Ateniese–Medeiros key-exposure-free chameleon hash; (5) we detail two application scenarios. Keywords: dynamic public key certificate; chameleon signature; certificate renewal; wireless sensor networks; perfect forward secrecy 1. Introduction Citation: Chien, H.-Y. Dynamic Certificates act as the critical tokens in conventional PKI systems. With the trust Public Key Certificates with Forward of the CA, a -
SSL Checklist for Pentesters
SSL Checklist for Pentesters Jerome Smith BSides MCR, 27th June 2014 # whoami whoami jerome • Pentester • Author/trainer – Hands-on technical – Web application, infrastructure, wireless security • Security projects – Log correlation – Dirty data – Incident response exercises • Sysadmin • MSc Computing Science (Dist) • www.exploresecurity.com | @exploresecurity Introduction • Broad review of SSL/TLS checks – Viewpoint of pentester – Pitfalls – Manually replicating what tools do (unless you told the client that SSL Labs would be testing them ) – Issues to consider reporting (but views are my own) • While SSL issues are generally low in priority, it’s nice to get them right! • I’m not a cryptographer: this is all best efforts SSLv2 • Flawed, e.g. no handshake protection → MITM downgrade • Modern browsers do not support SSLv2 anyway – Except for IE but it’s disabled by default from IE7 – That mitigates the risk these days – http://en.wikipedia.org/wiki/Transport_Layer_Security#W eb_browsers • OpenSSL 1.0.0+ doesn’t support it – Which means SSLscan won’t find it – General point: tools that dynamically link to an underlying SSL library in the OS can be limited by what that library supports SSLv2 • Same scan on different OpenSSL versions: SSLv2 • testssl.sh warns you – It can work with any installed OpenSSL version • OpenSSL <1.0.0 s_client -ssl2 switch – More on this later • Recompile OpenSSL – http://blog.opensecurityresearch.com/2013/05/fixing-sslv2-support- in-kali-linux.html • SSLyze 0.7+ is statically linked – Watch out for bug https://github.com/iSECPartners/sslyze/issues/73 -
Sicherheit in Kommunikationsnetzen (Network Security)
Sicherheit in Kommunikationsnetzen (Network Security) Transport Layer Security Dr.-Ing. Matthäus Wander Universität Duisburg-Essen Transport Layer Security (TLS) PrivateTLS data Web browser Web server ∙ Cryptographic protocol ∘ Provides security on top of reliable transport (TCP) ∘ Used to secure HTTP, SMTP, IMAP, XMPP and others ∙ Security goals ∘ Authentication of server and optionally client ∘ Data integrity (no manipulation of data) ∘ Confidentiality (encryption) Universität Duisburg-Essen Matthäus Wander 2 Verteilte Systeme History ∙ Predecessor: Secure Sockets Layer (SSL) ∘ Developed by Netscape for HTTPS (= HTTP + SSL) ∙ 1994: SSL 2.0 ∘ Insecure, major security weaknesses ∙ 1995: SSL 3.0 ∘ Insecure, deprecated since 2015 (RFC 7568) ∙ 1999: TLS 1.0, minor improvements to SSL 3.0 ∘ Standardization and further development by IETF Universität Duisburg-Essen Matthäus Wander 3 Verteilte Systeme History ∙ 2003: TLS Extensions ∘ New features or security mechanisms (e.g. Encrypt-then-MAC, RFC 7366) ∙ 2006: TLS 1.1 ∘ Security improvements ∙ 2008: TLS 1.2 Presented in this lecture ∘ Added new or replaced old cryptographic algorithms ∙ TLS 1.3 is work in progress as of 2017 ∘ Outlook: new handshake and other major changes Universität Duisburg-Essen Matthäus Wander 4 Verteilte Systeme Protocol Overview Application Layer (e.g. HTTP) Handshake Change Cipher Application Alert Protocol Protocol Spec Protocol Data Protocol Record Protocol Transport Layer (e.g. TCP) ∙ TLS consists of two layers: ∘ Handshake Protocol and other protocols ∘ Record Protocol -
Legal Responses and Countermeasures to National Security Letters
Washington University Journal of Law & Policy Volume 47 Intellectual Property: From Biodiversity to Technical Standards 2015 Legal Responses and Countermeasures to National Security Letters Brett Weinstein Washington University School of Law Follow this and additional works at: https://openscholarship.wustl.edu/law_journal_law_policy Part of the National Security Law Commons Recommended Citation Brett Weinstein, Legal Responses and Countermeasures to National Security Letters, 47 WASH. U. J. L. & POL’Y 217 (2015), https://openscholarship.wustl.edu/law_journal_law_policy/vol47/iss1/15 This Note is brought to you for free and open access by the Law School at Washington University Open Scholarship. It has been accepted for inclusion in Washington University Journal of Law & Policy by an authorized administrator of Washington University Open Scholarship. For more information, please contact [email protected]. Legal Responses and Countermeasures to National Security Letters Brett Weinstein INTRODUCTION In early June of 2013, governmental surveillance suddenly and dramatically entered the public consciousness, prompting a torrent of debate and backlash. The Guardian published a top secret court order requiring Verizon to hand over all telephone call records to the National Security Agency (NSA); the Washington Post disclosed a secret but widespread Internet surveillance program, and months of similar revelations followed, all stemming from leaks by former NSA contractor, Edward Snowden.1 As a result, the public and the press began to question the tools that the government uses for surveillance, including National Security Letters (NSLs), and the relationship between the government and the technology and telecommunications companies that seemingly possess all personal and private information generated in the modern, digital world.2 J.D. -
Prying Open Pandora's Box: KCI Attacks Against
Prying open Pandora’s box: KCI attacks against TLS Clemens Hlauschek, Markus Gruber, Florian Fankhauser, Christian Schanes RISE – Research Industrial Systems Engineering GmbH {clemens.hlauschek, markus.gruber, florian.fankhauser, christian.schanes}@rise-world.com Abstract and implementations of the protocol: their utility is ex- tremely limited, their raison d’ˆetre is practically nil, and Protection of Internet communication is becoming more the existence of these insecure key agreement options common in many products, as the demand for privacy only adds to the arsenal of attack vectors against cryp- in an age of state-level adversaries and crime syndi- tographically secured communication on the Internet. cates is steadily increasing. The industry standard for doing this is TLS. The TLS protocol supports a multi- 1 Introduction tude of key agreement and authentication options which provide various different security guarantees. Recent at- The TLS protocol [1, 2, 3] is probably the most tacks showed that this plethora of cryptographic options widely used cryptographic protocol on the Internet. in TLS (including long forgotten government backdoors, It is designed to secure the communication between which have been cunningly inserted via export restric- client/server applications against eavesdropping, tamper- tion laws) is a Pandora’s box, waiting to be pried open by ing, and message forgery, and it also provides additional, heinous computer whizzes. Novel attacks lay hidden in optional security properties such as client authentica- plainsight. Parts of TLS areso oldthat theirfoul smell of tion. TLS is an historically grown giant: its predecessor, rot cannot be easily distinguished from the flowery smell SSL [4,5], was developed more than 20 years ago. -
FBI–Apple Encryption Dispute - Wikipedia, the Free Encyclopedia 6/2/16, 6:59 AM
FBI–Apple encryption dispute - Wikipedia, the free encyclopedia 6/2/16, 6:59 AM FBI–Apple encryption dispute From Wikipedia, the free encyclopedia The FBI–Apple encryption dispute concerns whether and to what extent courts in the United States can compel manufacturers to assist in unlocking cell phones whose contents are cryptographically protected.[1] There is much debate over public access to strong encryption.[2] In 2015 and 2016, Apple Inc. has received and objected to or challenged at least 11 orders issued by United States district courts under the All Writs Act of 1789. Most of these seek to compel Apple "to use its existing capabilities to extract data like contacts, photos and calls from locked iPhones running on operating systems iOS 7 and older" in order to assist in criminal investigations and prosecutions. A few requests, however, involve phones with more extensive security protections, which Apple has no current ability to break. These orders would compel Apple to write new software that would let the government bypass these device's security and unlock the phones.[3] The most well-known instance of the latter category was a February 2016 court case in the United States District Court for the Central District of California. The FBI wanted Apple to create and electronically An iPhone 5C, the model used by one sign new software that would enable the FBI to unlock a work-issued of the perpetrators of the 2015 San iPhone 5C it recovered from one of the shooters in a December 2015 Bernardino attack terrorist attack in San Bernardino, California, that killed 14 people and injured 22. -
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