CPA-SC DESKTOP EMAIL ENCRYPTION 1.1 DOC Version 1.1
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SMTP Protocol
CS 280 Lecture 4: Application Layer, Email, DNS, P2P John Magee 21 September 2016 Most slides adapted from Kurose and Ross, Computer Networking 7/e Source material copyright 1996-2016 1 J.F Kurose and K.W. Ross Chapter 2: outline Last Class: 2.1 principles of network Next Class: applications 2.6 video streaming and 2.2 Web and HTTP content distribution networks Today: 2.7 socket programming with UDP and TCP 2.3 electronic mail • SMTP, POP3, IMAP 2.4 DNS 2.5 P2P applications Application Layer 2-2 outgoing Electronic mail message queue user mailbox Three major components: user agent . user agents . mail servers mail user server . simple mail transfer agent protocol: SMTP SMTP mail user server agent User Agent SMTP . a.k.a. “mail reader” SMTP user agent . composing, editing, reading mail server mail messages user . e.g., Outlook, Thunderbird, agent iPhone mail client user . outgoing, incoming agent messages stored on server Application Layer 2-3 Electronic mail: mail servers mail servers: user agent . mailbox contains incoming messages for user mail user server . message queue of outgoing agent (to be sent) mail messages SMTP mail user . SMTP protocol between server agent mail servers to send email SMTP messages SMTP user agent • client: sending mail mail server server • “server”: receiving mail user server agent user agent Application Layer 2-4 Electronic Mail: SMTP [RFC 2821] . uses TCP to reliably transfer email message from client to server, port 25 . direct transfer: sending server to receiving server . three phases of transfer • handshaking (greeting) • transfer of messages • closure . command/response interaction (like HTTP) • commands: ASCII text • response: status code and phrase . -
Statement from Directtrust Regarding the EFAIL Vulnerability
Statement from DirectTrust regarding the EFAIL Vulnerability Summary EFAIL is a set of attacks used to exploit vulnerabilities in email clients that decrypt and display PGP and S/MIME encrypted messages by coercing them into sending the decrypted text of the emails to an attacker. Properly implemented, Direct is NOT vulnerable. However, we recommend that if you are exchanging with anyone outside of the DirectTrust Network, you will want to understand at a reasonable depth how their implementation protects against EFAIL. How does EFAIL work? EFAIL consists of two different attack scenarios that create “backchannels” to send the decrypted text to an attacker. Both require an attacker to first obtain the encrypted message. 1. The attacker “wraps” the encrypted body with carefully crafted markup that can result in an email client decrypting the message and sending the decrypted body to the attacker. 2. The attacker manipulates the encrypted body of the message using well known S/MIME weaknesses that produce a message that can send the decrypted body to the attacker once rendered in the email client. Although the attacks are different, the end result is the same: a vulnerable email client sends the decrypted text to the attacker. How is this relevant to Direct? Direct uses S/MIME to encrypt messages, so in theory every Direct message could be vulnerable to this attack. However, Direct, when implemented correctly, is NOT vulnerable. The vulnerability is only applicable if decryption and rendering of the message are done in certain email clients like Thunderbird, iOS, Apple Mail, and some versions of Outlook. -
MTA STS Improving Email Security.Pdf
Improving Email Security with the MTA-STS Standard By Brian Godiksen An Email Best Practices Whitepaper CONTENTS Executive Overview 03 Why Does Email Need Encryption in Transit? 04 The Problem with “Opportunistic Encryption” 07 The Anatomy of a Man-in-the-Middle Attack 08 The Next Major Step with Email Encryption: MTA-STS 10 What Steps Should Senders Take to Adopt MTA-STS? 11 About SocketLabs 12 Brian Godiksen Brian has been helping organizations optimize email deliverability since joining SocketLabs in 2011. He currently manages a team of deliverability analysts that consult with customers on best infrastructure practices, including email authentication implementation, bounce processing, IP address warm-up, and email marketing list management. Brian leads the fight against spam and email abuse at SocketLabs by managing compliance across the platform. He is an active participant in key industry groups such as M3AAWG and the Email Experience Council. You can read more of Brian’s content here on the SocketLabs website. ©2019 SocketLabs 2 Executive The Edward Snowden leaks of 2013 opened many peoples’ eyes to the fact that mass surveillance was possible by Overview intercepting and spying on email transmissions. Today, compromised systems, database thefts, and technology breaches remain common fixtures in news feeds around the world. As a natural response, the technology industry is rabidly focused on improving the security and encryption of communications across all platforms. Since those early days of enlightenment, industry experts have discussed and attempted a variety of new strategies to combat “pervasive monitoring” of email channels. While pervasive monitoring assaults can take many forms, the most prominent forms of interference were man-in-the-middle (MitM) attacks. -
Zix Wins 5-Vendor Email Encryption Shootout Email Encryption Has Come a Long Way Since Our Last Review
Reprint THE CONNECTED ENTERPRISE MARCH 13, 2017 Zix wins 5-vendor email encryption shootout Email encryption has come a long way since our last review BY DAVID STROM, NETWORK WORLD terms of the flexibility of various encryption While these personal encryption products protocols used, along with DLP features that are improvements, there are also steps mail encryption products have are built-in along with a simple and single forward for the enterprise encryption email made major strides since we last pricing structure -- all things that Zix excels. user. Some products, such as Zix, hide the looked at them nearly two years All of these encryption products will cost encryption key process entirely from the ago. They have gotten easier you a few dollars a month per user. While user, so well that you might not even know to use and deploy, thanks to a that doesn’t sound like much, if you have that an encrypted message has passed from Ecombination of user interface and encryption an installation of several thousand users, sender to recipient. key management improvements, and are at the price tag could add up. However, the Others, such as Virtru and HPE/Voltage, the point where encryption can almost be alternative is having your email stream use identity-based encryption management called effortless on the part of the end user. available to anyone with a simple collection to verify a new recipient in their systems. Our biggest criticism in 2015 was that the of tools that even teens can master. Once a user new to these products products couldn’t cover multiple use cases, clicks on a confirmation email, they are such as when a user switches from reading Trends and bright spots forever allowed access, their emails are emails on their smartphone to moving to a In 2015, we said that gateways may have automatically decrypted, and there is no webmailer to composing messages on their fallen out of favor, but that trend has been need for any further effort to keep track of or Outlook desktop client. -
[Hal-00744922, V1] Improving Content Availability in the I2P Anonymous
Improving Content Availability in the I2P Anonymous File-Sharing Environment Juan Pablo Timpanaro, Isabelle Chrisment*, Olivier Festor INRIA Nancy-Grand Est, France *LORIA - ESIAL, Universit´ede Lorraine Email: fjuanpablo.timpanaro, [email protected] Email: [email protected] Abstract. Anonymous communication has gained more and more inter- est from Internet users as privacy and anonymity problems have emerged. Dedicated anonymous networks such as Freenet and I2P allow anony- mous file-sharing among users. However, one major problem with anony- mous file-sharing networks is that the available content is highly reduced, mostly with outdated files, and non-anonymous networks, such as the BitTorrent network, are still the major source of content: we show that in a 30-days period, 21648 new torrents were introduced in the BitTor- rent community, whilst only 236 were introduced in the anonymous I2P network, for four different categories of content. Therefore, how can a user of these anonymous networks access this varied and non-anonymous content without compromising its anonymity? In this paper, we improve content availability in an anonymous environment by proposing the first internetwork model allowing anonymous users to access and share content in large public communities while remaining anonymous. We show that our approach can efficiently interconnect I2P users and public BitTorrent swarms without affecting their anonymity nor their performance. Our model is fully implemented and freely usable. 1 Introduction Peer-to-peer file-sharing has always been one of the major sources of the Internet hal-00744922, version 1 - 24 Oct 2012 traffic, since its early beginnings in 2000. It has been moving from semi-central approaches (eDonkey2000, for example), to semi-decentralized approaches (Kazaa, for instance) to fully decentralized file-sharing architectures (like the KAD net- work). -
Security with SSH.Pdf
Security with SSH Network Startup Resource Center http://www.nsrc.org/ These materials are licensed under the Creative Commons Attribution-NonCommercial 4.0 International license (http://creativecommons.org/licenses/by-nc/4.0/) Topics • What is SSH • Where to get SSH • How to enable and configure SSH • Where to get SSH clients for Windows • Host keys: authentication of server to client • Issues to do with changing of the host key • Password authentication of client to server • Cryptographic authentication client to server • hostkey exchange, scp, and sftp labs What is SSH? From Wikipedia: Secure Shell (SSH) is a cryptographic network protocol for secure data communication, remote command-line login, remote command execution, and other secure network services between two networked computers that connects, via a secure channel over an insecure network, a server and a client (running SSH server and SSH client programs, respectively). i.e., ssh gives you a secure command line interface on remote machines… Topics • Where SSH applies directly to dealing with these two areas of security: - Confidentiality - Keeping our data safe from prying eyes • Authentication and Authorization - Is this person who they claim to be? - With keys alternative method to passwords Where to get SSH • First see if SSH is installed on your system and what version. Easiest way is: $ ssh ±V • Commonly used SSH in Linux and FreeBSD is OpenSSH. You can find the home page here: http://www.openssh.org/ • You can install OpenSSH via packages on Linux and FreeBSD. Ubuntu 12.04.3 LTS currently installs version 5.9p1 of OpenSSH. Obtain SSH Client for Windows There are several free, shareware, and commercial ssh clients for Windows. -
Imail V12 Web Client Help
Ipswitch, Inc. Web: www.imailserver.com 753 Broad Street Phone: 706-312-3535 Suite 200 Fax: 706-868-8655 Augusta, GA 30901-5518 Copyrights ©2011 Ipswitch, Inc. All rights reserved. IMail Server – Web Client Help This manual, as well as the software described in it, is furnished under license and may be used or copied only in accordance with the terms of such license. Except as permitted by such license, no part of this publication may be reproduced, photocopied, stored on a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, recording, or otherwise, without the expressed prior written consent of Ipswitch, Inc. The content of this manual is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Ipswitch, Inc. While every effort has been made to assure the accuracy of the information contained herein, Ipswitch, Inc. assumes no responsibility for errors or omissions. Ipswitch, Inc. also assumes no liability for damages resulting from the use of the information contained in this document. Ipswitch Collaboration Suite (ICS), the Ipswitch Collaboration Suite (ICS) logo, IMail, the IMail logo, WhatsUp, the WhatsUp logo, WS_FTP, the WS_FTP logos, Ipswitch Instant Messaging (IM), the Ipswitch Instant Messaging (IM) logo, Ipswitch, and the Ipswitch logo are trademarks of Ipswitch, Inc. Other products and their brands or company names are or may be trademarks or registered trademarks, and are the property of their respective companies. Update History December 2011 v12 April 2011 v11.5 October 2010 v11.03 May 2010 v11.02 Contents CHAPTER 1 Introduction to IMail Web Client About Ipswitch Web Messaging Help .................................................................................................................. -
Everyone's Guide to Bypassing Internet Censorship
EVERYONE’S GUIDE TO BY-PASSING INTERNET CENSORSHIP FOR CITIZENS WORLDWIDE A CIVISEC PROJECT The Citizen Lab The University of Toronto September, 2007 cover illustration by Jane Gowan Glossary page 4 Introduction page 5 Choosing Circumvention page 8 User self-assessment Provider self-assessment Technology page 17 Web-based Circumvention Systems Tunneling Software Anonymous Communications Systems Tricks of the trade page 28 Things to remember page 29 Further reading page 29 Circumvention Technologies Circumvention technologies are any tools, software, or methods used to bypass Inter- net filtering. These can range from complex computer programs to relatively simple manual steps, such as accessing a banned website stored on a search engine’s cache, instead of trying to access it directly. Circumvention Providers Circumvention providers install software on a computer in a non-filtered location and make connections to this computer available to those who access the Internet from a censored location. Circumvention providers can range from large commercial organi- zations offering circumvention services for a fee to individuals providing circumven- tion services for free. Circumvention Users Circumvention users are individuals who use circumvention technologies to bypass Internet content filtering. 4 Internet censorship, or content filtering, has become a major global problem. Whereas once it was assumed that states could not control Internet communications, according to research by the OpenNet Initiative (http://opennet.net) more than 25 countries now engage in Internet censorship practices. Those with the most pervasive filtering policies have been found to routinely block access to human rights organi- zations, news, blogs, and web services that challenge the status quo or are deemed threatening or undesirable. -
Designing a User Interface for the Innovative E-Mail Client Semester Thesis
Designing a User Interface for the Innovative E-mail Client Semester Thesis Student: Alexandra Burns Supervising Professor: Prof. Bertrand Meyer Supervising Assistants: Stephanie Balzer, Joseph N. Ruskiewicz December 2005 - April 2006 1 Abstract Email Clients have become a crucial application, both in business and for per- sonal use. The term information overload refers to the time consuming issue of keeping up with large amounts of incoming and stored email. Users face this problem on a daily basis and therefore benefit from an email client that allows them to efficiently search, display and store their email. The goal of this thesis is to build a graphical user interface for the innovative email client developed in a previous master thesis. It also explores the possibilities of designing a user interface outside of the business rules that apply for commercial solutions. 1 Contents 1 Introduction 4 2 Existing Work 6 2.1 ReMail ................................. 6 2.1.1 Methods ............................ 6 2.1.2 Problems Identified ...................... 7 2.1.3 Proposed Solutions ...................... 7 2.1.4 Assessment .......................... 8 2.2 Inner Circle .............................. 8 2.2.1 Methods ............................ 8 2.2.2 Problems Identified ...................... 9 2.2.3 Proposed Solutions ...................... 9 2.2.4 Assessment .......................... 10 2.3 TaskMaster .............................. 10 2.3.1 Methods ............................ 10 2.3.2 Problems Identified ...................... 11 2.3.3 Proposed Solution ...................... 11 2.3.4 Assessment .......................... 12 2.4 Email Overload ............................ 12 2.4.1 Methods ............................ 12 2.4.2 Problems Identified ...................... 13 2.4.3 Proposed Solutions ...................... 13 2.4.4 Assessment .......................... 14 3 Existing Solutions 16 3.1 Existing Email Clients ....................... -
2. Application Layer
2. Application Layer Computer Networking: A Top Down Approach th 6 edition Jim Kurose, Keith Ross Addison-Wesley March 2012 All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Application Layer 2-1 2. Application layer: Outline 2.1 principles of network 2.6 P2P applications applications 2.7 socket programming 2.2 Web and HTTP with UDP and TCP 2.3 FTP 2.4 electronic mail § SMTP, POP3, IMAP 2.5 DNS Application Layer 2-2 2. Application layer: Goals our goals: v learn about protocols by v conceptual, examining popular implementation aspects application-level of network application protocols protocols § HTTP § transport-layer § FTP service models § SMTP / POP3 / IMAP § client-server § DNS paradigm v creating network § peer-to-peer applications paradigm § socket API Application Layer 2-3 Some network apps v e-mail v voice over IP (e.g., Skype) v web v real-time video v text messaging conferencing v remote login v social networking v P2P file sharing v search v multi-user network games v … v streaming stored video v … (YouTube, Hulu, Netflix) Application Layer 2-4 Creating a network app application transport network data link write programs that: physical v run on (different) end systems v communicate over network v e.g., web server software communicates with browser software no need to write software for application transport network-core devices network data link application physical transport v network-core devices do not network data link run user applications physical v applications on end systems allows for rapid -
Peer to Peer Networks Contents
Peer to Peer Networks Contents The Client Explorer helps you manage all your client data files. Users on a network can Types of Network installs .................. 2 share the same database so that the index is constantly up-to-date for all to see, and files Network Configuration ...................... 3 never disappear in forgotten local folders. Client Explorer Server Install - Peer If you run ProFile on a network and intend to share databases or manage client files be- to Peer Networks ......................... 4 tween different workstations, you must install and configure a ProFile database server on Share database between worksta- at least one networked computer. The ProFile Server ensures that different machines can tions ............................................. 5 share Client Explorer data across the network. Note: If your computer is not on a network, Use ProFile on a Network ................. 6 you should not use the ProFile Server installer. The following instructions are intended for network administrators or for ProFile users who are knowledgeable in systems and network configuration. What can we share on our network? Network configuration Before installing on a network, make sure that your ProFile is designed for users in a network environment as well as licence agreement covers the number of users who will those on stand-alone workstations. On a network you may choose have access to the software. If you have any questions, any or all of these options: please call us at 1.800.452.9970 • Share the same ProFile program -
Configure Mac Mail 4.2 (And Higher) to Access Mcgill Email
Configure Mac Mail 4.2 (and higher) to access McGill email Note: These instructions use the recommended MS Exchange protocol, which gives you full access to the features of Exchange email, including the Global Address Book contacts and calendaring. However, if you wish, you may set up your email client using IMAP or POP protocol. For an overview of all email protocols, and the pros and cons of each, see Email 101 - fundamentals. 1. Launch Mail (.app) from the dock or from Applications folder. 2. In the Welcome screen: 1. Enter the following information: . Name: your full name, as you want mail recipients to see it. Email Address: your McGill email address ([email protected] or [email protected] - same as your McGill Username) Password: your McGill Password 2. After filling in the fields, hold down the Option and command keys at the same time before clicking Continue. 3. For the Incoming Mail Server, enter the following and then click Continue: o Account Type: select Exchange 2010. * Note: If you are using OS X 10.7 or 10.8, you will only have to select Exchange. o Description: Enter a description, such as "McGill Email". o Incoming Mail Server: "exchange.mcgill.ca" o User Name: your McGill Username o Password: your McGill Password o Address Book contacts and iCal calendars checkboxes are selected by default. You can deselect these choices if desired before clicking Continue. 4. The Account Summary screen should look like the screenshot below, with Take account online selected by default. Click Create. Note on attachments: The maximum size allowed for an attachment in Mac Mail is 5 MB.