Kerckhoffs' Principle is:

Question 2 options:

1)	A cryptography algorithm must be assumed to be well-known.

2)	The right-hand rule for electricity and magnetism.

3)	It is crucial to keep the algorithm secret from adversaries.

4)	Encrypting should not increase the size of the message.

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Question 3 (5 points)

A stream cipher would be most appropriately used for:

Question 3 options:

1)	Data that are divided into blocks of 64 bits.

2)	A telephone conversation.

3)	Relatively small messages.

4)	Messages that must be confidential only for a few weeks.

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Question 4 (5 points)

Which encryption algorithm is most appropriate for checking whether a message has been altered?

Question 4 options:

1)	public key cryptography.

2)	cryptographic hash algorithms.

3)	symmetric key cryptography.

4)	hybrid cryptography.

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Question 5 (5 points)

Certificate pinning means

Question 5 options:

1)	once a browser as seen a valid certificate for an entity, it will not accept another certificate without warning the user.

2)	a user must manually install the certificate, and no other will be accepted.

3)	the user must enter a personal identifying number to allow a certificate to be accepted.

4)	the user must enter a personal identifying number each time the certificate is used.

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Question 6 (5 points)

Use of encryption is most appropriate

Question 6 options:

1)	when the protections provided by the operating system cannot work.

2)	any time there is confidential data.

3)	for online database systems.

4)	for data in storage.

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Question 7 (5 points)

The two critical properties of a cryptographic key are

Question 7 options:

1)	it should be long and repeating.

2)	It should be long and random.

3)	it should be short and random

4)	it should be long and follow a prescribed pattern.

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Question 8 (5 points)

One can break a Csar cipher with a key of one (one letter down in the alphabet) by inspection. What is the most appropriate approach for longer keys?

Question 8 options:

1)	Letter frequency analysis.

2)	translation from Latin to English.

3)	Brute force.

4)	An inverse character map.