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Blocking of services
DoS, DDoS, Jamming and Blocking of contents
Presentation by René Eichhorn, André Bosbach, Erki Mullamaa, Gervin Kalvet
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1. DoS Attack
1.1 Definition
1.2 Reasons for DoS Attacks
1.3 Purpose of DoS
1.4 How it works
Table of contents
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2. DDoS Attack
2.1 Definition of a botnetwork
2.2 Difference between DoS and DDoS
2.3 Countermeasures of internet providers
3. Jamming
3.1 History
3.2 Radio jamming and deceptions
3.3 Countermeasures
Table of contents
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4. Blocking contents
4.1 Restrictions set by authorized people
4.2 Legal actions by the government
4.3 Overblocking and underblocking
Table of contents
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DoS Attack
DoS Attack DDoS Attack JammingBlocking
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• is called denial of Service
• stresses the internet connection
• floods the server
• do not require passwords
1.1 Definition
DoS Attack DDoS Attack JammingBlocking
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• competition
• money
• terrorism
• boredom
1.2 Reasons for DoS Attacks
DoS Attack DDoS Attack JammingBlocking
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• overload server
• shut down server
• cause economic harm
1.3 Purpose of DoS
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• send redundant data → effects:
• data can not be processed
• server is overloaded
• server stops working
1.4 How it works
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DDoS Attack
DoS Attack DDoS Attack JammingBlocking
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• mostly infected by a Trojan
• Typ of a Virus
• caused by download on unsafe websites
• effects:
• infection with a virus
• control of computer
2.1 definition of a botnetwork
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• A Botnetwork sends many
requirements to one
website.
• The hacker controls these
bots.
2.1 definition of a botnetwork
DoS Attack DDoS Attack JammingBlocking
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2.2 Difference between DoS
and DDoS
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DDoS DoS
Distributed Denial of Service Denial of Service
several attacks by botnetwork
(many PCs)
single attack
(one PC)
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Server Operator:
• special software
• On-Premise: programm in the internet server
• In-the-Cloud: programm in the cloud from the server
• sufficient storage capacity on webserver
2.3 Countermeasures
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Users:
• Do not open E-Mail attachments
• Do not download from unsafe websites
• Install current software updates
• Install a virus scanner
2.3 Countermeasures
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Jamming
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• Jamming with any device• blocks,
• jams,
• interferes
• Authorized wireless communications
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Definition of jamming
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• Used in many wars
• Used to block content from other countries
3.1 Jamming history
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• Mechanical jamming• chaff - metal strip frequence reflector
• corner reflectors - many-sided objects
• decoys - maneuverable flying object
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3.2 Jamming types
DoS Attack DDoS Attack JammingBlocking
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• Cloaking outgoing signal
• Limiting insecure communication
• Frequency hopping
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3.3 Countermeasures
DoS Attack DDoS Attack JammingBlocking
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Blocking
contents
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• Block content from users
• Block websites that violate law
• Keep people safe from dangerous sites
4. Definition of blocking contents
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• Prevent users from surfing specific sites
• Set passwords for programs users should not use
• Limit usage
4.1 Restrictions set by authorized
people
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• Government can block content from companies or
citizens
• Government can block communication among
companies
• Child online protection
• Govware
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4.2 Legal actions by the government
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• Underblocking -• Filters fail to block all pornography websites and
other adult content.
• even if filters activated, children and young people
can see pornography
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4.3 Underblocking
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- block websites that should be accessible
• Facebook is blocked in China
• Wikipedia in Turkey
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4.4 Overblocking
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Thank you for your
Attention!
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