Internet and Image Processing

1

• Internet and Image Processing
• Locarno
• Zeno Geradts / Netherlands Forensic Institute

2
Overview

• Email, Newsgroup, Chatprograms
• Secure Browsing
• Forensic Databases on the internet
• Image Databases
• Future expectations

3
Email programs

• Netscape messenger
• Outlook (Express)
• Eudora and many others (over 400)
• Web interfaces, hotmail, yahoo and many others

4
Settings

• Mailserver for outgoing mail
• Pop-server for incoming mail with user name and
  password
• Institute network - exchange server

5
Email fields
6
Tracing email

• Header-information

7
Mail servers

• Mail server by sending email subscribe FORS ,
  example
• subscribe MajorDomo_at_statgen.ncsu.edu
• often email messages are sent back with question
  for verification
• also information of users in database can be
  retrieved

8
Security

• Passwords and information in plain text to
  mailservers - some have encryption option
• PGP should be used for privacy
• Private Key (kept on separate floppy)
• Public Key (sent to everyone)
• Integrated in Outlook and Eudora
• US version / International version
• Also encryption possible with other packages
  (included in Outlook)

9
Identifying the person

• Regular emails can be falsified
• Certificates of Authentity might help
• In PGP people will certify each other
• Verisign, notaries and other instances will make
  a certificate of authentity

10
PGP
11
Example

• -----BEGIN PGP MESSAGE-----
• Version PGPfreeware 6.5.1 Int. for
  non-commercial use lthttp//www.pgpinternational.co
  mgt
• hQEMA9df7fVjQu4XAQgAmi/17jrXf9bcVBZPBT9IDfoCPLnz0V
  dmXXhFT0OziL0X
• W8JRAwPr9STGipsdOQyzQz2qkLjKuMHatE0FsnTR54DfTdv1l
  q2QbgZzTldmvoy
• NNMkxi9BTROzPGtM6Fp4kAt73DuCilXCirBr/7cEjEtdXYGY2L
  ZAEa8arSxN9Km0
• 7N9xTDWZ2wdxw/b8RXvINk/3O3JMgx5l7sG7I6LB3nwLG6Gelu
  7t9oEUi8xojW9S
• s2SP1kAwYVMqxkbqizW3K5iBt2YPtisI3mASK7WpMjA0pkP
  u4Qdl7F5QAVV6C
• edK3COBPDrLYBZ5jLQLrZm4j9LHG3UcqJyg4unBR3qQvvfNcn
  Av1HiwXZk0ZLdY
• y6ZXivHwc5IApNX6EI2izo4QkeFATXzz75B9kMEwPIU
• W79d
• -----END PGP MESSAGE-----
• decoded
• This is a secret message.

12
Spam prevention

• Keep a separate email address for mails to
  newsgroups and other public mailings
• Do not reply to spam
• Use spam filters

13
Attachments

• Keep aware of attachments virus scanner
• attach anything word documents, sounds, movies,
  images, programs
• Often a limit for the file size applies

14
Discussion lists

• Convenient communication
• Netiquette
• administrative requests to the right email
  address
• read the FAQ of the list before submitting
  informationpost appropiate messages
• Be careful with reply-feature since all personal
  answers will be mailed to the complete list

15
Also discussion lists on the web
16
Newsgroups

• Over 40.000 newsgroups and many more local
• Alt AlternativeComp Computer relatedMisc Everyt
  hing elseNews Usenet administrationRec Recreatio
  nal topicsSci Science and TechnologySoc Soci
  al Chatter, sociologyTalk Misc. Politics and
  rhetoric

17
News-software

• Outlook (Express)
• Netscape Messenger
• Many others (over 70), as Free Agent
• Web interface deja.com

18
Settings software

• Your ISP should have a newsgroup server
• name of server in field
• select the newsgroups you would like to view
• Also images/videos and sounds can be attached

19
Newsgroups

• Read on line / offline
• Deja offers a good service to search in all
  newsgroups
• Easy for problem solving
• questions in newsgroups will often result in
  answers
• Moderated newsgroups also exist

20
Newsgroups
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Example Deja.com
22
Chatprograms

• IRC (internet relayed chat)
• Often with commercial providers (AOL)
• ICQ
• Microsoft Netmeeting (also live Video and audio)
• Cuseeme

23
ICQ

• Download at http//www.icq.com
• Or use web interface
• Users can see if you are on line
• Privacy protection is included
• If you know the address eg ICQ 43490217 you can
  chat or search for the name

24
Example of ICQ-screen
25
Netmeeting

• Video and audio
• Integration of desktop
• High Speed line is convenient

26
Netmeeting Example
27
Integration

• Trend
• These products all integrate
• Security is a problem
• Denial of service attacks are also occurring more
  frequently

28

• Workshop AAFS, Reno NV
• Forensic Databases on the internet
• Zeno Geradts
• Netherlands Forensic Institute

29
Outline

• Literature databasescommercial databases (paid
  service)free services
• Databases of images and patterns
• Contents Based Search
• Expectations

30
Commercial Services

• Oldest databases of literature (for 25 years)
• STN
• Dialog
• DataStar
• Lexis / Nexis
• ESA

31
Commercial Databases

• STN
• Chemical abstracts
• Medline
• Physics Inspec / Compendex
• Science Citation Index
• Web Interface for simple and complex use

32
STN
33
STN Easy
34
STN search simple
35
STN search results
36
Results
37
Single Records
38
Dialog / DataStar

• Search in Dialog / DataStar also via Web
  interface
• NCJRS / Criminal Justice Index on line
• Many newspapers
• Finding information on products
• Database FORS of the Forensic Science Service
  used to be on line at DataStar

39
FORS

• Forensic Literature database with over 50000
  records
• Only available on CD-ROM
• Example with index at http//geradts.tzo.com/searc
  h/search.cgi

40
FORS
41
FORS with Silverplatter Disk w Medline
42
Lexis/Nexis

• Paid service for law enforcement information
• Software has to be installed at PC

43
Free Services

• Literature articles Uncover
• Books amazon.com
• Libraries of University On Line Contents
• Library of Congress
• Electric Library
• Patent Information
• Medline
• ASQDE

44
Uncover
45
Amazon
46
Libraries
47
Library of Congress
48
Patent Servers
49
Databases of forensic links

• Reddys Forensic Site
• Zenos Forensic Site
• ASQDE site
• Short Tandem Repeat DNA Database
• Many different search engines
• www.northernlight.com

50
Medline
51
Image Databases
52
Image Databases (2)
53
Future Expectations

• More bandwith Video searches are available
• Literature databases will completely integrate in
  each other
• Document order directly for much literature by
  PDF-files
• For use in court the data has to be verified.
  Verification algorithms are needed in databases.