ECE-8843 Fall 2004 Prof. John A. Copeland [email protected] 404 894-5177 fax 404...

23
ECE-8843 Fall 2004 http://www.csc.gatech.edu/copeland/jac/8843/ Prof. John A. Copeland [email protected] 404 894-5177 fax 404 894-0035 Office: GCATT Bldg 579 r call for office visit, or call Kathy Cheek, 404 8

TAGS:

Transcript of ECE-8843 Fall 2004 Prof. John A. Copeland [email protected] 404 894-5177 fax 404...

Page 1: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

ECE-8843 Fall 2004http://www.csc.gatech.edu/copeland/jac/8843/

Prof. John A. [email protected]

404 894-5177fax 404 894-0035

Office: GCATT Bldg 579email or call for office visit, or call Kathy Cheek, 404 894-5696

Page 2: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

The class Web site is: http://www.csc.gatech.edu/copeland/jac/8843/or http://users.ece.gatech.edu/~copeland/jac/8843/

On this site you will find:• Class calendar (test dates, etc.)• Reading assignments (about 20 pages, read before class)• Lecture Notes (ppt files to print)• Homework assignments (and answers), a Q&A folder

Homework assignments will be text files, sent to you by email and posted on the Web. Answers will be edited into them, and they will be returned by email to me.

Since these count for your final grade, treat homework assignments like take-home quizzes. Graded versions will be returned to you by email.

2

Page 3: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

• Privacy - not readable• Permanent - not alterable (can't edit, delete)• Reliable - (changes detectable)• Signed - (non-reputable)• Acknowledged - (know it was received)

But the data must be accessible to persons authorized to:

• Read, edit, add, delete

Probably over a network, possibly over the Internet.

Objectives of Data Security(relative to unauthorized persons)

3

Page 4: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

* Security Attack: Any action that compromises the security of information.

* Security Mechanism: A mechanism that is designed to detect, prevent, or recover from a security attack.

* Security Service: A service that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms.

Attacks, Services, and Mechanisms

4

Page 5: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

Security Services

* Confidentiality (privacy)

* Authentication (who created or sent the data)

* Integrity (has not been altered)

* Non-repudiation (the order is final)

* Access control (prevent misuse of resources)

* Availability (permanence, non-erasure)

- Denial of Service Attacks

- Virus that deletes files

5

Page 6: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

66

Page 7: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

7

Page 8: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

Wiring Closet

8

Page 9: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

Wiring Trough

9

Page 10: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

10

Page 11: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

11

Page 12: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

Security StandardsInternet - Internet Engineering Task Force (IETF)

De Facto (PGP email security system, Kerberos-MIT)

ITU (X.509 Certificates)

- not in book -

National Institute of Standards and Technology (SHA)

IEEE

Department of Defense, Nat. Computer Security Center

- Tempest (radiation limits)

- Orange Book: Class A1, B3, C1, C2, ...

Export Controls

- High Performance Computers

- Systems with “Hard” Encryption

12

Page 13: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

13

Page 14: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

Virus - code that copies itself into other programs (usually riding on email messages or attached documents (e.g., macro viruses).

Payload - harmful things it does, after it has had time to spread.

Worm - a program that replicates itself across the network (Sapphire: single UDP packet, MSblast: TCP opened a back-door)

Trojan Horse - instructions in an otherwise good program that cause bad things to happen (sending your data or password to an attacker over the net).

Logic Bomb - malicious code that activates on an event (e.g., date).

Trap Door (or Back Door) - undocumented entry point written into code for debugging that can allow unwanted users.

Viruses, Worms, and Trojan Horses

14

Page 15: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

Have a well-known virus protection program, configured to scan disks and downloads automatically for known viruses.

Do not execute programs (or "macro's") from unknown sources (e.g., PS files, HyperCard files, MS Office documents, Java, ...), if you can help it.

Avoid the most common operating systems and email programs, if possible.

Virus Protection

15

Page 16: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

16

Password Gathering

Look under keyboard, telephone etc.

Look in the Rolodex under “X” and “Z”

Call up pretending to from “micro-support,” and ask for it.

“Snoop” a network and watch the plaintext passwords go by.

Tap a phone line - but this requires a very special modem.

Use a “Trojan Horse” program or “key catcher”to record key stokes.

Page 17: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

17

The Stages of a Network Intrusion

1. Scan the network to:• locate which IP addresses are in use, • what operating system is in use, • what TCP or UDP ports are “open” (being listened to by Servers).

2. Run “Exploit” scripts against open ports3. Get access to Shell program which is “suid” (has “root” privileges).4. Download from Hacker Web site special versions of systems files that will let Cracker have free access in the future without his cpu time or disk storage space being noticed by auditing programs.5. Use IRC (Internet Relay Chat) to invite friends to the feast.

Page 18: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

18

Application Layer (HTTP)

Transport Layer(TCP,UDP)

Network Layer (IP)

E'net DataLink Layer

Ethernet

Phys. Layer

Network Layer

E'net DataLink Layer

E'net Phys.Layer

Network Layer

Web Server Browser

Router-Firewallcan drop packets

based onsource or destination,ip address and/or port

Application Layer (HTTP)

Transport Layer(TCP,UDP)

Network Layer (IP)

Token Ring

Data-Link Layer

Token RingPhys. Layer

IP Address130.207.22.5

IP Address24.88.15.22

Port 80 Port 31337

Segment No. Segment No.

Token Ring

Data Link Layer

Token RingPhys. Layer

Page 19: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

IP Zone-Access Control

/etc/hosts.deny

ALL:ALL

/etc/hosts.allow

in.telnetd: 199.77.146 24.88.154.17

in.ftpd: 199.77.146.19 199.77.146.102

UNIX and Linux computers allow network contact to be limited to individual hosts or subnets (199.77.146 means 199.77.146.any).

Above, telnet connection is available to all on the 199.77.146.0 subnet, and a single off-subnet host, 24.88.154.17 FTP service is available to only to two local hosts, .19 and .102.

The format for each line is “daemon:host-list”19

Page 20: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

IP Zone-Access Control

/etc/hosts.deny

ALL:ALL

/etc/hosts.allow

in.telnetd: 199.77.146 24.88.154.17

in.ftpd: 199.77.146.19 199.77.146.102

UNIX and Linux computers allow network contact to be limited to individual hosts or subnets (199.77.146 means 199.77.146.any).

Above, telnet connection is available to all on the 199.77.146.0 subnet, and a single off-subnet host, 24.88.154.17 FTP service is available to only to two local hosts, .19 and .102.

The format for each line is “daemon:host-list”20

Page 21: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

From "PGP Freeware for MacOS, User's Guide" Version 6.5, Network Associates, Inc., www.pgp.com

21

PGP (Pretty Good Privacy) -> GPG

Page 22: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

22

Access Control

Today almost all systems are protected only by a simple password that is typed in, or sent over a network in the clear.Techniques for guessing passwords:

1. Try default passwords.2. Try all short words, 1 to 3 characters long.3. Try all the words in an electronic dictionary(60,000).4. Collect information about the user’s hobbies, family names, birthday, etc.5. Try user’s phone number, social security number, street address, etc.6. Try all license plate numbers (123XYZ).

Prevention: Enforce good password selection (c0p31an6)

Page 23: ECE-8843 Fall 2004 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office:

23

Kerberos


Georgia Tech - Center For Teaching & Learning · School of Mathematics Atlanta, GA 30332-0160 U.S.A. PHONE 404 894 9202 FAX 404 894 1832 1 February 2, 2015 CETL/BP Junior Faculty

Georgia Tech - Center For Teaching & Learning · School of Mathematics Atlanta, GA 30332-0160 U.S.A. PHONE 404 894 9202 FAX 404 894 1832 1 February 2, 2015 CETL/BP Junior Faculty

111111 1111111111 M I 11 IIII IIIII 0 - dtic.mil · "" 111111 1111111111 M I 11 IIII 1i1U IIIII ... Telephone: (404) 894-8228 ... "real world testing" was encouraged to field test

111111 1111111111 M I 11 IIII IIIII 0 - dtic.mil · "" 111111 1111111111 M I 11 IIII 1i1U IIIII ... Telephone: (404) 894-8228 ... "real world testing" was encouraged to field test

Closed-Form Approximations for Spread Option Prices and ...Phone: 404-894-4926. Fax: 404-894-6030. Fax: 404-894-6030. ‡ 755 Ferst Drive NW, School of Industrial and Systems Engineering,

Closed-Form Approximations for Spread Option Prices and ...Phone: 404-894-4926. Fax: 404-894-6030. Fax: 404-894-6030. ‡ 755 Ferst Drive NW, School of Industrial and Systems Engineering,

ECE-8843 Prof. John A. Copeland 404 894-5177 fax 404 894-0035 Office: GCATT Bldg.

ECE-8843 Prof. John A. Copeland 404 894-5177 fax 404 894-0035 Office: GCATT Bldg.

CATALOG USI METALICE · 2019. 5. 31. · USI METALICE REZISTENTE LA EXTERIOR. Relatii la tel: 0743 894 404. EKaPlast PROFILE . EKaPlast PROFILE EKaPlast PROFILE . Created Date: 12/4/2018

CATALOG USI METALICE · 2019. 5. 31. · USI METALICE REZISTENTE LA EXTERIOR. Relatii la tel: 0743 894 404. EKaPlast PROFILE . EKaPlast PROFILE EKaPlast PROFILE . Created Date: 12/4/2018

THESIS AND DISSERTATION MANUALgradadmiss.gatech.edu/sites/default/files/ThesisManual...2003/11/11  · 631 Cherry Street Savant Building, Suite 318 Atlanta, GA 30332-0215 404-894-3092

THESIS AND DISSERTATION MANUALgradadmiss.gatech.edu/sites/default/files/ThesisManual...2003/11/11  · 631 Cherry Street Savant Building, Suite 318 Atlanta, GA 30332-0215 404-894-3092

The Cost of Doing Business Abroad and International ... · Ferst Drive, Atlanta, Georgia 30332-0520, 404/894-5109, 404/894-6030 (fax), milind.shrikhande@mgt.gatech.edu. Questions

The Cost of Doing Business Abroad and International ... · Ferst Drive, Atlanta, Georgia 30332-0520, 404/894-5109, 404/894-6030 (fax), [email protected]. Questions

EAS 4300/6124: Introduction to Oceanography, FALL 2006 INSTRUCTOR: Emanuele Di Lorenzo phone 404-894-3994 office ES&T 3244 email edl@eas.gatech.edu Ellery.

EAS 4300/6124: Introduction to Oceanography, FALL 2006 INSTRUCTOR: Emanuele Di Lorenzo phone 404-894-3994 office ES&T 3244 email [email protected] Ellery.

OMED Educational Services 681 Cherry St. NW Atlanta, Ga. 30332-0600 Phone (404) 894-3959 Fax (404) 894-1608 What is OMED? MISSION STATEMENT.

OMED Educational Services 681 Cherry St. NW Atlanta, Ga. 30332-0600 Phone (404) 894-3959 Fax (404) 894-1608 What is OMED? MISSION STATEMENT.

ECE-6612 Prof. John A. Copeland 404 894-5177 fax 404 894-0035 Office: Klaus 3362.

ECE-6612 Prof. John A. Copeland 404 894-5177 fax 404 894-0035 Office: Klaus 3362.

Gooya issue 894

Gooya issue 894

ECE-8843 Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office: GCATT.

ECE-8843 Prof. John A. Copeland [email protected] 404 894-5177 fax 404 894-0035 Office: GCATT.

So you want to be an aerospace engineer.. Lakshmi Sankar lsankar@ae.gatech.edu 404-894-3014 Daurette Joseph daurette.joseph@ae.gatech.edu 404-385-1595.

So you want to be an aerospace engineer.. Lakshmi Sankar [email protected] 404-894-3014 Daurette Joseph [email protected] 404-385-1595.

Advanced Mechatronics, Georgia Tech ME8843 ME 6408: ADVANCED MECHATRONICS Instructor: Prof. I. Charles Ume Phone: 404-894-7411 Office: MARC Building, Room.

Advanced Mechatronics, Georgia Tech ME8843 ME 6408: ADVANCED MECHATRONICS Instructor: Prof. I. Charles Ume Phone: 404-894-7411 Office: MARC Building, Room.

894 black spanners - · PDF fileT Acc. to DIN 894, ISO 3318 ... 6577430 894 65 65 528 18.7 132.0 1686 1 2315173 894 67 * (*) 67 528 19.0 132.0 1800 1 6577510 894 70 70 572 19.7 142.0

894 black spanners - · PDF fileT Acc. to DIN 894, ISO 3318 ... 6577430 894 65 65 528 18.7 132.0 1686 1 2315173 894 67 * (*) 67 528 19.0 132.0 1800 1 6577510 894 70 70 572 19.7 142.0

1 Nanotechnology Stuff… The College of Computing Georgia Institute of Technology What I do. Mike Niemier (a.k.a. Mike) mniemier@cc.gatech.edu Phone: 404-894-1704.

1 Nanotechnology Stuff… The College of Computing Georgia Institute of Technology What I do. Mike Niemier (a.k.a. Mike) [email protected] Phone: 404-894-1704.

ECE-8843 copeland/jac/8843-03/ Prof. John A. Copeland john.copeland@ece.gatech.edu 404 894-5177 fax 404 894-0035 Office: GCATT.

ECE-8843 copeland/jac/8843-03/ Prof. John A. Copeland [email protected] 404 894-5177 fax 404 894-0035 Office: GCATT.

2011 Late Short Summer Session studies in a more intimate ...admission.gatech.edu/images/pdf/Summer_Session... · Buzz Card Center 404-894-2899 Campus Police 404-894-2500 therefore,

2011 Late Short Summer Session studies in a more intimate ...admission.gatech.edu/images/pdf/Summer_Session... · Buzz Card Center 404-894-2899 Campus Police 404-894-2500 therefore,

Wireless Independence Now - AT&T · ‒Ben@imtc.gatech.edu ‒404-894-7034 Thank You! 28. Title: PowerPoint Presentation Author: Ben Lippincott Created Date: 6/20/2016 3:13:30 PM

Wireless Independence Now - AT&T · ‒[email protected] ‒404-894-7034 Thank You! 28. Title: PowerPoint Presentation Author: Ben Lippincott Created Date: 6/20/2016 3:13:30 PM

1 EAS 4300: Introduction to Oceanography, FALL 2009 INSTRUCTORS: Emanuele Di Lorenzo phone 404-894-3994 office ES&T 3244 email edl@eas.gatech.edu Kim Cobb.

1 EAS 4300: Introduction to Oceanography, FALL 2009 INSTRUCTORS: Emanuele Di Lorenzo phone 404-894-3994 office ES&T 3244 email [email protected] Kim Cobb.