IB Computer Science Topic A2.4.3 Common Network Countermeasures Revision Notes (HL)

IB Computer Science Topic A2.4.3 Common Network Countermeasures Revision Notes (HL) | RevisionDojo

Content Security Policies (CSPs)

Content Security Policies (CSPs) are a browser-side mechanism designed to prevent malicious code injection attacks, such as cross-site scripting (XSS).

Define Trusted Sources: CSPs specify which domains and sources are allowed to load scripts, stylesheets, images, and other resources.
Block Untrusted Content: By restricting content to trusted sources, CSPs block attempts to inject malicious scripts from unknown origins.

Example

A website sets a CSP that only allows scripts to load from its own domain and a trusted content delivery network (CDN).
This prevents attackers from injecting harmful scripts from other sources.

Complex Password Policies

Complex password policies enforce the use of strong passwords, making them harder to crack.

Requirements: Include a mix of uppercase and lowercase letters, numbers, symbols, and a minimum length.
Additional Measures: Implement password expiration and prevent the reuse of recent passwords.

Example

A company requires employees to use passwords that are at least 12 characters long and include a mix of uppercase, lowercase, numbers, and symbols.

Encrypted Protocols

Encrypted protocols protect data in transit by encrypting communication between devices.

HTTPS: The secure version of HTTP, encrypting data between web browsers and servers.
SSL/TLS Certificates: Digital certificates that validate a server's identity and enable encrypted communication.

Example

When you see "https://" in a website's address bar, it indicates that your data is encrypted, protecting it from eavesdropping and man-in-the-middle attacks.

DDoS Mitigation Tools

Distributed Denial of Service (DDoS) mitigation tools are specialized services or software designed to detect and filter out malicious traffic during a DDoS attack.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Content Security Policies (CSPs)

Content Security Policies (CSPs) are a browser-side mechanism designed to prevent malicious code injection attacks, such as cross-site scripting (XSS).

Define Trusted Sources: CSPs specify which domains and sources are allowed to load scripts, stylesheets, images, and other resources.
Block Untrusted Content: By restricting content to trusted sources, CSPs block attempts to inject malicious scripts from unknown origins.

Example

A website sets a CSP that only allows scripts to load from its own domain and a trusted content delivery network (CDN).
This prevents attackers from injecting harmful scripts from other sources.

Complex Password Policies

Complex password policies enforce the use of strong passwords, making them harder to crack.

Requirements: Include a mix of uppercase and lowercase letters, numbers, symbols, and a minimum length.
Additional Measures: Implement password expiration and prevent the reuse of recent passwords.

Example

A company requires employees to use passwords that are at least 12 characters long and include a mix of uppercase, lowercase, numbers, and symbols.

Encrypted Protocols

Encrypted protocols protect data in transit by encrypting communication between devices.

HTTPS: The secure version of HTTP, encrypting data between web browsers and servers.
SSL/TLS Certificates: Digital certificates that validate a server's identity and enable encrypted communication.

Example

When you see "https://" in a website's address bar, it indicates that your data is encrypted, protecting it from eavesdropping and man-in-the-middle attacks.

DDoS Mitigation Tools

Distributed Denial of Service (DDoS) mitigation tools are specialized services or software designed to detect and filter out malicious traffic during a DDoS attack.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

IB Computer Science Topic A2.4.3: Common Network Countermeasures Notes

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

Content Security Policies (CSPs)

Complex Password Policies

Encrypted Protocols

DDoS Mitigation Tools

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Content Security Policies (CSPs)

Complex Password Policies

Encrypted Protocols

DDoS Mitigation Tools

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account