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ACLs vs Capabilities

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Questions and Answers

Which type of CAPTCHA is NOT mentioned in the text?

Audio
Visual
OCR
Text-based (correct)

What is the purpose of using CAPTCHA?

To index websites by search engines
To prevent access by bots/computers (correct)
To generate and grade tests
To filter out spam emails

What was the original motivation for creating CAPTCHA?

To prevent automated bots from stuffing ballot boxes (correct)
To provide free email services
To index websites by search engines
To challenge humans with difficult tests

What is the main advantage of a packet filter firewall?

Speed (B) Signup and view all the answers

What is the main disadvantage of a stateful packet filter?

Slower than packet filtering (D) Signup and view all the answers

What does a firewall do in the context of network security?

Controls access to a network (C) Signup and view all the answers

What is the purpose of an application proxy firewall?

To provide a complete view of connections and application data (A) Signup and view all the answers

What is the role of a CAPTCHA in preventing automated sign-ups for email accounts?

To prevent access by bots/computers (A) Signup and view all the answers

What is the main challenge in breaking CAPTCHAs?

Segmentation problem (C) Signup and view all the answers

What is the analogy used to describe the role of a firewall?

A secretary filtering meeting requests (B) Signup and view all the answers

Which access control mechanism is easier to prevent the problem of a confused deputy?

Capabilities (A) Signup and view all the answers

What is the main disadvantage of using Capabilities as an access control mechanism?

It is more difficult to implement (B) Signup and view all the answers

What is the purpose of a CAPTCHA?

To tell humans and computers apart (D) Signup and view all the answers

What is the main advantage of using ACLs as an access control mechanism?

It is data-oriented (A) Signup and view all the answers

What is the main disadvantage of using ACLs as an access control mechanism?

It is difficult to delegate authority (B) Signup and view all the answers

What is the purpose of a CAPTCHA being 'automated'?

To generate and score tests (D) Signup and view all the answers

What is the purpose of a CAPTCHA being 'public'?

To tell humans and computers apart (A) Signup and view all the answers

What is the purpose of a CAPTCHA being a 'Turing test'?

To tell humans and computers apart (C) Signup and view all the answers

What is the purpose of a CAPTCHA being 'human interactive proof'?

To test the knowledge of users (D) Signup and view all the answers

What is the main challenge with ACLs to avoid the problem of a confused deputy?

Maintaining association between authority and intended purpose (C) Signup and view all the answers

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