The Case for Ubiquitous Transport-Level Encryption
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Microsoft DNS
1 a. Domain Name Service (DNS) encompassing Microsoft DNS From Wikipedia, the free encyclopedia Jump to: navigation, search Microsoft DNS is the name given to the implementation of domain name system services provided in Microsoft Windows operating systems. Contents [hide] 1 Overview 2 DNS lookup client o 2.1 The effects of running the DNS Client service o 2.2 Differences from other systems 3 Dynamic DNS Update client 4 DNS server o 4.1 Common issues 5 See also 6 References 7 External links [edit] Overview The Domain Name System support in Microsoft Windows NT, and thus its derivatives Windows 2000, Windows XP, and Windows Server 2003, comprises two clients and a server. Every Microsoft Windows machine has a DNS lookup client, to perform ordinary DNS lookups. Some machines have a Dynamic DNS client, to perform Dynamic DNS Update transactions, registering the machines' names and IP addresses. Some machines run a DNS server, to publish DNS data, to service DNS lookup requests from DNS lookup clients, and to service DNS update requests from DNS update clients. The server software is only supplied with the server versions of Windows. [edit] DNS lookup client Applications perform DNS lookups with the aid of a DLL. They call library functions in the DLL, which in turn handle all communications with DNS servers (over UDP or TCP) and return the final results of the lookup back to the applications. 2 Microsoft's DNS client also has optional support for local caching, in the form of a DNS Client service (also known as DNSCACHE). Before they attempt to directly communicate with DNS servers, the library routines first attempt to make a local IPC connection to the DNS Client service on the machine. -
Opportunistic Keying As a Countermeasure to Pervasive Monitoring
Opportunistic Keying as a Countermeasure to Pervasive Monitoring Stephen Kent BBN Technologies Abstract This document was prepared as part of the IETF response to concerns about “pervasive monitoring” (PM) [Farrell-pm]. It begins by exploring terminology that has been used in IETF standards (and in academic publications) to describe encryption and key management techniques, with a focus on authentication and anonymity. Based on this analysis, it propose a new term, “opportunistic keying” to describe a goal for IETF security protocols, in response to PM. It reviews key management mechanisms used in IETF security protocol standards, also with respect to these properties. The document explores possible impediments to and potential adverse effects associated with deployment and use of techniques that would increase the use of encryption, even when keys are distributed in an unauthenticated manner. 1. What’s in a Name (for Encryption)? Recent discussions in the IETF about pervasive monitoring (PM) have suggested a desire to increase use of encryption, even when the encrypted communication is unauthenticated. The term “opportunistic encryption” has been suggested as a term to describe key management techniques in which authenticated encryption is the preferred outcome, unauthenticated encryption is an acceptable fallback, and plaintext (unencrypted) communication is an undesirable (but perhaps necessary) result. This mode of operation differs from the options commonly offered by many IETF security protocols, in which authenticated, encrypted communication is the desired outcome, but plaintext communication is the fallback. The term opportunistic encryption (OE) was coined by Michael Richardson in “Opportunistic Encryption using the Internet Key Exchange (IKE)” an Informational RFC [RFC4322]. -
Software-Defined Networking: Improving Security for Enterprise and Home Networks
Worcester Polytechnic Institute Digital WPI Doctoral Dissertations (All Dissertations, All Years) Electronic Theses and Dissertations 2017-04-24 Software-defined etN working: Improving Security for Enterprise and Home Networks Curtis Robin Taylor Worcester Polytechnic Institute Follow this and additional works at: https://digitalcommons.wpi.edu/etd-dissertations Repository Citation Taylor, C. R. (2017). Software-defined Networking: Improving Security for Enterprise and Home Networks. Retrieved from https://digitalcommons.wpi.edu/etd-dissertations/161 This dissertation is brought to you for free and open access by Digital WPI. It has been accepted for inclusion in Doctoral Dissertations (All Dissertations, All Years) by an authorized administrator of Digital WPI. For more information, please contact [email protected]. Software-defined Networking: Improving Security for Enterprise and Home Networks by Curtis R. Taylor A Dissertation Submitted to the Faculty of the WORCESTER POLYTECHNIC INSTITUTE In partial fulfillment of the requirements for the Degree of Doctor of Philosophy in Computer Science by May 2017 APPROVED: Professor Craig A. Shue, Dissertation Advisor Professor Craig E. Wills, Head of Department Professor Mark Claypool, Committee Member Professor Thomas Eisenbarth, Committee Member Doctor Nathanael Paul, External Committee Member Abstract In enterprise networks, all aspects of the network, such as placement of security devices and performance, must be carefully considered. Even with forethought, networks operators are ulti- mately unaware of intra-subnet traffic. The inability to monitor intra-subnet traffic leads to blind spots in the network where compromised hosts have unfettered access to the network for spreading and reconnaissance. While network security middleboxes help to address compromises, they are limited in only seeing a subset of all network traffic that traverses routed infrastructure, which is where middleboxes are frequently deployed. -
How Can We Protect the Internet Against Surveillance?
How can we protect the Internet against surveillance? Seven TODO items for users, web developers and protocol engineers Peter Eckersley [email protected] Okay, so everyone is spying on the Internet It's not just the NSA... Lots of governments are in this game! Not to mention the commerical malware industry These guys are fearsome, octopus-like adversaries Does this mean we should just give up? No. Reason 1: some people can't afford to give up Reason 2: there is a line we can hold vs. So, how do we get there? TODO #1 Users should maximise their own security Make sure your OS and browser are patched! Use encryption where you can! In your browser, install HTTPS Everywhere https://eff.org/https-everywhere For instant messaging, use OTR (easiest with Pidgin or Adium, but be aware of the exploit risk tradeoff) For confidential browsing, use the Tor Browser Bundle Other tools to consider: TextSecure for SMS PGP for email (UX is terrible!) SpiderOak etc for cloud storage Lots of new things in the pipeline TODO #2 Run an open wireless network! openwireless.org How to do this securely right now? Chain your WPA2 network on a router below your open one. TODO #3 Site operators... Deploy SSL/TLS/HTTPS DEPLOY IT CORRECTLY! This, miserably, is a lot harder than it should be TLS/SSL Authentication Apparently, ~52 countries These are usually specialist, narrowly targetted attacks (but that's several entire other talks... we're working on making HTTPS more secure, easier and saner!) In the mean time, here's what you need A valid certificate HTTPS by default Secure cookies No “mixed content” Perfect Forward Secrecy A well-tuned configuration How do I make HTTPS the default? Firefox and Chrome: redirect, set the HSTS header Safari and IE: sorry, you can't (!!!) What's a secure cookie? Go and check your site right now.. -
The Danger of the New Internet Choke Points
The Danger of the New Internet Choke Points Authored by: Andrei Robachevsky, Christine Runnegar, Karen O’Donoghue and Mat Ford FEBRUARY 2014 Introduction The ongoing disclosures of pervasive surveillance of Internet users’ communications and data by national security agencies have prompted protocol designers, software and hardware vendors, as well as Internet service and content providers, to re-evaluate prevailing security and privacy threat models and to refocus on providing more effective security and confidentiality. At IETF88, there was consensus to address pervasive monitoring as an attack and to consider the pervasive attack threat model when designing a protocol. One area of work currently being pursued by the IETF is the viability of more widespread encryption. While there are some who believe that widely deployed encryption with strong authentication should be used extensively, many others believe that there are practical obstacles to this approach including a general lack of reasonable tools and user understanding as to how to use the technology, plus significant obstacles to scaling infrastructure and services using existing technologies. As a result, the discussion within the IETF has principally focused on opportunistic encryption and weak authentication. “Weak authentication” means cryptographically strong authentication between previously unknown parties without relying on trusted third parties. In certain contexts, and by using certain techniques, one can achieve the desired level of security (see, for instance, Arkko, Nikander. Weak Authentication: How to Authenticate Unknown Principals without Trusted Parties, Security Protocols Workshop, volume 2845 of Lecture Notes in Computer Science, page 5-19. Springer, (2002)). “Opportunistic encryption” refers to encryption without authentication. It is a mode of protocol operation where the content of the communication is secure against passive surveillance, but there is no guarantee that the endpoints are reliably identified. -
Network Working Group T. Pauly Internet-Draft Apple Inc
Network Working Group T. Pauly Internet-Draft Apple Inc. Intended status: Informational C. Perkins Expires: September 6, 2018 University of Glasgow K. Rose Akamai Technologies, Inc. C. Wood Apple Inc. March 05, 2018 A Survey of Transport Security Protocols draft-pauly-taps-transport-security-02 Abstract This document provides a survey of commonly used or notable network security protocols, with a focus on how they interact and integrate with applications and transport protocols. Its goal is to supplement efforts to define and catalog transport services [RFC8095] by describing the interfaces required to add security protocols. It examines Transport Layer Security (TLS), Datagram Transport Layer Security (DTLS), Quick UDP Internet Connections with TLS (QUIC + TLS), MinimalT, CurveCP, tcpcrypt, Internet Key Exchange with Encapsulating Security Protocol (IKEv2 + ESP), SRTP (with DTLS), and WireGuard. This survey is not limited to protocols developed within the scope or context of the IETF. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on September 6, 2018. -
Automatic Local Area Network Encryption
Vula: automatic local area network encryption Abstract—This paper introduces Vula, a protocol and suite of will benefit from the use of Vula 2. With Vula’s ability to be Free Software tools for automatically protecting network traffic gradually deployed, every host has a notion of cryptographic between hosts in the same Local Area Network (LAN). Without identity, and we think that with this improvement it will be any configuration, or any user awareness, Vula automatically clearer how to solve the problem of Internet-wide end-to-end blinds passive adversaries. With user awareness and a small encryption without resorting to sending unecrypted IP packets, amount of interaction, it also protects connections using .local encrypted but unauthenticated IP packets, or any of the various hostnames, or any other user supplied domain, against active adversaries. The protocol additionally provides protection against Single Points of Failure (SPOFs) as described in SectionII. a passive adversary who is recording traffic today and who may have a quantum computer tomorrow. Vula’s protections A. Motivation persist with network topology changes which occur naturally over time, allowing users to maintain cryptographic assurances Public and private personal networks are commonly de- while roaming between different LANs. The software operates ployed using wired Ethernet (802.3) or wireless LAN (802.11) without requiring centralized administration, specialized network standards without comprehensive protection against surveil- equipment, or significant performance penalties. lance adversaries. Ethernet networks are commonly deployed in consumer and commercial contexts without encryption of any kind. Authentication [2] of end-user’s computers may be combined with a protocol such as MACsec [48] or WPA for I. -
Applied Crypto Hardening
Applied Crypto Hardening Wolfgang Breyha, David Durvaux, Tobias Dussa, L. Aaron Kaplan, Florian Mendel, Christian Mock, Manuel Koschuch, Adi Kriegisch, Ulrich Pöschl, Ramin Sabet, Berg San, Ralf Schlatterbeck, Thomas Schreck, Alexander Würstlein, Aaron Zauner, Pepi Zawodsky (University of Vienna, CERT.be, KIT-CERT, CERT.at, A-SIT/IAIK, coretec.at,FH Campus Wien, VRVis, MilCERT Austria, A-Trust, Runtux.com,Friedrich-Alexander University Erlangen-Nuremberg, azet.org, maclemon.at) April 25, 2017 Contents 1. Abstract 5 1.1. Acknowledgements ........................................ 6 2. Introduction 8 2.1. Audience .............................................. 8 2.2. Related publications ........................................ 8 2.3. How to read this guide ....................................... 8 2.4. Disclaimer and scope ........................................ 9 2.4.1. Scope ............................................ 10 2.5. Methods ............................................... 11 3. Practical recommendations 12 3.1. Webservers ............................................. 12 3.1.1. Apache ........................................... 12 3.1.2. lighttpd ........................................... 13 3.1.3. nginx ............................................ 14 3.1.4. Cherokee .......................................... 15 3.1.5. MS IIS ............................................ 17 3.2. SSH ................................................. 20 3.2.1. OpenSSH .......................................... 20 3.2.2. Cisco ASA ......................................... -
Building Secure Channels
Building Secure Channels Kenny Paterson Information Security Group Overview • Why do we need secure channels? • What properties should they have? • Literature on secure channels • Extended Example: TLS 2 Why do we need secure channels? • Secure communications is the most common real- world application of cryptography today. • No, it’s not MPC for sugar beet auctions! • Secure channels are extremely widely-deployed in practice: • SSL/TLS, DTLS, IPsec, SSH, OpenVPN,… • WEP/WPA/WPA2 • GSM/UMTS/LTE • Cryptocat, OTR, SilentCircle,… • (QUIC, MinimalT, TCPcrypt) • Mostly, but not exclusively in the 2-party case. 3 What security properties should they have? • Confidentiality – privacy for data • Integrity – detection of data modification • Authenticity – assurance concerning the source of data • All in the face of active attackers who can modify, delete, inject, re-order network messages. • These three properties are relatively easy to achieve using Authenticated Encryption (AE) or AEAD. • Recall AE notion from Monday. • AEAD: some data encrypted and integrity protected, other data (the header) only integrity protected. • But AE/AEAD were not available at the time many of today’s systems were designed. • Note that authenticated key establishment (AKE) is out-of-scope for this talk. • We assume the keys are already in place. • A major assumption, but a different summer school! 4 What security properties should they have? Less obvious security properties: • Anti-replay – detection that messages have been repeated. • Drop-detection – detection that messages have been deleted by the adversary or dropped by the network. • Particularly acute for the last message on a channel. • Cookie cutter attack. • Prevention of re-0rdering attacks. • Preserving the relative order of messages in each direction. -
M 3 AAWG Describes Costs Associated with Using Crypto
Messaging, Malware and Mobile Anti-Abuse Working Group M3AAWG Describes Costs Associated with Using Crypto March 2017 The reference URL for this document: www.m3aawg.org/Crypto-Costs I. Introduction Deploying opportunistic encryption as described in TLS for Mail: M3AAWG Initial Recommendations is an excellent way to start protecting email traffic between providers. Using Forward Secrecy to Secure Data is a further step providers can take. Forward secrecy ensures that encrypted traffic can never be decrypted, even if the relevant private keys are somehow eventually obtained. However, most everything, including cryptographic secrecy and privacy, comes at a cost. This document describes the budget and other costs associated with using cryptography to help the reader make an informed decision about what to do, or not do, when faced with the need to deploy encryption. II. When Needed, Content based Spam and Malware Filtering Should Be Done On-System, Not Passively On-Network Links While encryption protects against unwanted eavesdropping or tampering, it also precludes passive network monitoring1 for beneficial purposes, such as blocking spam or filtering malware. Traffic inspection is still possible; however, it just needs to be done on the endpoints before the traffic gets encrypted or after the traffic gets decrypted. In thinking about opportunities to do traffic inspection, it is important to distinguish between two cases: 1. Hop-by Hop Encryption In the hop-by-hop encryption case (for example, opportunistic SSL/TLS for SMTP2), traffic is encrypted and then decrypted for each hop (e.g., each link in the delivery chain). As a result, there are opportunities for filtering, and unfortunately, for eavesdropping or tampering at each intervening node. -
Applied Crypto Hardening
DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan Applied Crypto HarDENING WOLFGANG BrEyha, David Durvaux, TOBIAS Dussa, L. AarON Kaplan, Florian Mendel, Christian Mock, Manuel Koschuch, Adi Kriegisch, Ulrich Pöschl, Ramin Sabet, BerG San, Ralf Schlatterbeck, Thomas Schreck, AarON Zauner, Pepi Zawodsky (University OF Vienna, CERT.be, KIT-CERT, CERT.at, A-SIT/IAIK, CORetec.at, FH Campus Wien, VRVis, MilCERT Austria, A-Trust, Runtux.com, Friedrich-AleXANDER University Erlangen-NurEMBERg, azet.org, maclemon.at) January 13, 2014 DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan Do NOT TALK UNENCRYPTED Applied Crypto HarDENING • DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan PAGE 2 OF 81 DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan AcknoWLEDGEMENTS WE WOULD LIKE TO EXPRESS OUR THANKS TO THE FOLLOWING REVIEWERS AND PEOPLE WHO HAVE GENEROUSLY OffERED THEIR TIME AND INTEREST (in ALPHABETICAL ORder): BrOwn, Scott Millauer, TOBIAS Brulebois, Cyril O’Brien, Hugh Dirksen-Thedens, Mathis Pacher, Christoph DulaunoY, AleXANDRE Palfrader, Peter Gühring Philipp Pape, TOBIAS (layout) Grigg, IAN Petukhova, Anna (Logo) Horenbeck, Maarten Pichler, Patrick Huebl, AxEL Roeckx, Kurt Kovacic, Daniel Seidl, Eva (PDF layout) Lenzhofer, Stefan Wagner, Sebastian (“SEBIX”) Lorünser, Thomas Zangerl, AleXANDER The REVIEWERS DID REVIEW PARTS OF THE DOCUMENT IN THEIR AREA OF Expertise; ALL REMAINING ERRORS IN THIS DOCUMENT ARE THE SOLE RESPONSIBILITY OF THE PRIMARY authors. Applied Crypto HarDENING • DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan PAGE 3 OF 81 DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan DrAFT REvision: ea089c8 (2014-01-11 22:11:44 +0100) AarON Kaplan AbstrACT “Unfortunately, THE COMPUTER SECURITY AND CRYPTOLOGY COMMUNITIES HAVE DRIFTED APART OVER THE LAST 25 years. -
TAPS Working Group T. Pauly, Ed. Internet-Draft Apple Inc. Intended Status: Standards Track B
TAPS Working Group T. Pauly, Ed. Internet-Draft Apple Inc. Intended status: Standards Track B. Trammell, Ed. Expires: 13 January 2022 Google Switzerland GmbH A. Brunstrom Karlstad University G. Fairhurst University of Aberdeen C. Perkins University of Glasgow P. Tiesel SAP SE C.A. Wood Cloudflare 12 July 2021 An Architecture for Transport Services draft-ietf-taps-arch-11 Abstract This document describes an architecture for exposing transport protocol features to applications for network communication, the Transport Services architecture. The Transport Services Application Programming Interface (API) is based on an asynchronous, event-driven interaction pattern. It uses messages for representing data transfer to applications, and it describes how implementations can use multiple IP addresses, multiple protocols, and multiple paths, and provide multiple application streams. This document further defines common terminology and concepts to be used in definitions of Transport Services APIs and implementations. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." Pauly, et al. Expires 13 January 2022 [Page 1] Internet-Draft TAPS Architecture July 2021 This Internet-Draft will expire on 13 January 2022.