topic 8 section 3
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4 types of security
- seals of assurance
transforms messages into an unreadable format until themessage is decoded.
encryption methods can use either a
single key (known to both the sender and the receiver of the message) ora dual key method
single key method
involves a password. sender encrypts the message using a password and then sends the message to the receiver (who needs to know password in order to get software to decode message)
duel key method (i.e. public key encryption)
doesn't require a password to be sent to the receiver of the message. instead uses two keys: public key used by the send to encrypt message and a private key used by receiver to decode the message. Public key is available for everyone to use but private kept secret
authentication: digital signatures
used to authenticate messages. Sender uses private key to create the digital signature, which includes an encrypted unique number called a "digest" based on the contents of the original message . Use public key to make sure it came from the send and hasn't been tampered with
- -system used to insulate an organization's intranet from the internet. used to authenticate an outside user of the network, verify his or her level of access authority and then direct the user to the program.
- -Also protect LANS from unauthorized internal acess
two types of firewalls
network file wall
network level firewall
provides basic screening of low security messages (email) and routes them to their destinations based on the source/destination addresses attached
application level firewall
provides high quality level network security. Configure to run security applications called proxies
proxies: perform sophisticated functions (i.e. authentication)
seals of assurance
evidences that web-based business is trustworthy
SIX trusted 3rd party organizations companies
- Better Business Beureau (nonprofit)
- VERI-sign INC.
- International Computer association
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