Cyber security is important to protect against increasing cyber crimes and attacks. There are various types of cyber crimes like hacking, theft and cyber stalking. Hackers are individuals who use technical skills to overcome problems but sometimes commit crimes by illegally accessing systems. Common cyber attacks include fraud, spying, stalking and warfare. It is important for social media users to take safety measures like using strong unique passwords and customizing privacy settings to protect themselves from attacks targeting popular sites like Facebook, Twitter, Gmail and Netflix. Cryptography provides confidentiality and integrity of messages through techniques like substitution and transposition ciphers, and also asymmetric key cryptography using public and private keys.

1. CYBER SECURITY ON SOCIAL MEDIA
G.CHARITHA
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1) WHAT IS CYBER SECURITY?
2) CYBER CRIME
i) TYPES OF CYBER CRIME
ii) HACKERS
3) CYBER ATTACKS
3) WHY CYBER SECURITY?
4) SAFETY MEASURES
5) CRYPTOGRAPHY

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1) WHAT IS CYBER SECURITY?
Cybersecurity is the body of technologies, processes and
practices designed to protect networks, computers,
programs and data from attack, damage or unauthorized
access.

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2) CYBER CRIME
It is simply a crime that encompasses any criminal act
dealing with computers and networks .
This may include committing crimes like identity theft ,
various email scams , violating privacy etc.

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i) TYPES OF CYBER CRIMES
Cyber crimes are broadly classified into three categories,
namely crimes against:
❏ Individual
❏ Property
❏ Government

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Cyber Crime may take many forms. The most
common ones are :
❏ Hacking
❏ Theft
❏ Cyber Stalking
❏ Malicious software
❏ Child soliciting and Abuse
❏ Denial of service attack

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ii) HACKERS
A hacker is an individual who uses computer, network or
other technical skills to overcome a technical problem.
➔ But often refers to a person who uses his/her
abilities to gain unauthorised access to systems or
networks in order to commit crimes, steal information
to hurt people etc.
➔ This process is called as “Hacking”.
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3) CYBER ATTACKS
It is an attempt by hackers to damage or destroy a
computer network or system.
➔ According to the Global State of Information Security
survey 2015, there are approximately 81 attacks per
minute.
➔ Types of cyber attacks:
❏ Cyber fraud
❏ Cyber spying
❏ Cyber stalking and bullying
❏ Cyber assault
❏ Cyber warfare

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❏ Cyber fraud
➔ Cyber attacks that are generally aimed at gaining
monetary or related gains for the hacker.
➔ Includes phishing attacks combined with fake websites to
steal users personal details and also their money.
❏ Cyber spying
➔ The main motive of this attack is to gain the info for the
hacker and thus sell the info gained and make money.

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❏ Cyber stalking and bullying
➔ Designed to frighten and intimidate individuals .
➔ Usually social media based - Ask.fm,Facebook,Twitter.

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❏ Cyber assault
➔ Aimed at causing damage to info or equipment that is
being attacked.
➔ Damage may be physical or reputational or corruption or
deletion of important info.
❏ Cyber warfare
➔ An extreme form of cyber-assault where at least one of
the parties involved is a nation state.
➔ These are much harder to validate.

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➔ Everyday we come across many cyber attacks especially
using the social media. The frequently used sites
include:
❏ Facebook
❏ Twitter
❏ Gmail
❏ Netflix

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3) WHY CYBER SECURITY?
Cyber Security is much needed thing nowadays because
of:
★ Increase in Cyber crimes
★ Increase in Cyber attacks
★ Data being unsecured

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4) SAFETY MEASURES
The common safety tips for safe browsing on any social
networking sites are:
★ Use unique password for each social network.
★ Don’t be too personal.
★ Customize privacy options.
★ Block spammers.
★ Sensitive browsing should always be done on a network
that you trust.
★ Don’t trust, just verify!
★ Watch what you are sharing on social networks.
★ Report and control abusive comments.

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❏ Safety tips for frequently used social site - “FACEBOOK”
i) Set the privacy settings on your profile to “Friends”:

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ii)Always monitor pictures that other people put of you and
tag you on.

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iii) Be cautious of the statues, photos and
videos etc.

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iv) Avoid putting your basic info and contact
details.

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v) Avoid posting info about an upcoming vacation or trip
as status

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vi)Change your password often.

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vii) Be careful on who you friend!!!
viii) Before clicking on a link from facebook, always
remember to check the address bar, displaying
“www.facebook.com/” and not “www.facebook1.php” etc.

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24. History
The first evidence of use of cryptography(in some form)
was found in an inscription carved around 1900 BC, in the
main chamber of the tomb of the nobleman Khnumhotep
II, in Egypt.
★ Around 100 BC Julius Caesar was known to use a form
of encryption to convey secret messages to his army
generals posted in the war front.
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25. CRYPTOGRAPHY
Cryptography is the science and art of transforming the
messages to make them secure and immune to attack.
➔ Provides Confidentiality,Integrity and Accuracy.
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Ancient Cipher

27. Main Terms
❏ Plain text
❏ Ciphertext
❏ Keys
❏ Cipher
❏ Encryption & Decryption
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29. Categories of Cryptography
❏ Symmetric Key Cryptography
❏ Asymmetric Key Cryptography
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30. Symmetric key Cryptography
Also known as secret key.Sender & Receiver uses same
key and an encryption/decryption algorithm to
encrypt/decrypt the data.
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32. Traditional Ciphers for Symmetric Cryptography
❏ Substitution Cipher
❏ Transposition Cipher
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33. Substitution Cipher
A technique in which the letters/numbers/symbols of plain
text are changed into other letters/numbers/symbols.
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34. Transposition Cipher
Here, the positions of the letters/number/symbols in the
plain text are changed with one another.
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35. Asymmetric key Cryptography
Also known as public key cryptography.
➔ Sender and Receiver uses different keys for encryption
and decryption namely PUBLIC and PRIVATE.
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