ECE 646 Lecture 3. Key management. Required Reading. Using Session Keys & Key Encryption Keys. Using the same key for multiple messages
|
|
|
- Merry Daniel
- 6 years ago
- Views:
Transcription
1 ECE 646 Lecture 3 Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E management Chapter 14 Management and Distribution Using the same for multiple messages Using Session s & Encryption s K 1 K 2 K 3 M 1 M 2 M 3 M 4 M 5 E KEK E KEK (K 1 ) E KEK (K 2 ) E KEK (K 3 ) E K M 1 M 2 M 3 M 4 M 5 E K1 E K2 E K3 C 1 C 2 C 3 C 4 C 5 C 1 C 2 C 3 C 4 C 5 Control Vector Master Session Control Vector Master Encrypted Session Distribution Center (KDC) Hashing Hashing K -KDC C Encryption Encrypted Session Plaintext (a) Control Vector Encryption Decryption Session (b) Control Vector Decryption Ciphertext Control Figure Vector 14.6 Control Encryption Vector and Decryption Decryption K -KDC KDC E K E-KDC D 1
2 Simple establishment protocol based on KDC establishment protocol based on KDC KDC K -KDC... KDC K -KDC... (1) let me talk with (2b) (, K ) (1) let me talk with (2a) K -KDC (, K ) (2) K -KDC (, K, ticket ) (3) ticket = (, K ) K -KDC K -KDC agreement Diffie-Hellman agreement scheme s s x a, q - global public elements x s s y = a x mod q y = a x mod q x x S = y mod q S = y mod q of and of and K K Man-in-the-middle attack s s Does cryptography have an chilles heel? s s, send me your, C s public C s public s, message encrypted using s of and C of and C 2
3 Does cryptography have an chilles heel? Does cryptography have an chilles heel?, send me your,, send me your, s, s, s s message encrypted using s s message encrypted using s s message reencrypted using s Directory of s (1) Directory of s (2), s, s, s, s Dave, Dave s Eve, Eve s, s s, s, s, s Dave, Dave s Eve, Eve s message encrypted using s message encrypted using s s Directory of s (3) PGP: Flow of trust, s s message encrypted using s, s, s, s Dave, Dave s Eve, Eve s message reencrypted using s Manual exchange of s: (Washington) Las Vegas Û David David (New York) David, send me etty s etty s signed by David Edinburgh David Û etty message encrypted using etty s etty (London) 3
![(OU) = ECE [Stallings, 2010] Other fields permitted: Street address (S) Post office box (PO ox) Postal code (PC) Title (T) Description (D) Telephone number (TN) Serial number (SN) Examples of X.](/docs-images/76/74038128/images/4-2.jpg "509 version extensions usage: Restrictions on the use of a given, e.g., digital signature, encryption, data encryption, agreement.")
4 Certification uthority Loren Kohnfelder, Towards a Practical Public- Cryptosystem, achelor s Thesis, MIT, May Subject name Subject s Certificate Subject s Credentials Proof of identity Public of Certification uthority Certificate Public of Certification uthority Serial number Issuer (C) name Period of validity Signature algorithm identifier C s signature The exact X.509 Certificate Format Distinguished Name (DN) according to X.500 Example: Common name (CN) = Kris Gaj Country name (C) = US State or province name (ST) = V Locality name (L) = Fairfax Organization name (O) = George Mason University Organizational unit name (OU) = ECE [Stallings, 2010] Other fields permitted: Street address (S) Post office box (PO ox) Postal code (PC) Title (T) Description (D) Telephone number (TN) Serial number (SN) Examples of X.509 version extensions usage: Restrictions on the use of a given, e.g., digital signature, encryption, data encryption, agreement. Subject identifier: subject may have different pairs for different purposes (e.g., digital signature, agreement). Private usage period: Period of use of the corresponding. Subject alternative name: pplication specific name, e.g. address. asic constraints: Identifies if the subject may act as a C. 4
5 Non-repudiation only M, SGN (M), Cert C (, KU ) s - KR C s - KU C Cert C (, KU ) Confidentiality only Cert C (, KU ) Cert C (, KU ) Cert C (C, KU C ) Cert C (D, KU D ) Notation: KU X - of X KR X - of X SGN X (M) - signature of X for the message M Cert Y (X, KU X ) - certificate issued by Y for the user X K (M), KU (K ) C s - KU C s - KR Confidentiality and Non-repudiation Cert C (, KU ) Cert C (, KU ) Cert C (, KU ) Cert C (C, KU C ) Cert C (D, KU D ) Public Infrastructure with Reverse Certificates Fairfax US V M C Herndon Worcester oston Santa Clara San Jose SGN (M), Cert C (, KU ), K (M), KU (K ) s - KR C s - KU C s - KR C s - KU C GMU MIT knows KU GMU knows KU MIT M, SGN (M), Cert GMU (, KU ), Cert Fairfax (GMU, KU GMU ), Cert V (Fairfax, KU Fairfax ), Cert US (V, KU V ), Cert M (US, KU US ), Cert oston (M, KU M ), Cert MIT (oston, KU oston ) Public Infrastructure with Strict Hierarchy Public Infrastructure with Cross-Certificates US V M C Cert GMU (MIT, KU MIT ) Cert MIT (GMU, KU GMU ) Fairfax GMU Herndon Worcester oston MIT Santa Clara San Jose GMU knows KU GMU MIT knows KU MIT ll users know KU US M, SGN (M), Cert GMU (, KU ), Cert Fairfax (GMU, KU GMU ), Cert V (Fairfax, KU Fairfax ), Cert US (V, KU V ), M, SGN (M), Cert GMU (, KU ), Cert MIT (GMU, KU GMU ) 5
6 Certificate Revocation Lists (CRLs) This update date Next update date Issuer (C) name List of revoked certificates (serial number + revocation date) Signature algorithm C s signature The exact X.509 CRL Format Certificate is valid if it has a valid signature of C did not expire is not listed in the C s most recent CRL [Stallings, 2006] dvantages of Certification uthorities over Distribution Centers C does not need to be on-line C is relatively easy to implement C crash = no new users in the network but all old users operate normally certificates are not security sensitive, they can be stored in a public, and transmitted over a public network compromised C cannot decrypt messages (without first impersonating one of the users) only active attacks can be mounted using Cs s static s ephemeral uthenticated agreement s ephemeral s static certificates s static s ephemeral s static s ephemeral s static x s ephemeral uthenticated agreement s ephemeral r s static s static y certificates y p x Z = y p r p x r Z = y p r x s ephemeral s static s ephemeral Station-to-Station (STS) Protocol uthenticated agreement with confirmation y y, K (SGN (y, y )), Cert C (, KU )) K (SGN (y, y )), Cert C (, KU )) KR static of KU C static of C Cert C (, KU )) certificate of issued by C Notation: KU Z static of Z KR Z static of Z x Z ephemeral of Z y Z ephemeral of Z KR static of KU C static of C Cert C (, KU )) certificate of issued by C SGN Z (M) - signature of Z for the message M Cert C (Z, KU Z ) certificate of Z issued by C 6
Key management. Required Reading. Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E
ECE 646 Lecture 3 Key management Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E Chapter 14 Key Management and Distribution 1 Using the same key for multiple
ECE 646 Lecture 3. Key management. Required Reading. Using the same key for multiple messages
ECE 646 Lecture 3 Key management Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E Chapter 14 Key Management and Distribution Using the same key for multiple
ECE 646 Lecture 3. Key management
ECE 646 Lecture 3 Key management Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E Chapter 14 Key Management and Distribution Using the same key for multiple
Key management. Pretty Good Privacy
ECE 646 - Lecture 4 Key management Pretty Good Privacy Using the same key for multiple messages M 1 M 2 M 3 M 4 M 5 time E K time C 1 C 2 C 3 C 4 C 5 1 Using Session Keys & Key Encryption Keys K 1 K 2
Key Management and Distribution
Key Management and Distribution Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-14/
Cryptography and Network Security Chapter 14
Cryptography and Network Security Chapter 14 Fifth Edition by William Stallings Lecture slides by Lawrie Brown Chapter 14 Key Management and Distribution No Singhalese, whether man or woman, would venture
T Cryptography and Data Security
T-79.4501 Cryptography and Data Security Lecture 10: 10.1 Random number generation 10.2 Key management - Distribution of symmetric keys - Management of public keys Stallings: Ch 7.4; 7.3; 10.1 1 The Use
Cristina Nita-Rotaru. CS355: Cryptography. Lecture 17: X509. PGP. Authentication protocols. Key establishment.
CS355: Cryptography Lecture 17: X509. PGP. Authentication protocols. Key establishment. Public Keys and Trust Public Key:P A Secret key: S A Public Key:P B Secret key: S B How are public keys stored How
T Cryptography and Data Security
T-79.159 Cryptography and Data Security Lecture 10: 10.1 Random number generation 10.2 Key management - Distribution of symmetric keys - Management of public keys Kaufman et al: Ch 11.6; 9.7-9; Stallings:
Key Management and Distribution
2 and Distribution : Security and Cryptography Sirindhorn International Institute of Technology Thammasat University Prepared by Steven Gordon on 20 December 2015 css441y15s2l10, Steve/Courses/2015/s2/css441/lectures/key-management-and-distribution.tex,
Acknowledgments. CSE565: Computer Security Lectures 16 & 17 Authentication & Applications
CSE565: Computer Security Lectures 16 & 17 Authentication & Applications Shambhu Upadhyaya Computer Science & Eng. University at Buffalo Buffalo, New York 14260 Lec 16.1 Acknowledgments Material for some
Cryptography and Network Security
Cryptography and Network Security Third Edition by William Stallings Lecture slides by Lawrie Brown Chapter 14 Authentication Applications We cannot enter into alliance with neighbouring princes until
Overview of Authentication Systems
Overview of Authentication Systems Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-07/
Lecture Notes 14 : Public-Key Infrastructure
6.857 Computer and Network Security October 24, 2002 Lecture Notes 14 : Public-Key Infrastructure Lecturer: Ron Rivest Scribe: Armour/Johann-Berkel/Owsley/Quealy [These notes come from Fall 2001. These
Chapter 9: Key Management
Chapter 9: Key Management Session and Interchange Keys Key Exchange Cryptographic Key Infrastructure Storing and Revoking Keys Digital Signatures Slide #9-1 Overview Key exchange Session vs. interchange
X.509. CPSC 457/557 10/17/13 Jeffrey Zhu
X.509 CPSC 457/557 10/17/13 Jeffrey Zhu 2 3 X.509 Outline X.509 Overview Certificate Lifecycle Alternative Certification Models 4 What is X.509? The most commonly used Public Key Infrastructure (PKI) on
Lecture 13. Public Key Distribution (certification) PK-based Needham-Schroeder TTP. 3. [N a, A] PKb 6. [N a, N b ] PKa. 7.
![Lecture 13. Public Key Distribution (certification) PK-based Needham-Schroeder TTP. 3. [N a, A] PKb 6. [N a, N b ] PKa. 7.](/thumbs/84/91191448.jpg "Lecture 13. Public Key Distribution (certification) PK-based Needham-Schroeder TTP. 3. [N a, A] PKb 6. [N a, N b ] PKa. 7.")
Lecture 13 Public Key Distribution (certification) 1 PK-based Needham-Schroeder TTP 1. A, B 4. B, A 2. {PKb, B}SKT B}SKs 5. {PK a, A} SKT SKs A 3. [N a, A] PKb 6. [N a, N b ] PKa B 7. [N b ] PKb Here,
Diffie-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
Cryptographic Protocols 1
Cryptographic Protocols 1 Luke Anderson luke@lukeanderson.com.au 5 th May 2017 University Of Sydney Overview 1. Crypto-Bulletin 2. Problem with Diffie-Hellman 2.1 Session Hijacking 2.2 Encrypted Key Exchange
KEY AGREEMENT PROTOCOLS. CIS 400/628 Spring 2005 Introduction to Cryptography. This is based on Chapter 13 of Trappe and Washington
KEY AGREEMENT PROTOCOLS CIS 400/628 Spring 2005 Introduction to Cryptography This is based on Chapter 13 of Trappe and Washington DIFFIE-HELLMAN KEY EXCHANGE Alice & want to exchange a ton of data using
Public 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
Key Agreement Schemes
Key Agreement Schemes CSG 252 Lecture 9 November 25, 2008 Riccardo Pucella Key Establishment Problem PK cryptosystems have advantages over SK cryptosystems PKCs do not need a secure channel to establish
Network Security Essentials
Network Security Essentials Fifth Edition by William Stallings Chapter 4 Key Distribution and User Authentication No Singhalese, whether man or woman, would venture out of the house without a bunch of
Cryptology Part 1. Terminology. Basic Approaches to Cryptography. Basic Approaches to Cryptography: (1) Transposition (continued)
Cryptology Part 1 Uses of Cryptology 1. Transmission of a message with assurance that the contents will be known only by sender and recipient a) Steganography: existence of the message is hidden b) Cryptography:
What 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
Cryptography and Network Security
Cryptography and Network Security Spring 2012 http://users.abo.fi/ipetre/crypto/ Lecture 8: Protocols for public-key management Ion Petre Department of IT, Åbo Akademi University 1 Key management two problems
Computer 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
ECE 646 Lecture 4. Pretty Good Privacy PGP
ECE 646 Lecture 4 Pretty Good Privacy PGP Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 6/E or 7/E Chapter 19.1 Pretty Good Privacy (PGP) On-line Chapters (available
Authentication in Distributed Systems
Authentication in Distributed Systems Introduction Crypto transforms (communications) security problems into key management problems. To use encryption, digital signatures, or MACs, the parties involved
Lecture 4: Cryptography III; Security. Course Administration
Lecture 4: Cryptography III; Email Security CS 336/536: Computer Network Security Fall 2014 Nitesh Saxena Course Administration HW/Lab 1 Posted Due at 11am on Sep 29 Labs are active starting this week
Lecture 15 Public Key Distribution (certification)
0 < i < 2 n = N X i,y i random secret keys index i = random (secret) value Merkle s Puzzles (1974) Puzzle P i = {index i,x i,s} Y i S fixed string, e.g., " Alice to Bob" { P 0 < i < 2 i n } Pick random
Topics. Dramatis Personae Cathy, the Computer, trusted 3 rd party. Cryptographic Protocols
Cryptographic Protocols Topics 1. Dramatis Personae and Notation 2. Session and Interchange Keys 3. Key Exchange 4. Key Generation 5. Cryptographic Key Infrastructure 6. Storing and Revoking Keys 7. Digital
Lecture 2 Applied Cryptography (Part 2)
Lecture 2 Applied Cryptography (Part 2) Patrick P. C. Lee Tsinghua Summer Course 2010 2-1 Roadmap Number theory Public key cryptography RSA Diffie-Hellman DSA Certificates Tsinghua Summer Course 2010 2-2
Issues. Separation of. Distributed system security. Security services. Security policies. Security mechanism
Module 9 - Security Issues Separation of Security policies Precise definition of which entities in the system can take what actions Security mechanism Means of enforcing that policy Distributed system
Digital Certificates Demystified
Digital Certificates Demystified Ross Cooper, CISSP IBM Corporation RACF/PKI Development Poughkeepsie, NY Email: rdc@us.ibm.com August 9 th, 2012 Session 11622 Agenda Cryptography What are Digital Certificates
CT30A8800 Secured communications
CT30A8800 Secured communications Pekka Jäppinen October 31, 2007 Pekka Jäppinen, Lappeenranta University of Technology: October 31, 2007 Secured Communications: Key exchange Schneier, Applied Cryptography:
Course Administration
Lecture 6: Hash Functions, Message Authentication and Key Distribution CS 392/6813: Computer Security Fall 2010 Nitesh Saxena *Adopted from Previous Lectures by Nasir Memon Course Administration HW3 was
CSC 482/582: Computer Security. Security Protocols
Security Protocols Topics 1. Basic Concepts of Cryptography 2. Security Protocols 3. Authentication Protocols 4. Key Exchange Protocols 5. Kerberos 6. Public Key Infrastructure Encryption and Decryption
Spring 2010: CS419 Computer Security
Spring 2010: CS419 Computer Security Vinod Ganapathy Lecture 7 Topic: Key exchange protocols Material: Class handout (lecture7_handout.pdf) Chapter 2 in Anderson's book. Today s agenda Key exchange basics
KEY DISTRIBUTION AND USER AUTHENTICATION
KEY DISTRIBUTION AND USER AUTHENTICATION Key Management and Distribution No Singhalese, whether man or woman, would venture out of the house without a bunch of keys in his hand, for without such a talisman
Pretty Good Privacy PGP. Required Reading. Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E
ECE 646 Lecture 4 Pretty Good Privacy PGP Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E Chapter 18.1 or 19.1 Pretty Good Privacy (PGP) On-line Chapters
Certificates, Certification Authorities and Public-Key Infrastructures
(Digital) Certificates Certificates, Certification Authorities and Public-Key Infrastructures We need to be sure that the public key used to encrypt a message indeed belongs to the destination of the message
Introduction to Network Security Missouri S&T University CPE 5420 Key Management and Distribution
Introduction to Network Security Missouri S&T University CPE 5420 Key Management and Distribution Egemen K. Çetinkaya Egemen K. Çetinkaya Department of Electrical & Computer Engineering Missouri University
Total points: 71. Total time: 75 minutes. 9 problems over 7 pages. No book, notes, or calculator
CMSC 414 F08 Exam 1 Page 1 of 10 Name: Total points: 71. Total time: 75 minutes. 9 problems over 7 pages. No book, notes, or calculator 1. [14 points] a. Are n=221 and e=3 valid numbers for RSA. Explain.
Key Management. Digital signatures: classical and public key Classic and Public Key exchange. Handwritten Signature
Key Management Digital signatures: classical and public key Classic and Public Key exchange 1 Handwritten Signature Used everyday in a letter, on a check, sign a contract A signature on a signed paper
X.509 CERTIFICATE X.509 CERTIFICATE PUBLIC-KEY CERTIFICATES THE CERTIFICATE TRIANGLE CERTIFICATE TRUST. INFS 766 Internet Security Protocols
INFS 766 Internet Security Protocols X.509 CERTIFICATE Lecture 6 Digital Certificates VERSION SERIAL NUMBER SIGNATURE ALGORITHM ISSUER VALIDITY Prof. Ravi SUBJECT SUBJECT PUBLIC KEY INFO SIGNATURE 4 PUBLIC-KEY
CSE 565 Computer Security Fall 2018
CSE 565 Computer Security Fall 2018 Lecture 11: Public Key Infrastructure Department of Computer Science and Engineering University at Buffalo 1 Lecture Outline Public key infrastructure Certificates Trust
Authentication 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
PUBLIC-KEY CERTIFICATES
INFS 766 Internet Security Protocols Lecture 6 Digital Certificates Prof. Ravi Sandhu PUBLIC-KEY CERTIFICATES reliable distribution of public-keys public-key encryption sender needs public key of receiver
ECE 646 Fall 2008 Multiple-choice test
ECE 646 Fall 2008 Multiple-choice test 1. (1 pt) Arrange the following ciphers in the order of the increasing measure of roughness for the ciphertext obtained by encrypting 1000-letter message with a given
Datasäkerhetsmetoder föreläsning 7
Datasäkerhetsmetoder föreläsning 7 Nyckelhantering Jan-Åke Larsson Cryptography A security tool, not a general solution Cryptography usually converts a communication security problem into a key management
Digital Signatures. Public-Key Signatures. Arbitrated Signatures. Digital Signatures With Encryption. Terminology. Message Authentication Code (MAC)
Message Authentication Code (MAC) Key-dependent one-way hash function Only someone with a correct key can verify the hash value Easy way to turn one-way hash function into MAC is to encrypt hash value
Overview. Cryptographic key infrastructure Certificates. May 13, 2004 ECS 235 Slide #1. Notation
Overview Key exchange Session vs. interchange keys Classical, public key methods Key generation Cryptographic key infrastructure Certificates Key storage Key escrow Key revocation Digital signatures May
ICS 180 May 4th, Guest Lecturer: Einar Mykletun
ICS 180 May 4th, 2004 Guest Lecturer: Einar Mykletun 1 Symmetric Key Crypto 2 Symmetric Key Two users who wish to communicate share a secret key Properties High encryption speed Limited applications: encryption
1. Diffie-Hellman Key Exchange
e-pgpathshala Subject : Computer Science Paper: Cryptography and Network Security Module: Diffie-Hellman Key Exchange Module No: CS/CNS/26 Quadrant 1 e-text Cryptography and Network Security Objectives
UNIT - IV Cryptographic Hash Function 31.1
UNIT - IV Cryptographic Hash Function 31.1 31-11 SECURITY SERVICES Network security can provide five services. Four of these services are related to the message exchanged using the network. The fifth service
Cryptography III. Public-Key Cryptography Digital Signatures. 2/1/18 Cryptography III
Cryptography III Public-Key Cryptography Digital Signatures 2/1/18 Cryptography III 1 Public Key Cryptography 2/1/18 Cryptography III 2 Key pair Public key: shared with everyone Secret key: kept secret,
Security Handshake Pitfalls
Hello Challenge R f(k, R f(k, R Problems: 1. Authentication is not mutual only authenticates Anyone can send the challenge R. f(k, R Problems: 1. Authentication is not mutual only authenticates Anyone
Dr. 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 Security Handshake Pitfalls Login only Mutual
CSC 5930/9010 Modern Cryptography: Public-Key Infrastructure
CSC 5930/9010 Modern Cryptography: Public-Key Infrastructure Professor Henry Carter Fall 2018 Recap Digital signatures provide message authenticity and integrity in the public-key setting As well as public
Sankalchand Patel College of Engineering, Visnagar Department of Computer Engineering & Information Technology. Question Bank
Sankalchand Patel College of Engineering, Visnagar Department of Computer Engineering & Information Technology Question Bank Subject: Information Security (160702) Class: BE Sem. VI (CE/IT) Unit-1: Conventional
Cryptography 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
Secure Sockets Layer (SSL) / Transport Layer Security (TLS)
Secure Sockets Layer (SSL) / Transport Layer Security (TLS) Brad Karp UCL Computer Science CS GZ03 / M030 20 th November 2017 What Problems Do SSL/TLS Solve? Two parties, client and server, not previously
Chapter 10: Key Management
Chapter 10: Key Management Session and Interchange Keys Key Exchange Key Generation Cryptographic Key Infrastructure Storing and Revoking Keys Digital Signatures Slide #10-1 Overview Key exchange Session
CIS 4360 Secure Computer Systems Applied Cryptography
CIS 4360 Secure Computer Systems Applied Cryptography Professor Qiang Zeng Spring 2017 Symmetric vs. Asymmetric Cryptography Symmetric cipher is much faster With asymmetric ciphers, you can post your Public
Lecture Note 6 KEY MANAGEMENT. Sourav Mukhopadhyay
Lecture Note 6 KEY MANAGEMENT Sourav Mukhopadhyay Cryptography and Network Security - MA61027 Key Management There are actually two distinct aspects to the use of public-key encryption in this regard:
Background. Network Security - Certificates, Keys and Signatures - Digital Signatures. Digital Signatures. Dr. John Keeney 3BA33
Background Network Security - Certificates, Keys and Signatures - Dr. John Keeney 3BA33 Slides Sources: Karl Quinn, Donal O Mahoney, Henric Johnson, Charlie Kaufman, Wikipedia, Google, Brian Raiter. Recommended
CSC/ECE 774 Advanced Network Security
Computer Science CSC/ECE 774 Advanced Network Security Topic 2. Network Security Primitives CSC/ECE 774 Dr. Peng Ning 1 Outline Absolute basics Encryption/Decryption; Digital signatures; D-H key exchange;
Verteilte Systeme (Distributed Systems)
Verteilte Systeme (Distributed Systems) Lorenz Froihofer l.froihofer@infosys.tuwien.ac.at http://www.infosys.tuwien.ac.at/teaching/courses/ VerteilteSysteme/ Security Threats, mechanisms, design issues
ECE 646 Lecture 4A. Pretty Good Privacy PGP. Short History of PGP based on the book Crypto by Steven Levy. Required Reading
ECE 646 Lecture 4A Pretty Good Privacy PGP Required Reading Stallings, Cryptography and Network Security: Principles and Practice, 5/E or 6/E Chapter 18.1 or 19.1 Pretty Good Privacy (PGP) On-line Chapters
Authentication in real world: Kerberos, SSH and SSL. Zheng Ma Apr 19, 2005
Authentication in real world: Kerberos, SSH and SSL Zheng Ma Apr 19, 2005 Where are we? After learning all the foundation of modern cryptography, we are ready to see some real world applications based
Other Uses of Cryptography. Cryptography Goals. Basic Problem and Terminology. Other Uses of Cryptography. What Can Go Wrong? Why Do We Need a Key?
ryptography Goals Protect private communication in the public world and are shouting messages over a crowded room no one can understand what they are saying 1 Other Uses of ryptography Authentication should
Crypto meets Web Security: Certificates and SSL/TLS
CSE 484 / CSE M 584: Computer Security and Privacy Crypto meets Web Security: Certificates and SSL/TLS Spring 2016 Franziska (Franzi) Roesner franzi@cs.washington.edu Thanks to Dan Boneh, Dieter Gollmann,
Cryptography SSL/TLS. Network Security Workshop. 3-5 October 2017 Port Moresby, Papua New Guinea
Cryptography SSL/TLS Network Security Workshop 3-5 October 2017 Port Moresby, Papua New Guinea 1 History Secure Sockets Layer was developed by Netscape in 1994 as a protocol which permitted persistent
Session key establishment protocols
our task is to program a computer which gives answers which are subtly and maliciously wrong at the most inconvenient possible moment. -- Ross Anderson and Roger Needham, Programming Satan s computer Session
1 Identification protocols
ISA 562: Information Security, Theory and Practice Lecture 4 1 Identification protocols Now that we know how to authenticate messages using MACs, a natural question is, how can we use MACs to prove that
CS 470 Spring Security. Mike Lam, Professor. a.k.a. Why on earth do Alice and Bob need to share so many secrets?!?
50fb6be35f4c3105 9d4ed08fb86d8887 b746c452a9c9443b 15b22f450c76218e CS 470 Spring 2018 9df7031cdbff9d10 b700a92855f16328 5b757e66d2131841 62fedd7d9131e42e Mike Lam, Professor Security a.k.a. Why on earth
Session key establishment protocols
our task is to program a computer which gives answers which are subtly and maliciously wrong at the most inconvenient possible moment. -- Ross Anderson and Roger Needham, Programming Satan s computer Session
CS 470 Spring Security. Mike Lam, Professor. a.k.a. Why on earth do Alice and Bob need to talk so much?!? Content taken from the following:
50fb6be35f4c3105 9d4ed08fb86d8887 b746c452a9c9443b 15b22f450c76218e CS 470 Spring 2017 9df7031cdbff9d10 b700a92855f16328 5b757e66d2131841 62fedd7d9131e42e Mike Lam, Professor Security a.k.a. Why on earth
Lecture 15 PKI & Authenticated Key Exchange. COSC-260 Codes and Ciphers Adam O Neill Adapted from
Lecture 15 PKI & Authenticated Key Exchange COSC-260 Codes and Ciphers Adam O Neill Adapted from http://cseweb.ucsd.edu/~mihir/cse107/ Today We will see how signatures are used to create public-key infrastructures
Lecture 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
Elements of Cryptography and Computer and Network Security Computer Science 134 (COMPSCI 134) Fall 2016 Instructor: Karim ElDefrawy
Elements of Cryptography and Computer and Network Security Computer Science 134 (COMPSCI 134) Fall 2016 Instructor: Karim ElDefrawy Homework 3 Due: Monday, 11/28/2016 at 11:55pm PT Solution: Will be posted
CS 161 Computer Security
Popa & Wagner Spring 2016 CS 161 Computer Security Midterm 2 Print your name:, (last) (first) I am aware of the Berkeley Campus Code of Student Conduct and acknowledge that academic misconduct will be
Key Management CS461/ECE422
Key Management CS461/ECE422 1 Reading Chapter 10 in Computer Security: Art and Science Handbook of Applied Cryptography http://www.cacr.math.uwaterloo.ca/hac/ Section 11.3.2 attack on RSA signature Section
CIS 6930/4930 Computer and Network Security. Final exam review
CIS 6930/4930 Computer and Network Security Final exam review About the Test This is an open book and open note exam. You are allowed to read your textbook and notes during the exam; You may bring your
CS3235 Seventh set of lecture slides
CS3235 Seventh set of lecture slides Hugh Anderson National University of Singapore School of Computing October, 2007 Hugh Anderson CS3235 Seventh set of lecture slides 1 Warp 9... Outline 1 Public Key
Chapter 10 : Private-Key Management and the Public-Key Revolution
COMP547 Claude Crépeau INTRODUCTION TO MODERN CRYPTOGRAPHY _ Second Edition _ Jonathan Katz Yehuda Lindell Chapter 10 : Private-Key Management and the Public-Key Revolution 1 Chapter 10 Private-Key Management
CS 161 Computer Security
Raluca Ada Popa Spring 2018 CS 161 Computer Security Discussion 6 Week of February 26, 2018 Question 1 TLS threats (10 min) An attacker is trying to attack the company Boogle and its users. Assume that
Computer Security 3e. Dieter Gollmann. Chapter 15: 1
Computer Security 3e Dieter Gollmann www.wiley.com/college/gollmann Chapter 15: 1 Chapter 15: Key Establishment Chapter 15: 2 Introduction Crypto transforms (communications) security problems into key
INF3510 Information Security University of Oslo Spring Lecture 3 Key Management and PKI. Audun Jøsang
INF3510 Information Security University of Oslo Spring 2010 Lecture 3 Key Management and PKI Audun Jøsang Outline Key management Key establishment Public key infrastructure Digital certificates PKI trust
Cryptographic 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
CSC 774 Network Security
CSC 774 Network Security Topic 2. Review of Cryptographic Techniques CSC 774 Dr. Peng Ning 1 Outline Encryption/Decryption Digital signatures Hash functions Pseudo random functions Key exchange/agreement/distribution
Overview. SSL Cryptography Overview CHAPTER 1
CHAPTER 1 Secure Sockets Layer (SSL) is an application-level protocol that provides encryption technology for the Internet. SSL ensures the secure transmission of data between a client and a server through
(2½ hours) Total Marks: 75
(2½ hours) Total Marks: 75 N. B.: (1) All questions are compulsory. (2) Makesuitable assumptions wherever necessary and state the assumptions made. (3) Answers to the same question must be written together.
Module: 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
Version 3 X.509 Certificates
Entrust Technologies White Paper Author: Ian Curry Date: July 1996 Version: 1.0 Entrust Technologies, 1997. All rights reserved. 1 1. Introduction This document provides a description of the version 3
Lecture 9a: Secure Sockets Layer (SSL) March, 2004
Internet and Intranet Protocols and Applications Lecture 9a: Secure Sockets Layer (SSL) March, 2004 Arthur Goldberg Computer Science Department New York University artg@cs.nyu.edu Security Achieved by
Network Security Chapter 8
Network Security Chapter 8 Cryptography Symmetric-Key Algorithms Public-Key Algorithms Digital Signatures Management of Public Keys Communication Security Authentication Protocols Email Security Web Security
Module: Authentication. Professor Trent Jaeger. CSE543 - Introduction to Computer and Network Security
CSE543 - Introduction to Computer and Network Security Module: Authentication Professor Trent Jaeger CSE543 - Introduction to Computer and Network Security 1 Kerberos History: from UNIX to Networks (late
WAP Security. Helsinki University of Technology S Security of Communication Protocols
WAP Security Helsinki University of Technology S-38.153 Security of Communication Protocols Mikko.Kerava@iki.fi 15.4.2003 Contents 1. Introduction to WAP 2. Wireless Transport Layer Security 3. Other WAP