Caesar cipher

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Julien Ugon

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1 year, 8 months ago

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Julien Ugon 1 year, 8 months ago

Gave some feedback: Ready to use

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Julien Ugon 1 year, 8 months ago

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Julien Ugon 1 year, 11 months ago

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Question statement

Caesar wants to organise a secret meeting with Marc Anthony. He sends Marc-Antony the secret message {ciphertext} using a shift cipher. Where do Caesar and Marc Anthony meet (enter your answer in capital letters)?

Give any introductory information the student needs.

			Name	Type	Generated Value

shift	integer	22
plaintext	string	BATHS
ciphertext	string	XWPDO
cipher	list	[ 23, 22, 15, 3, 14 ]
shifts	list	Nested 26×5 list
translations	list	List of 26 items
advice	html	HTML node

Automatically regenerate variables?

Name

Data type

Value

A random number between and (inclusive) with step size

Description

Describe what this variable represents, and list any assumptions made about its value.

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Generated value: `integer`

→ Used by:

cipher

This variable doesn't seem to be used anywhere.

Parts

Match text pattern

Match text pattern

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Marks

Match test

Answer pattern

Show correct answer on reveal?

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Advanced settings

Must the answer be in the correct case?

Advice

We do not have the key to decrypt the message, so we need to try every possible key and choose the answer that is intelligible.

To apply a key $k$ to the string, each letter $x$ is substituted with $x+k\pmod{26}$ , where $x$ is the place of the letter in the alphabet. This gives us the strings {advice}

Of those the only one that makes sense is the one for $k=\var{26-shift}$ , {plaintext}. Therefore this is where Caesar and Marc-Anthony will meet.

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Part	Test	Passed?
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This question is used in the following exam:

classical-exam by Guillermo Pineda in SIT281.

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Taxonomy: mathcentre

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Taxonomy: Context

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Checkpoint description

Julien Ugon 1 year, 8 months ago

Julien Ugon 1 year, 8 months ago

Julien Ugon 1 year, 11 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Match text pattern

Advanced settings

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Caesar cipher

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Julien Ugon 1 year, 8 months ago

Julien Ugon 1 year, 8 months ago

Julien Ugon 1 year, 11 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Match text pattern

Advanced settings

Generated value: `integer`