7.6 Secure E-mail Network Security / G.Steffen1. In This Section Threats to E-mail E-mail Protection List Overview of Encrypted E-mail Processing Example.

Slides:

Advertisements

Similar presentations

Public Key Infrastructure and Applications

Advertisements

Cryptography Chapter 7 Part 4 Pages 833 to 874. PKI Public Key Infrastructure Framework for Public Key Cryptography and for Secret key exchange.

Information Security & Cryptographic Principles. Infosec and Cryptography Subjects / Topics : 1. Introduction to computer cryptography 1. Introduction.

Lecture 5: security: PGP Anish Arora CSE 5473 Introduction to Network Security.

Lecture 5: security: PGP Anish Arora CIS694K Introduction to Network Security.

Cryptography and Network Security Third Edition by William Stallings Lecture slides by Lawrie Brown.

Security Overview Hofstra University University College for Continuing Education - Advanced Java Programming Lecturer: Engin Yalt May 24, 2006.

TCP/IP Protocol Suite 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 30 Internet Security.

1 Pertemuan 12 Security Matakuliah: H0242 / Keamanan Jaringan Tahun: 2006 Versi: 1.

NS-H / Security. NS-H / Security is one of the most widely used and regarded network services currently message.

Electronic mail security -- Pretty Good Privacy.

Cryptography and Network Security Chapter 15 Fourth Edition by William Stallings Lecture slides by Lawrie Brown.

Security Jonathan Calazan December 12, 2005.

Electronic Mail Security. Authentication and confidentiality problems Two systems: - PGP (Pretty Good Privacy) - S/MIME (Science Multipurpose Internet.

Security using Encryption Security Features Message Origin Authentication - verifying that the sender is who he or she says they are Content Integrity.

Lecture 9: Security via PGP CS 436/636/736 Spring 2012 Nitesh Saxena.

SMUCSE 5349/49 Security. SMUCSE 5349/7349 Threats Threats to the security of itself –Loss of confidentiality s are sent in clear over.

Electronic Mail Security

Chapter 14 Encryption: A Matter Of Trust. Awad –Electronic Commerce 2/e © 2004 Pearson Prentice Hall 2 OBJECTIVES What is Encryption? Basic Cryptographic.

Secure r How do you do it? m Need to worry about sniffing, modifying, end- user masquerading, replaying. m If sender and receiver have shared secret.

Wireless and Security CSCI 5857: Encoding and Encryption.

16.1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 16 Security at the Application Layer: PGP and.

1 TCP/IP Applications. 2 NNTP: Network News Transport Protocol NNTP is a TCP/IP protocol based upon text strings sent bidirectionally over 7 bit ASCII.

Electronic mail security. Outline Pretty good privacy S/MIME.

Security.  is one of the most widely used and regarded network services  currently message contents are not secure may be inspected either.

Securing Electronic Transactions University of Palestine Eng. Wisam Zaqoot April 2010 ITSS 4201 Internet Insurance and Information Hiding.

Cryptography, Authentication and Digital Signatures

Network Security Essentials Chapter 7 Fourth Edition by William Stallings (Based on Lecture slides by Lawrie Brown)

Chapter 6 Electronic Mail Security MSc. NGUYEN CAO DAT Dr. TRAN VAN HOAI 1.

Códigos y Criptografía Francisco Rodríguez Henríquez Security Attacks: Active and Passive Active Masquerade (impersonation) Replay Modification of message.

Key Management. Session and Interchange Keys  Key management – distribution of cryptographic keys, mechanisms used to bind an identity to a key, and.

Cryptography and Network Security (CS435) Part Twelve (Electronic Mail Security)

Internet Security. Four Issues of Internet Security Authenticity: Is the sender of a message who they claim to be? Privacy: Are the contents of a message.

Chapter 15: Electronic Mail Security

1 Information Security Practice I Lab 5. 2 Cryptography and security Cryptography is the science of using mathematics to encrypt and decrypt data.

Pretty Good Privacy (PGP) Security for Electronic .

CSCE 815 Network Security Lecture 11 Security PGP February 25, 2003.

NETWORK SECURITY.

Security PGP IT352 | Network Security |Najwa AlGhamdi 1.

X.509 Topics PGP S/MIME Kerberos. Directory Authentication Framework X.509 is part of the ISO X.500 directory standard. used by S/MIME, SSL, IPSec, and.

CSCE 201 Security Fall CSCE Farkas2 Electronic Mail Most heavily used network-based application – Over 210 billion per day Used across.

Security Using PGP - Prajakta Bahekar. Importance of Security is one of the most widely used network service on Computer Currently .

INFORMATION SECURITY MANAGEMENT P ROTECTION M ECHANISMS - C RYPTOGRAPHY.

Secure  Message interception (confidentiality)  Message interception (blocked delivery)  Message interception and subsequent replay  Message.

1 Electronic Mail Security Behzad Akbari Fall 2009 In the Name of the Most High.

Electronic Mail Security Prepared by Dr. Lamiaa Elshenawy

2/19/2016clicktechsolution.com Security. 2/19/2016clicktechsolution.com Threats Threats to the security of itself –Loss of confidentiality.

Security  is one of the most widely used and regarded network services  currently message contents are not secure may be inspected either.

Copyright 2004 MayneStay Consulting Group Ltd. - All Rights Reserved Jan-041 Security using Encryption Security Features Message Origin Authentication.

INFORMATION SECURITY MANAGEMENT P ROTECTION M ECHANISMS - C RYPTOGRAPHY.

By Marwan Al-Namari & Hafezah Ben Othman Author: William Stallings College of Computer Science at Al-Qunfudah Umm Al-Qura University, KSA, Makkah 1.

Security By Meenal Mandalia. What is ? stands for Electronic Mail. much the same as a letter, only that it is exchanged in a different.

Chapter 7 : Web Security Lecture #1-Week 12 Dr.Khalid Dr. Mohannad Information Security CIT 460 Information Security Dr.Khalid Dr. Mohannad 1.

Department of Computer Science Chapter 5 Introduction to Cryptography Semester 1.

Prof. Wenguo Wang Network Information Security Prof. Wenguo Wang Tel College of Computer Science QUFU NORMAL UNIVERSITY.

1 CNLab/University of Ulsan Chapter 16 Electronic Mail Security  PGP (Pretty Good Privacy)  S/MIME.

Lecture 8 (Chapter 18) Electronic Mail Security Prepared by Dr. Lamiaa M. Elshenawy 1.

第五章电子邮件安全. Security is one of the most widely used and regarded network services currently message contents are not secure –may be inspected.

Security Depart. of Computer Science and Engineering 刘胜利 ( Liu Shengli) Tel:

Chapter 5a - Pretty Good Privacy (PGP)

Security is one of the most widely used and regarded network services

CS 465 Secure Last Updated: Nov 30, 2017.

Security at the Application Layer: PGP and S/MIME

Security in Network Communications

ELECTRONIC MAIL SECURITY

ELECTRONIC MAIL SECURITY

Secure How do you do it? Need to worry about sniffing, modifying, end-user masquerading, replaying. If sender and receiver have shared secret keys,

Electronic Mail Security

Cryptography and Network Security

Presentation transcript:

7.6 Secure Network Security / G.Steffen1

In This Section Threats to Protection List Overview of Encrypted Processing Example Secure Systems 2 Network Security / G.Steffen2

Threats to Message interception (confidentiality) Message interception (blocked delivery) Message interception & subsequent replay Message content modification Message origin modification Message content forgery by outsider Message origin forgery by outsider Message content forgery by recipient Message origin forgery by recipient 3Network Security / G.Steffen

Protection List Message confidentiality The message is not exposed en route to the receiver Message integrity What the receiver sees is what was sent Sender authenticity The receiver is confident who the receiver was Nonrepudiation The sender cannot deny having sent the message Network Security / G.Steffen4

Overview of Encrypted Processing Network Security / G.Steffen5 The encrypted standard supports multiple encryption algorithm. Encrypted messages always carry a digital signature. Encrypted processing can integrate with ordinary e- mail packages The major problem with encrypted is key management Message Integrity Check (MIC) – A hash function in the digital signature

Encrypted –Secured Message Network Security / G.Steffen6

Example Secure Systems 1 Pretty Good Privacy (PGP) Invented by Phil Zimmerman in 1991 It is heavily used by individuals exchanging private It addresses the key distribution problem with what is called “ring of trust” or a users “keyring” It does not mandate a policy for establishing trust Some of it actions include: Creating a random session key for a symmetric algorithm Encrypting the message Encrypting the session key under the recipients public key Transmit the message to the recipient Network Security / G.Steffen7

Example Secure Systems 2 Secure Multipurpose Internet Mail Extensions (S/MIME) It is the internet standard for secure attachments. It uses hierarchically validated certificates for key exchange. It works with a variety of cryptographic algorithms such as DES, AES & RC2 fir symmetric encryption. Network Security / G.Steffen8