Capability-based security in Operating Systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to define capability-based security.

Operating Systems

In capability-based security, a [1] is a communicable, unforgeable token of authority.

Drag options to blanks, or click blank then click option'

Acapability

Bpassword

Cfirewall

Dencryption

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing capabilities with passwords or encryption.

A capability is a token that grants access rights to an object or resource in capability-based security.

2fill in blank

medium

Complete the sentence to explain how capabilities are used.

Operating Systems

A process must present a valid [1] to access a resource in capability-based security.

Drag options to blanks, or click blank then click option'

Atoken

Bcertificate

Cusername

Dcapability

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing general terms like 'token' or 'certificate' instead of the specific term.

In capability-based security, a process uses a capability as proof of its right to access a resource.

3fill in blank

hard

Fix the error in the statement about capability-based security.

Operating Systems

[1] are used to restrict access by identity rather than by possession of tokens.

Drag options to blanks, or click blank then click option'

Aaccess control lists

Bpasswords

Ccapabilities

Dencryption keys

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing capabilities with ACLs or passwords.

Access control lists (ACLs) restrict access by identity, while capability-based security restricts access by possession of capabilities (tokens).

4fill in blank

hard

Fill both blanks to complete the dictionary comprehension that filters capabilities with read access.

Operating Systems

read_caps = {obj: cap for obj, cap in caps.items() if cap [1] 'read' and cap [2] 'write'}

Drag options to blanks, or click blank then click option'

A==

B!=

Cand

Dor

Attempts:

3 left

💡 Hint

Common Mistakes

Using logical operators incorrectly or mixing equality and inequality.

The code selects capabilities equal to 'read' and not equal to 'write'.

5fill in blank

hard

Fill all three blanks to create a dictionary of capabilities with 'execute' permission and object names in uppercase.

Operating Systems

exec_caps = [1]: cap for obj, cap in caps.items() if cap [2] 'execute' and obj.[3]()

Drag options to blanks, or click blank then click option'

Aobj.upper()

B==

Cupper

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing method names or using wrong comparison operators.

The dictionary uses the uppercase object name as key, checks if capability equals 'execute', and calls upper() method on the object name.