CLIL2
Presentation
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Computers
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Professional Development
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Practice Problem
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Hard
Tommaso Paoli
Used 5+ times
FREE Resource
1 Slide • 8 Questions
1
2
Fill in the Blanks
What is the first type of key cipher in which both Alice and Bob have the same key?
(DOUBLE - ASYMMETRIC - SYMMETRIC - SESSION)
3
Multiple Choice
What was the problem of symmetric-key cipher?
If someone intercepts the encrypted message, they can rewrite it using another new key and send it to the recipient
It’s not always feasible to assume that both Alice and Bob possess a unique key unknown to others
It’s not always easy to use
It’s not possible to encrypt a message with a key and use the same key to decrypt it
4
Fill in the Blanks
What is the second type of key cipher in which both Alice and Bob have their own pair of keys (public and private)?
(DOUBKLE - ASYMMETRIC - SYMMETRIC - SESSION)
5
Multiple Choice
What was the problem of asymmetric-key cipher?
If someone intercepts the encrypted message, they can rewrite it using another new key and send it to the recipient
It’s not always feasible to assume that both Alice and Bob possess a unique key unknown to others
It’s not always easy to use
It’s not possible to encrypt a message with a key and use the same key to decrypt it
6
Fill in the Blanks
What is the third type of key cipher in which both Alice and Bob have their own pair of keys (public and private)?
(DOUBLE - ASYMMETRIC - SYMMETRIC - SESSION)
7
Multiple Choice
What was the problem of double-key cipher?
If someone intercepts the encrypted message, they can rewrite it using another new key and send it to the recipient
Sending an encrypted message is now very costly
It’s not always easy to use
It’s not possible to encrypt a message with a key and use the same key to decrypt it
8
Fill in the Blanks
What is the last type of key cipher that solves all the problems?
(DOUBKLE - ASYMMETRIC - SYMMETRIC - SESSION)
9
Open Ended
How does a double-key cipher work? How many keys are used in a conversation between two parties?
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