PGP Command Line User Guide
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MASTERCLASS GNUPG MASTERCLASS You Wouldn’T Want Other People Opening Your Letters and BEN EVERARD Your Data Is No Different
MASTERCLASS GNUPG MASTERCLASS You wouldn’t want other people opening your letters and BEN EVERARD your data is no different. Encrypt it today! SECURE EMAIL WITH GNUPG AND ENIGMAIL Send encrypted emails from your favourite email client. our typical email is about as secure as a The first thing that you need to do is create a key to JOHN LANE postcard, which is good news if you’re a represent your identity in the OpenPGP world. You’d Ygovernment agency. But you wouldn’t use a typically create one key per identity that you have. postcard for most things sent in the post; you’d use a Most people would have one identity, being sealed envelope. Email is no different; you just need themselves as a person. However, some may find an envelope – and it’s called “Encryption”. having separate personal and professional identities Since the early 1990s, the main way to encrypt useful. It’s a personal choice, but starting with a single email has been PGP, which stands for “Pretty Good key will help while you’re learning. Privacy”. It’s a protocol for the secure encryption of Launch Seahorse and click on the large plus-sign email that has since evolved into an open standard icon that’s just below the menu. Select ‘PGP Key’ and called OpenPGP. work your way through the screens that follow to supply your name and email address and then My lovely horse generate the key. The GNU Privacy Guard (GnuPG), is a free, GPL-licensed You can, optionally, use the Advanced Key Options implementation of the OpenPGP standard (there are to add a comment that can help others identify your other implementations, both free and commercial – key and to select the cipher, its strength and set when the PGP name now refers to a commercial product the key should expire. -
Wiretapping End-To-End Encrypted Voip Calls Real-World Attacks on ZRTP
Institute of Operating Systems and Computer Networks Wiretapping End-to-End Encrypted VoIP Calls Real-World Attacks on ZRTP Dominik Schürmann, Fabian Kabus, Gregor Hildermeier, Lars Wolf, 2017-07-18 wiretapping difficulty End-to-End Encryption SIP + DTLS-SRTP (SIP + Datagram Transport Layer Security-SRTP) End-to-End Encryption & Authentication SIP + SRTP + ZRTP Introduction Man-in-the-Middle ZRTP Attacks Conclusion End-to-End Security for Voice Calls Institute of Operating Systems and Computer Networks No End-to-End Security PSTN (Public Switched Telephone Network) SIP + (S)RTP (Session Initiation Protocol + Secure Real-Time Transport Protocol) 2017-07-18 Dominik Schürmann Wiretapping End-to-End Encrypted VoIP Calls Page 2 of 13 wiretapping difficulty End-to-End Encryption & Authentication SIP + SRTP + ZRTP Introduction Man-in-the-Middle ZRTP Attacks Conclusion End-to-End Security for Voice Calls Institute of Operating Systems and Computer Networks No End-to-End Security PSTN (Public Switched Telephone Network) SIP + (S)RTP (Session Initiation Protocol + Secure Real-Time Transport Protocol) End-to-End Encryption SIP + DTLS-SRTP (SIP + Datagram Transport Layer Security-SRTP) 2017-07-18 Dominik Schürmann Wiretapping End-to-End Encrypted VoIP Calls Page 2 of 13 wiretapping difficulty Introduction Man-in-the-Middle ZRTP Attacks Conclusion End-to-End Security for Voice Calls Institute of Operating Systems and Computer Networks No End-to-End Security PSTN (Public Switched Telephone Network) SIP + (S)RTP (Session Initiation Protocol + Secure Real-Time -
Encryption Procedure
Encrypting Software for Transmission to NIST 1. Scope NIST requires that all software submitted by the participants be signed and encrypted. Signing is done with the participant’s private key, and encrypting is done with the NIST project public key, which is published at http://www.nist.gov/itl/iad/ig/encrypt.cfm. NIST will validate all submitted materials using the participant’s public key, and the authenticity of that key will be verified using the key fingerprint. This fingerprint must be submitted to NIST as part of the signed participant agreement. By encrypting the submissions, we ensure privacy; by signing the submission, we ensure authenticity (the software actually belongs to the submitter). NIST will not take ownership of any submissions that are not signed and encrypted. All cryptographic operations (signing and encrypting) shall be performed with software that implements the OpenPGP standard, as described in Internet RFC 4880. The freely available Gnu Privacy Guard (GPG) software, available at www.gnupg.org, is one such implementation. 2. Submission of software to NIST NIST requires that all software submitted by the participants be signed and encrypted. Two keys pairs are needed: • Signing is done with the software provider's private key, and • Encryption is done with the NIST project public key, which is available at http://www.nist.gov/itl/iad/ig/encrypt.cfm 2.1. Project Specific Parameters The values for the project specific parameters (ProjectName, ProjectPublicKey, and ProjectEmail) mentioned in this document are found at http://www.nist.gov/itl/iad/ig/encrypt.cfm 1 2.2. Creating participant cryptographic key pair The steps below show how to create a public/private key pair and fingerprint using the GPG software. -
CS 255: Intro to Cryptography 1 Introduction 2 End-To-End
Programming Assignment 2 Winter 2021 CS 255: Intro to Cryptography Prof. Dan Boneh Due Monday, March 1st, 11:59pm 1 Introduction In this assignment, you are tasked with implementing a secure and efficient end-to-end encrypted chat client using the Double Ratchet Algorithm, a popular session setup protocol that powers real- world chat systems such as Signal and WhatsApp. As an additional challenge, assume you live in a country with government surveillance. Thereby, all messages sent are required to include the session key encrypted with a fixed public key issued by the government. In your implementation, you will make use of various cryptographic primitives we have discussed in class—notably, key exchange, public key encryption, digital signatures, and authenticated encryption. Because it is ill-advised to implement your own primitives in cryptography, you should use an established library: in this case, the Stanford Javascript Crypto Library (SJCL). We will provide starter code that contains a basic template, which you will be able to fill in to satisfy the functionality and security properties described below. 2 End-to-end Encrypted Chat Client 2.1 Implementation Details Your chat client will use the Double Ratchet Algorithm to provide end-to-end encrypted commu- nications with other clients. To evaluate your messaging client, we will check that two or more instances of your implementation it can communicate with each other properly. We feel that it is best to understand the Double Ratchet Algorithm straight from the source, so we ask that you read Sections 1, 2, and 3 of Signal’s published specification here: https://signal. -
FALL 2020 E-NEWSLETTER at Digital Mountain We Assist Our Clients with Their Computer Forensics, E-Discovery, Cybersecurity and Data Analytics Needs
FALL 2020 E-NEWSLETTER At Digital Mountain we assist our clients with their computer forensics, e-discovery, cybersecurity and data analytics needs. For this E-Newsletter, we focus on ephemeral communications and the affect of disappearing messages on discovery cases. Ephemeral Applications: Digital Trick or Treat The trick in trick or treating is one that has evolved from the neighbor who dons a monster mask when opening the door to the disappearance of peanut butter cups when Dad does the safety check of the night’s candy haul. Our digital communications have gone through an analogous transformation as we first marveled at how much data our devices could hold. Just as we upgraded from a small plastic pumpkin to a pillowcase for larger candy collections - we saved a growing plethora of emails, text messages, digital images, voice messages, and all manner of documents on mobile devices. Now, with the rise of discovery, we want our vulnerable data to disappear as if it were our least favorite candy. Ephemeral applications may be just the trick for that unwanted data. Call It What You Will There is no consensus about what constitutes an ephemeral application beyond the understanding that there is an element of impermanence. In 2016, three Georgia Tech College of Computing researchers proposed the creation of “ephemeral apps” that would allow users to engage with apps on a trial basis that would “pop-up instantaneously” on devices and then disappear after a certain period (https://www.cc.gatech.edu/~kbhardwa/papers/eapps.pdf). At the opposite end of the spectrum, in 2017 fan favorite Snapchat modified its app to allow recipients to determine when photographs and video would disappear rather than the burn after reading settings that propelled Snapchat’s rapid rise (https://www.vox.com/2017/5/9/15595040/snapchat-product-update-limitless-q1-earnings). -
IB Case Study Vocabulary a Local Economy Driven by Blockchain (2020) Websites
IB Case Study Vocabulary A local economy driven by blockchain (2020) Websites Merkle Tree: https://blockonomi.com/merkle-tree/ Blockchain: https://unwttng.com/what-is-a-blockchain Mining: https://www.buybitcoinworldwide.com/mining/ Attacks on Cryptocurrencies: https://blockgeeks.com/guides/hypothetical-attacks-on-cryptocurrencies/ Bitcoin Transaction Life Cycle: https://ducmanhphan.github.io/2018-12-18-Transaction-pool-in- blockchain/#transaction-pool 51 % attack - a potential attack on a blockchain network, where a single entity or organization can control the majority of the hash rate, potentially causing a network disruption. In such a scenario, the attacker would have enough mining power to intentionally exclude or modify the ordering of transactions. Block - records, which together form a blockchain. ... Blocks hold all the records of valid cryptocurrency transactions. They are hashed and encoded into a hash tree or Merkle tree. In the world of cryptocurrencies, blocks are like ledger pages while the whole record-keeping book is the blockchain. A block is a file that stores unalterable data related to the network. Blockchain - a data structure that holds transactional records and while ensuring security, transparency, and decentralization. You can also think of it as a chain or records stored in the forms of blocks which are controlled by no single authority. Block header – main way of identifying a block in a blockchain is via its block header hash. The block hash is responsible for block identification within a blockchain. In short, each block on the blockchain is identified by its block header hash. Each block is uniquely identified by a hash number that is obtained by double hashing the block header with the SHA256 algorithm. -
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 -
Internet Telephony with Linphone WELLWELL CONNECTEDCONNECTED
Linphone COVER STORY Internet telephony with Linphone WELLWELL CONNECTEDCONNECTED When you want to call your friends in distant countries, don’t pick up municate with the VoIP provider, so you will need to install the library first. To do the phone; just put on your headset and fire up Linphone. so, open a terminal window, then be- come root by typing su and supplying BY SIMONE SCHÄFER the root password. Unpack the archive by typing tar xzf libosip2-2.2.0.tar.gz, ne of the most popular methods wants to take incoming calls via Purtel. and then change to the new directory (cd for accessing Voice over IP tech- The procedures are similar for other pro- libosip2-2.2.0). The following commands Onology is through a so-called viders. will build and install the library: softphone. A softphone is simply a com- puter program running on your desktop Installation ./configure --prefix=/usr that handles call establishment and com- The source code for the 1.1.0 release, make munication. Linphone [1] is one of the and the libraries, are available on the most popular softphone applications for DVD with this issue below LinuxUser/ Phone Numbers and SIP Ids Linux. Linphone is optimized for the linphone/. In the simplest of all cases, the phone Gnome desktop, although that doesn’t Mandriva Linux 2006 has the current number will be a simple telephone num- mean you can’t run it on KDE. This arti- 1.1.0 version. Gentoo Linux users can ber followed by the SIP domain, such as cles describes how to install, configure, install Linphone 1.1.0 simply by running [email protected]. -
Adding Public Key Security to SSH
Adding Public Key Security to SSH A Thesis Submitted to the Faculty in partial fulfillment of the requirements for the degree of Master of Science in Computer Science by Yasir Ali DARTMOUTH COLLEGE Hanover, New Hampshire Feb, 20th, 2003 Examining Committee: ____________________________ Sean Smith (chair) ____________________________ Edward Feustel ____________________________ Christopher Hawblitzel !!!!!!!!!____________________________ !!!!!!!!!Carol Folt !!!!!!!!! Dean of Graduate Studies 1 2 Abstract SSH, the Secure Shell, is a popular software-based approach to network security. It is a protocol that allows user to log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another. It provides authentication and encrypted communications over unsecured channels. However, SSH protocol has an inherent security flaw. It is vulnerable to the “man-in-the- middle Attack”, when a user establishes his first SSH connection from a particular client to a remote machine. My thesis entails designing, evaluating and prototyping a public key infrastructure which can be used with the SSH2 protocol, in an academic setting, thus eliminating this vulnerability due to the man in the middle attack. The approach presented is different from the one that is based on the deployment of a Certificate Authority. My scheme does not necessarily require third party verification using a Certificate Authority; it is decentralized in nature and is relatively easy to set up. Keywords used: SSH, PKI, digital certificates, Certificate Authority, certification path, LDAP servers, Certificate Revocation List, X509v3 Certificate, OpenSSL, mutual authentication, and tunneled authentication. 3 Acknowledgments I want to thank Professor Sean Smith for his guidance, assistance and unremitting support over the last two years. -
Universal Leaky Random Oracle
Universal Leaky Random Oracle Guangjun Fan1, Yongbin Zhou2, Dengguo Feng1 1 Trusted Computing and Information Assurance Laboratory,Institute of Software,Chinese Academy of Sciences,Beijing,China [email protected] , [email protected] 2 State Key Laboratory of Information Security,Institute of Information Engineering,Chinese Academy of Sciences,Beijing,China [email protected] Abstract. Yoneyama et al. introduces the Leaky Random Oracle Model at ProvSec2008 to capture the leakages from the hash list of a hash func- tion used by a cryptography construction due to various attacks caused by sloppy usages or implementations in the real world. However, an im- portant fact is that such attacks would leak not only the hash list, but also other secret states (e.g. the secret key) outside the hash list. There- fore, the Leaky Random Oracle Model is very limited in the sense that it considers the leakages from the hash list alone, instead of taking into con- sideration other possible leakages from secret states simultaneously. In this paper, we present an augmented model of the Leaky Random Oracle Model. In our new model, both the secret key and the hash list can be leaked. Furthermore, the secret key can be leaked continually during the whole lifecycle of the cryptography construction. Hence, our new model is more universal and stronger than the Leaky Random Oracle Model and some other leakage models (e.g. only computation leaks model and memory leakage model). As an application example, we also present a public key encryption scheme which is provably IND-CCA secure in our new model. -
How Secure Is Textsecure?
How Secure is TextSecure? Tilman Frosch∗y, Christian Mainkay, Christoph Badery, Florian Bergsmay,Jorg¨ Schwenky, Thorsten Holzy ∗G DATA Advanced Analytics GmbH firstname.lastname @gdata.de f g yHorst Gortz¨ Institute for IT-Security Ruhr University Bochum firstname.lastname @rub.de f g Abstract—Instant Messaging has gained popularity by users without providing any kind of authentication. Today, many for both private and business communication as low-cost clients implement only client-to-server encryption via TLS, short message replacement on mobile devices. However, until although security mechanisms like Off the Record (OTR) recently, most mobile messaging apps did not protect confi- communication [3] or SCIMP [4] providing end-to-end con- dentiality or integrity of the messages. fidentiality and integrity are available. Press releases about mass surveillance performed by intelli- With the advent of smartphones, low-cost short-message gence services such as NSA and GCHQ motivated many people alternatives that use the data channel to communicate, to use alternative messaging solutions to preserve the security gained popularity. However, in the context of mobile ap- and privacy of their communication on the Internet. Initially plications, the assumption of classical instant messaging, fueled by Facebook’s acquisition of the hugely popular mobile for instance, that both parties are online at the time the messaging app WHATSAPP, alternatives claiming to provide conversation takes place, is no longer necessarily valid. secure communication experienced a significant increase of new Instead, the mobile context requires solutions that allow for users. asynchronous communication, where a party may be offline A messaging app that claims to provide secure instant for a prolonged time. -
Detecting and Preventing Active Attacks Against Autocrypt Release 0.10.0
Detecting and preventing active attacks against Autocrypt Release 0.10.0 NEXTLEAP researchers Jan 09, 2020 Contents 1 Introduction2 1.1 Attack model and terminology............................2 1.2 Problems of current key-verification techniques...................3 1.3 Integrating key verification with general workflows.................3 1.4 Supplementary key consistency through ClaimChains................4 1.5 Detecting inconsistencies through Gossip and DKIM................5 2 Securing communications against network adversaries6 2.1 Setup Contact protocol................................7 2.2 Verified Group protocol................................ 12 2.3 History-verification protocol............................. 17 2.4 Verifying keys through onion-queries......................... 20 3 Key consistency with ClaimChains 23 3.1 High level overview of the ClaimChain design.................... 23 3.2 Use and architecture................................. 24 3.3 Evaluating ClaimChains to guide verification.................... 26 4 Using Autocrypt key gossip to guide key verification 28 4.1 Attack Scenarios................................... 28 4.2 Probability of detecting an attack through out of band verification......... 29 5 Using DKIM signature checks to guide key verification 32 5.1 DKIM Signatures on Autocrypt Headers....................... 32 5.2 Device loss and MITM attacks............................ 33 5.3 Open Questions.................................... 34 1 1 Introduction This document considers how to secure Autocrypt1-capable mail apps against active network at- tackers. Autocrypt aims to achieve convenient end-to-end encryption of e-mail. The Level 1 Autocrypt specification offers users opt-in e-mail encryption, but only considers passive adver- saries. Active network adversaries, who could, for example, tamper with the Autocrypt header during e-mail message transport, are not considered in the Level 1 specification. Yet, such active attackers might undermine the security of Autocrypt.