Slides in this set

Slide 1

Preview of page 1

IT3 - WJEC…read more

Slide 2

Preview of page 2

Access Restrictions
· Access to computer rooms can be restricted by the use of
key pads, use of biometric testing (advantage is that there
is no passwords or codes to remember)
· Face recognition systems can restrict access to both
rooms and computers. It could even be used to monitor
the time users are at their workstations…read more

Slide 3

Preview of page 3

· Coding data whilst it is being sent over a network so that
only the true recipient is able to decode it. Should it be
intercepted by a hacker, the data will be in code and
meaningless…read more

Slide 4

Preview of page 4

How encryption works
· Jayne in London wants to send a secure email to Jack in Paris.
After she has typed the email she presses the `encrypt' option. The
software then verifies who she wants to send the email too. Jayne
then chooses Jack off a list of all the people whom Jayne has a
public key for and can send encrypted messages too. The
encryption software then automatically mixes and re-mixes every
binary bit of the message with ever bit in Jack's public key. The
result is a binary mix of data that may be unscrambled only by the
same software but using Jack's private key. When Jack receives his
email in Paris, he needs to select the `decrypt' option and the
software then will ask him for his password, it will then decrypt his
private key. The private key if a very long number and a large
number of calculations are then performed which unscrambles the
binary mess to give the message from Jayne. If the message was
interpreted by a hacker, they would be unable to see the message
because they do not have Jack's private key that is needed so that
the binary is unscrambled to reveal the message.…read more

Slide 5

Preview of page 5

Proxy Servers
· A proxy server is a server which can be hardware or
software that takes requests from users for access to
other servers and either forwards them onto servers or
denies access to servers.
· Can be used to limit or block access to certain web
addresses or web services such as instant messaging
and chat rooms
· Proxy servers are used in schools to make sure the pupils
can only access certain information
· Many organisations use proxy servers to provide content
filtering and to ensure that their employees stick to their
acceptable use policy.…read more

Slide 6

Preview of page 6

Security Status
· Use of hierarchy of passwords
· Allocation of network resources to users based on user-
IDs and passwords
· Allocation of access rights to users based on their job or
seniority (e.g. read only, append only, create new records
only etc.)…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8


No comments have yet been made

Similar ICT resources:

See all ICT resources »