Stronger Password Authentication Using Browser Extensions∗
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Confronting the Challenges of Participatory Culture: Media Education for the 21St Century
An occasional paper on digital media and learning Confronting the Challenges of Participatory Culture: Media Education for the 21st Century Henry Jenkins, Director of the Comparative Media Studies Program at the Massachusetts Institute of Technology with Katie Clinton Ravi Purushotma Alice J. Robison Margaret Weigel Building the new field of digital media and learning The MacArthur Foundation launched its five-year, $50 million digital media and learning initiative in 2006 to help determine how digital technologies are changing the way young people learn, play, socialize, and participate in civic life.Answers are critical to developing educational and other social institutions that can meet the needs of this and future generations. The initiative is both marshaling what it is already known about the field and seeding innovation for continued growth. For more information, visit www.digitallearning.macfound.org.To engage in conversations about these projects and the field of digital learning, visit the Spotlight blog at spotlight.macfound.org. About the MacArthur Foundation The John D. and Catherine T. MacArthur Foundation is a private, independent grantmaking institution dedicated to helping groups and individuals foster lasting improvement in the human condition.With assets of $5.5 billion, the Foundation makes grants totaling approximately $200 million annually. For more information or to sign up for MacArthur’s monthly electronic newsletter, visit www.macfound.org. The MacArthur Foundation 140 South Dearborn Street, Suite 1200 Chicago, Illinois 60603 Tel.(312) 726-8000 www.digitallearning.macfound.org An occasional paper on digital media and learning Confronting the Challenges of Participatory Culture: Media Education for the 21st Century Henry Jenkins, Director of the Comparative Media Studies Program at the Massachusetts Institute of Technology with Katie Clinton Ravi Purushotma Alice J. -
Intro to Cryptography 1 Introduction 2 Secure Password Manager
Programming Assignment 1 Winter 2021 CS 255: Intro to Cryptography Prof. Dan Boneh Due Monday, Feb. 8, 11:59pm 1 Introduction In many software systems today, the primary weakness often lies in the user’s password. This is especially apparent in light of recent security breaches that have highlighted some of the weak passwords people commonly use (e.g., 123456 or password). It is very important, then, that users choose strong passwords (or “passphrases”) to secure their accounts, but strong passwords can be long and unwieldy. Even more problematic, the user generally has many different services that use password authentication, and as a result, the user has to recall many different passwords. One way for users to address this problem is to use a password manager, such as LastPass and KeePass. Password managers make it very convenient for users to use a unique, strong password for each service that requires password authentication. However, given the sensitivity of the data contained in the password manager, it takes considerable care to store the information securely. In this assignment, you will be writing a secure and efficient password manager. In your implemen- tation, you will make use of various cryptographic primitives we have discussed in class—notably, authenticated encryption and collision-resistant hash functions. Because it is ill-advised to imple- ment 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 tem- plate, which you will be able to fill in to satisfy the functionality and security properties described below. -
User Authentication and Cryptographic Primitives
User Authentication and Cryptographic Primitives Brad Karp UCL Computer Science CS GZ03 / M030 16th November 2016 Outline • Authenticating users – Local users: hashed passwords – Remote users: s/key – Unexpected covert channel: the Tenex password- guessing attack • Symmetric-key-cryptography • Public-key cryptography usage model • RSA algorithm for public-key cryptography – Number theory background – Algorithm definition 2 Dictionary Attack on Hashed Password Databases • Suppose hacker obtains copy of password file (until recently, world-readable on UNIX) • Compute H(x) for 50K common words • String compare resulting hashed words against passwords in file • Learn all users’ passwords that are common English words after only 50K computations of H(x)! • Same hashed dictionary works on all password files in world! 3 Salted Password Hashes • Generate a random string of bytes, r • For user password x, store [H(r,x), r] in password file • Result: same password produces different result on every machine – So must see password file before can hash dictionary – …and single hashed dictionary won’t work for multiple hosts • Modern UNIX: password hashes salted; hashed password database readable only by root 4 Salted Password Hashes • Generate a random string of bytes, r Dictionary• For user password attack still x, store possible [H(r,x after), r] in attacker seespassword password file file! Users• Result: should same pick password passwords produces that different aren’t result close to ondictionary every machine words. – So must see password file -
M&A @ Facebook: Strategy, Themes and Drivers
A Work Project, presented as part of the requirements for the Award of a Master Degree in Finance from NOVA – School of Business and Economics M&A @ FACEBOOK: STRATEGY, THEMES AND DRIVERS TOMÁS BRANCO GONÇALVES STUDENT NUMBER 3200 A Project carried out on the Masters in Finance Program, under the supervision of: Professor Pedro Carvalho January 2018 Abstract Most deals are motivated by the recognition of a strategic threat or opportunity in the firm’s competitive arena. These deals seek to improve the firm’s competitive position or even obtain resources and new capabilities that are vital to future prosperity, and improve the firm’s agility. The purpose of this work project is to make an analysis on Facebook’s acquisitions’ strategy going through the key acquisitions in the company’s history. More than understanding the economics of its most relevant acquisitions, the main research is aimed at understanding the strategic view and key drivers behind them, and trying to set a pattern through hypotheses testing, always bearing in mind the following question: Why does Facebook acquire emerging companies instead of replicating their key success factors? Keywords Facebook; Acquisitions; Strategy; M&A Drivers “The biggest risk is not taking any risk... In a world that is changing really quickly, the only strategy that is guaranteed to fail is not taking risks.” Mark Zuckerberg, founder and CEO of Facebook 2 Literature Review M&A activity has had peaks throughout the course of history and different key industry-related drivers triggered that same activity (Sudarsanam, 2003). Historically, the appearance of the first mergers and acquisitions coincides with the existence of the first companies and, since then, in the US market, there have been five major waves of M&A activity (as summarized by T.J.A. -
To Change Your Ud Password(S)
TO CHANGE YOUR UD PASSWORD(S) The MyCampus portal allows the user a single-signon for campus applications. IMPORTANT NOTICE AT BOTTOM OF THESE INSTRUCTIONS !! INITIAL PROCEDURE TO ALLOW YOU TO CHANGE YOUR PASSWORD ON THE UD NETWORK : 1. In your web browser, enter http://mycampus.dbq.edu . If you are logging in for the first time, you will be directed to answer (3) security questions. Also, be sure to answer one of the recovery methods. 2. Once the questions are answered, you will click on SUBMIT and then CONTINUE and then YES. 3. In one location, you will now find MyUD, Campus Portal, Email and UDOnline (Moodle). 4. You can now click on any of these apps and you will be logged in already. The email link will prompt you for the password a second time until we get all accounts set up properly. YOU MUST BE SURE TO LOGOUT OF EACH APPLICATION AFTER YOU’RE DONE USING IT !! TO CHANGE YOUR PASSWORD: 1. After you have logged into the MyCampus.dbq.edu website, you will see your username in the upper- right corner of the screen. 2. Click on your name and then go into My Account. 3. At the bottom, you will click on Change Password and then proceed as directed. 4. You can now logout. You will need to use your new password on your next login. Password must be a minimum of 6 characters and contain 3 of the following 4 categories: - Uppercase character - Lowercase character - Number - Special character You cannot use the previous password You’ll be required to change your password every 180 days. -
Reset Forgotten Password with Office365
RESET FORGOTTEN PASSWORD 1. Go to https://login.microsoftonline.com 2. Click the link “Can’t access your account?” 3. Select Work or School account 4. Enter in your User ID with the @uamont.edu at the end and then enter the characters as seen in the picture. You can click the refresh button for a different set of letters. 5. You will have 3 options to verify your account and reset your password. This information was set up when you registered with self-service password reset. If you have not registered, please go to https://aka.ms/ssprsetup and enter in your information. A step by step guide on how to do this can be found here. a. Text your mobile phone b. Call your mobile phone c. Answer Security Questions 6. Choose one option and enter the information requested 7. Click Text for text my mobile phone, Call for call my mobile phone, or click Next when you’ve answered all security questions. a. If you have selected Text my mobile phone you will be required to enter in a verification code and click Next b. If you have select Call my mobile phone you will receive a call and will need to enter # to verify. 8. Enter in your new password and click Finish a. Note: If you receive the message, “Unfortunately, your password contains a word, phrase, or pattern that makes it easily guessable. Please try again with a different password.” Please try to create a password that does not use any dictionary words. b. Passwords must meet 3 of the 4 following requirements i. -
Optimizing a Password Hashing Function with Hardware-Accelerated Symmetric Encryption
S S symmetry Article Optimizing a Password Hashing Function with Hardware-Accelerated Symmetric Encryption Rafael Álvarez 1,* , Alicia Andrade 2 and Antonio Zamora 3 1 Departamento de Ciencia de la Computación e Inteligencia Artificial (DCCIA), Universidad de Alicante, 03690 Alicante, Spain 2 Fac. Ingeniería, Ciencias Físicas y Matemática, Universidad Central, Quito 170129, Ecuador; [email protected] 3 Departamento de Ciencia de la Computación e Inteligencia Artificial (DCCIA), Universidad de Alicante, 03690 Alicante, Spain; [email protected] * Correspondence: [email protected] Received: 2 November 2018; Accepted: 22 November 2018; Published: 3 December 2018 Abstract: Password-based key derivation functions (PBKDFs) are commonly used to transform user passwords into keys for symmetric encryption, as well as for user authentication, password hashing, and preventing attacks based on custom hardware. We propose two optimized alternatives that enhance the performance of a previously published PBKDF. This design is based on (1) employing a symmetric cipher, the Advanced Encryption Standard (AES), as a pseudo-random generator and (2) taking advantage of the support for the hardware acceleration for AES that is available on many common platforms in order to mitigate common attacks to password-based user authentication systems. We also analyze their security characteristics, establishing that they are equivalent to the security of the core primitive (AES), and we compare their performance with well-known PBKDF algorithms, such as Scrypt and Argon2, with favorable results. Keywords: symmetric; encryption; password; hash; cryptography; PBKDF 1. Introduction Key derivation functions are employed to obtain one or more keys from a master secret. This is especially useful in the case of user passwords, which can be of arbitrary length and are unsuitable to be used directly as fixed-size cipher keys, so, there must be a process for converting passwords into secret keys. -
Strong Password-Based Authentication in TLS Using the Three-Party Group Diffie–Hellman Protocol
284 Int. J. Security and Networks, Vol. 2, Nos. 3/4, 2007 Strong password-based authentication in TLS using the three-party group Diffie–Hellman protocol Michel Abdalla* École normale supérieure – CNRS, LIENS, Paris, France E-mail: [email protected] *Corresponding author Emmanuel Bresson Department of Cryptology, CELAR Technology Center, Bruz, France E-mail: [email protected] Olivier Chevassut Lawrence Berkeley National Laboratory, Berkeley, CA, USA E-mail: [email protected] Bodo Möller Horst Görtz Institute for IT Security, Ruhr-Universität Bochum, Bochum, Germany E-mail: [email protected] David Pointcheval École normale supérieure – CNRS, LIENS, Paris, France E-mail: [email protected] Abstract: The internet has evolved into a very hostile ecosystem where ‘phishing’ attacks are common practice. This paper shows that the three-party group Diffie-Hellman key exchange can help protect against these attacks. We have developed password-based ciphersuites for the Transport Layer Security (TLS) protocol that are not only provably secure but also believed to be free from patent and licensing restrictions based on an analysis of relevant patents in the area. Keywords: password authentication; group Diffie–Hellman key exchange; transport layer security; TLS. Reference to this paper should be made as follows: Abdalla, M., Bresson, E., Chevassut, O., Möller, B. and Pointcheval, D. (2007) ‘Strong password-based authentication in TLS using the three-party group Diffie-Hellman protocol’, Int. J. Security and Networks, Vol. 2, Nos. 3/4, pp.284–296. Biographical notes: Michel Abdalla is currently a Researcher with the Centre National de la Recherche Scientifique (CNRS), France and a Member of the Cryptography Team at the Ecole Normale Supérieure (ENS), France. -
Password Cracking
Password Cracking Sam Martin and Mark Tokutomi 1 Introduction Passwords are a system designed to provide authentication. There are many different ways to authenticate users of a system: a user can present a physical object like a key card, prove identity using a personal characteristic like a fingerprint, or use something that only the user knows. In contrast to the other approaches listed, a primary benefit of using authentication through a pass- word is that in the event that your password becomes compromised it can be easily changed. This paper will discuss what password cracking is, techniques for password cracking when an attacker has the ability to attempt to log in to the system using a user name and password pair, techniques for when an attacker has access to however passwords are stored on the system, attacks involve observing password entry in some way and finally how graphical passwords and graphical password cracks work. Figure 1: The flow of password attacking possibilities. Figure 1 shows some scenarios attempts at password cracking can occur. The attacker can gain access to a machine through physical or remote access. The user could attempt to try each possible password or likely password (a form of dictionary attack). If the attack can gain access to hashes of the passwords it is possible to use software like OphCrack which utilizes Rainbow Tables to crack passwords[1]. A spammer may use dictionary attacks to gain access to bank accounts or other 1 web services as well. Wireless protocols are vulnerable to some password cracking techniques when packet sniffers are able to gain initialization packets. -
Modified SHA1: a Hashing Solution to Secure Web Applications Through Login Authentication
36 International Journal of Communication Networks and Information Security (IJCNIS) Vol. 11, No. 1, April 2019 Modified SHA1: A Hashing Solution to Secure Web Applications through Login Authentication Esmael V. Maliberan Graduate Studies, Surigao del Sur State University, Philippines Abstract: The modified SHA1 algorithm has been developed by attack against the SHA-1 hash function, generating two expanding its hash value up to 1280 bits from the original size of different PDF files. The research study conducted by [9] 160 bit. This was done by allocating 32 buffer registers for presented a specific freestart identical pair for SHA-1, i.e. a variables A, B, C and D at 5 bytes each. The expansion was done by collision within its compression function. This was the first generating 4 buffer registers in every round inside the compression appropriate break of the SHA-1, extending all 80 out of 80 function for 8 times. Findings revealed that the hash value of the steps. This attack was performed for only 10 days of modified algorithm was not cracked or hacked during the experiment and testing using powerful online cracking tool, brute computation on a 64-GPU. Thus, SHA1 algorithm is not force and rainbow table such as Cracking Station and Rainbow anymore safe in login authentication and data transfer. For Crack and bruteforcer which are available online thus improved its this reason, there were enhancements and modifications security level compared to the original SHA1. being developed in the algorithm in order to solve these issues [10, 11]. [12] proposed a new approach to enhance Keywords: SHA1, hashing, client-server communication, MD5 algorithm combined with SHA compression function modified SHA1, hacking, brute force, rainbow table that produced a 256-bit hash code. -
Rootkits for Javascript Environments
Rootkits for JavaScript Environments Ben Adida Adam Barth Collin Jackson Harvard University UC Berkeley Stanford University ben [email protected] [email protected] [email protected] Abstract Web Site Bookmarklet Web Site Bookmarklet A number of commercial cloud-based password managers use bookmarklets to automatically populate and submit login forms. Unfortunately, an attacker web Native JavaScript environment site can maliciously alter the JavaScript environment and, when the login bookmarklet is invoked, steal the Figure 1. Developers assume the bookmarklet in- user’s passwords. We describe general attack tech- teracts with the native JavaScript environment directly niques for altering a bookmarklet’s JavaScript envi- (left). In fact, the bookmarklet’s environment can be ronment and apply them to extracting passwords from manipulated by the current web page (right). six commercial password managers. Our proposed solution has been adopted by several of the commercial vendors. If the user clicks a bookmarklet while visiting an untrusted web page, the bookmarklet’s JavaScript is run in the context of the malicious page, potentially 1. Introduction letting an attacker manipulate its execution by care- fully crafting its JavaScript environment, essentially One promising direction for building engaging web installing a “rootkit” in its own JavaScript environment experiences is to combine content and functionality (See Figure 1). Instead of interacting with the native from multiple sources, often called a “mashup.” In JavaScript objects, the bookmarklet interacts with the a traditional mashup, an integrator combines gadgets attacker’s objects. This attack vector is not much of (such as advertisements [1], maps [2], or contact a concern for Delicious’ social bookmarking service, lists [3]), but an increasingly popular mashup design because the site’s own interests are served by advertis- involves the user adding a bookmarklet [4] (also known ing its true location and title. -
At Uncw.Indd
5 Conference Titles • NCAA Appearances 5 2014 SCHEDULE College of Charleston COUGARS (31-13, 10-2) Overall 31-13 Home 24-6 VS CAA 10-2 Away 7-7 UNC-Wilmington SEAHAWKS (21-22, 6-7) Streak W4 Neutral 0-0 5/2 | UNCW | 6 p.m. | Wilmington, N.C. | Brooks Field Feb. 15 #12 North Carolina W, 7-4 5/3 | UNCW | 2 p.m. | Wilmington, N.C. | Brooks Field Feb. 16 #12 North Carolina L, 12-3 Feb. 17 #12 North Carolina W, 3-1 5/4 | UNCW | 2 p.m. | Wilmington, N.C. | Brooks Field Feb. 19 Charleston Southern W, 12-3 Feb. 21 Rhode Island W, 7-3 LAST TIME OUT GAME BREAKDOWN Feb. 22 Rhode Island W, 1-0 College of Charleston made program history Feb. 23 Rhode Island W, 7-4 on Sunday, defeating Bethune-Cookman, 3-2, Feb. 25 Charlotte W, 5-2 with a walk-off hit in the 11th inning to sweep Feb. 28 Marist W, 5-4 the series. College of Charleston recorded Mar 1 Marist W, 7-3 three straight walk-off wins in extra innings for Mar 2 Marist W, 7-0 the fi rst time in program history. Mar 4 Toledo L, 5-2 Mar 8 at The Citadel L, 5-4 (11) The Cougars (31-13) are now 3-1 in extra-inning Mar 9 The Citadel W, 11-5 games this year and have treated fans to four CHARLESTON UNC-WILMINGTON Mar 10 at The Citadel W. 8-0 walk-off wins at Patriots Point.