SECURITY Bart Vansevenant  Who is who?  Who can read what?  Traces  Virusses  Safety and confidentiality.

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Presentation transcript:

SECURITY Bart Vansevenant  Who is who?  Who can read what?  Traces  Virusses  Safety and confidentiality

Who is who?

Telephone line Mail server TCP/IP Echelon & Carnivore Who can read what ?

SMTP POP3 POST MAIL using an ISP POST OFFICE

SMTP POP3 POST MAIL a) Telephone-line POST OFFICE

SMTP POP3 POST MAIL b) server Everything on the servers can be read or copied POST OFFICE

SMTP POP3 POST MAIL c) TCP/IP Not readable – following different ways POST OFFICE

Echelon/Carnivore Source:

Traces

Traces The IP address of your computer is : your DNS address is : adsl wanadoo.be We know you use : Microsoft Windows 98 Your navigator has the code: Mozilla/4.78 [en] (Win98; U) In fact it is: Netscape Communicator 4.x English What you did is stored : Windows 95 C:\Windows\Temporary Internet Files\ Windows NT C:\WinNt\Temporary Internet Files\ A nice demo in french on:

Virus What is a virus and types? How is a computer infected? Danger

a) What is a virus?  computer virus = a computer program 'I love you', 45 million computers infected  worm = multiplicates itself c ode Red: servers destroyed  trojan horse = hides for other actions Back Orifice  logic bomb = distroys programs  hoax = false alarm

b) How is a computer infected?  files attached to (attachment)  diskettes  other

c) Danger  infecting components of your system  effects:  malfunctions  deletion of data  wiping of hard disk ...

Solutions to provide safety and confidentiality solving identity problem and unauthorised reading protection against traces protection against virusses

Encryption  Purpose  Functions  How? Identity and unauthorised reading

Functions of encryption Authentication Integrity Confidentiality

Symmetrical encryption UbizenVcjafo Encryption E(…) Decryption D(…) SenderReceiver Vcjafo Untrusted network SAME KEY Ubizen A=A+ 1 A=A- 1

Asymmetrical encryption Ubizen SenderReceiver Untrusted network Go#st$ Encryption E(…) Public Key Receiver Decryption D(…) Go#st$Ubizen Private Key Receiver confidentiality towards receiver

Asymmetrical encryption Ubizen SenderReceiver Untrusted network Go#st$ Encryption E(…) Private Key Sender Decryption D(…) Go#st$Ubizen Public Key Sender authentication of sender

Example

Example

Example

 Traces at the ISP  Traces on own computer Against leaving traces

 anti-virus program N orton, McAfee, eSafe, F-Secure, …  watch out for attachments.exe,.com,.pif,.vbs,.doc,.xls, …  Against virusses