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WorksheetsP3 IAS 2 Quiz
Total questions: 15
Worksheet time: 45mins
What does a substitution cipher do?
Changes the order of letters in a message
Replaces each letter with another letter or symbol
Scrambles the words in a sentence
Converts letters into binary code
In a basic shift cipher, what happens to each letter in the message?
It is replaced with a symbol
It is moved a certain number of places in the alphabet
It is deleted from the message
It is converted into a number
If you apply SC 3 (Shift Right by 9) starting from the letter "B", what would be the next new letter?
K
L
M
J
Which of the following makes a substitution cipher stronger?
Increasing the shifting value
Using multiple shifts or additional transformations
Writing the text in uppercase letters
Making the message shorter
What is the main principle of a transposition cipher?
Replacing each letter with a different letter
Encoding text using ASCII values
Encrypting using mathematical functions
Changing the order of letters in the message
If the phrase "SACK GAUL SPARE NO ONE" is encrypted using a transposition cipher, what happens?
The order of the words and letters are scrambled
The letters are shifted forward
Each letter is replaced with another letter
The message becomes unreadable and cannot be decrypted
Which of the following makes a transposition cipher harder to break?
Using longer messages
Applying multiple transpositions in sequence
Only using it for short messages
Using numbers instead of letters
Which of the following is true about transposition ciphers?
They only work with short messages
They completely change the meaning of a message
The letters remain the same but their positions are altered
They are impossible to decrypt
What is the primary reason RSA encryption is considered secure?
The difficulty of multiplying two prime numbers
Computers cannot handle mathematical problems
The computational complexity of factoring two large prime numbers
The ease of using symmetric keys in encryption
What is the correct formula to compute `N` in the RSA algorithm?
N=p+q
N=p×q
N=p−q
N=p^q
What condition must be satisfied when selecting E (the public exponent)?
It must be equal to the private exponent
It must be an even number
It must be a prime number
It must be greater than the Totient φ(N)
What equation must be satisfied when computing the private exponent D?
(D×E)mod N=1
(D+E)mod φ(N)=1
(D×E)mod φ(N)=1
(D−E)mod φ(N)=1
Who were the developers of the RSA algorithm?
Ron Rivers, Adi Sharif, and Leonard Alderman
Ron Reeves, Adi Shapiro, and Leonard Adelson
Ron Rives, Adi Shamur, and Leonard Aldemann
Ron Rivest, Adi Shamir, and Leonard Adleman
What is the purpose of the private key in RSA encryption?
It is used to decrypt messages encrypted with the public key
It is shared with everyone to encrypt messages
It generates the totient function φ(N)
It selects the two prime numbers used in RSA
Which of the following is true about RSA encryption?
The same key is used for both encryption and decryption
Only the private key decrypts a public-key message
RSA is a symmetric encryption algorithm
A message encrypted with the private key cannot be decrypted
