Security 3 :

Access control :is way of limiting access to a system or to physical or virtual resources

HMAC is a message authentication code (MAC) that is calculated using a hash function and a secret key. Hash-based Message Authentication Code (HMAC) is a message authentication code that uses a cryptographic key in conjunction with a hash function.

Ping sweep : where the attacker scan every Mac in that subnet and to check whether there is live hosts

Stream cipher each bit or byte in the plain text is encrypted one at a time. Usually the plan text is combined with a separate random generated message/messages.

Describe the Process of what happens in network scanning :

Select the True Characteristics of a transport encryption

Stream cipher each 100 words in the plain text is encrypted one at a time. Usually the plan text is combined with a separate random generated message/messages.

Viruses are those that infects executable files and they can be transferred on datafiles once the user runs the exe file the virus activates and will do a harmful process to the computer system or network it will also have the capability of adapting and attaching to other files meaning it can replicate itself and attaches to other files.

Explain and make a difference between a virus and a worm Viruses are those that infects executable files and they can be transferred on datafiles once the user runs the exe file the virus activates and will do a harmful process to the computer system or network it will also have the capability of adapting and attaching to other files meaning it can replicate itself and attaches to other files. While worms Worms usually "lives" inside of files often their habitat is in word or excel documents. The worm will use a host file in a way that it will release a document that has already a worm in it. The entire document will travel from computer to computer. Worms spread fast acrosss a network therefore causing a wide spread infection which then can lead a crash on a machine or in worst cases is the flooding of a network connection.

Explain and make a difference between a virus and a worm Viruses are those that infects email files and they can be transferred on datafiles once the user runs the exe file the virus activates and will do a harmful process to the computer system or network it will also have the capability of adapting and attaching to other files meaning it can replicate itself and attaches to other files. While worms Worms usually "lives" inside of files often their habitat is in word or excel documents. The worm will use a host file in a way that it will release a document that has already a worm in it. The entire document will travel from computer to computer. Worms spread fast acrosss a network therefore causing a wide spread infection which then can lead a other viruses on a machine or in worst cases is the flooding of a network connection.

A sniffer is a tool that captures frames moving over the network medium. This might be a cabled or wireless network.

A Man-in-the-Middle attack is where the attacker sits between two communicating hosts, and transparently captures monitors, and relays all communication between the hosts.

A spoofing (or masquerade) attack involves the attacker does not imitating some sort of resource that the victim thinks is genuine.

A spoofing (or masquerade) attack involves the attacker imitating some sort of resource that the victim thinks is genuine.

This term refers to phony email messages, usually advertising pornography, miracle cures, bogus investments, etc.​

Spam is also used to launch phishing attacks and spread viruses and worms​

Software that monitors user activity and sends the information to someone else​ Spyware may generate browser pop-up windows to try to direct the user to other websites​ ​ Adware is any type of software or browser plug-in that displays adverts.​ Some adware may exhibit spyware-like behaviour, by tracking the websites a user visits and displaying targeted ads for instance.​

Also called Trojan horses​ A program that disguises itself as some other known software or file. ​ Trojans do not self-replicate​ Actually the main purpose may be stealthy and ​ to go unnoticed​

Block cipher encryption uses

Stream cipher uses

MD5 is used for

In the authentication credentials , something you know is the most

Access control is Granting or denying an access of a rescource

Linux permission are divided in

We arrive at the appropriate number by assigning each type of permission a numerical value:​ 4 = read permissions​ 2 = write permissions​ 1 = execute permission​

We arrive at the appropriate number by assigning each type of permission a numerical value:​ 1 = read permissions​, 6 = write permissions,​ 2 = execute permission​

Since reconnaissance is a first step to additional attacks, it is necessary to reduce the opportunities to an attacker.​ A security professional can detect a network scan while it is happening by configuring alarms to send notifications.​

Ftp(TCP) is Port :

SSH(TCP) is port :

Telnet(TCP) is Port :

Smtp(TCP) Is port :

DNS(TCP + UDP) is port

HTTP(TCP) is port :

HTTPS ( TCP) is port :

Netbios(TCP + UDP ) port range is : 135-139

Netbios(TCP + UDP ) port range is : 130-145

Smb (tcp) is port :