Font size
WorksheetsKhan Academy Cryptography
Total questions: 10
Worksheet time: 6mins
In order for a one-time pad to work properly, the key must:
Be as long as the message
Be created using a multi-sided die
Be created using a random number generator
One-time pads are inherently secure because they are never used twice
Poly-alphabetic ciphers are:
used to flatten the letter pattern frequency
impossible to solve because of the randomness of the letters
secure because they do not leak information
easy to solve because there are fewer possibilities to consider
Poly-alphabetic ciphers use ______________ to encode messages
shift keys
one-time pads
RSA encryption
multiple languages
Poly-alphabetic ciphers are more secure based on
The length of the key
The length of the message
The time it takes to transmit the message
The power of the computer encoding it
t
The Caesar cipher is a _____________
substitution cipher
military-grade encryption
unbreakable code
very difficult to decode
The maximum number of possibilities for a Caesar cipher in ENGLISH is:
25
26
about 15,000
about 2 million
Frequency analysis is
determining the % of time a letter appears in a given language
determining the % of times an encryption key is used
determining how often a Caesar cipher is repeated
a complex mathematical formula usually conducted using super computers
What is the solution to this "classic" Caesar cipher?
Kdssb Kdoorzhhq
(a)
Encode WATER using a Caeser cipher with a +2 shift
(a)
How can you determine if a sequence of numbers is truly random?
By counting the occurrence of each number
By using the frequency stability property
By using the enigma theory of randomness
There is no way to determine this
b
