Running Head: COMPUTER SECURITY
Rivest-Shamir-Adleman (RSA) is an algorithm that is applied in computers to encrypt
and decrypt messages. The algorithm was got its initials after its founders, Ron Rivest,
Adi Shamir, and Leonard Adleman. After being founded as an independent corporation in
1982, the RSA security algorithm was taken by EMC Company in the year 2006.
The algorithm uses two different keys for encryption and decryption. This, therefore,
implies that the RSA algorithm is found in the family of asymmetric cryptography. RSA
uses two different keys: a public and a private key. The public key is known to anyone,
and it the key that is applied when encrypting the message. On the other hand, the private
key is used for decryption, and it's only known to the person the message is intended for.
In encryption, Caesar cipher is said to be one of the most straightforward encryption
algorithms. It uses substitution where letters in the plain text are substituted by some
number of positions that are fixed down the alphabet. For example, when using a left
shift of 3, the information will look as follows.
Therefore, when one sends the message:
Plain: Yesterday, the lessons were interesting since the lecturer was in a good mood.
Cipher: VBPQBOAXV QEB IBPPKJP TBOB VJQBOBPQVJD PVJZB QEB
IBZQROBO TXP VJ X DKKA IKKA
Therefore, the message that will be sent is:
VBPQBOAXV QEB IBPPKJP TBOB VJQBOBPQVJD PVJZB QEB IBZQROBO TXP
VJ X DKKA IKKA
A firewall is said to be a security measure that is imposed on a network that monitors the
network traffic that is incoming and outgoing and permits or blocks the data packets basing on
the set of security rules. The primary function of the firewall is to create a block between the
internal network and the external sources so that the malicious traffic like viruses are blocked.
There are different firewall security techniques which include:
Packet filtering firewall
This type of firewall is responsible for filtering and checking incoming data packets and only
allowing data from specific IP addresses and port numbers.
Circuit level firewall
This is the type of firewall that operates at the session level to monitor the TCP handshakes.
Stateful inspection firewall
The firewall is used to filter both data packet as well as filtering the sessions. It chec...
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