Question#1
The Vigenere cipher is a method of encrypting alphabetic text using polyalphabetic substitution.
a) True ✅ - Answer
b) False

Question#2
The Vigenere table used in the cipher is also called the tabula recta.
a) True ✅ - Answer
b) False

Question#3
In the Vigenere cipher, the key must always be longer than the plaintext.
a) True
b) False ✅ - Answer

Question#4
In the Vigenere cipher, encryption can be done with either a Vigenere table or an algebraic formula.
a) True ✅ - Answer
b) False

Question#5
The formula for encryption in the Vigenere cipher without the table is: ei = (pi + ki) mod 26.
a) True ✅ - Answer
b) False

Question#6
If the decryption value in the Vigenere cipher becomes negative, you should multiply by -1.
a) True
b) False ✅ - Answer

Question#7
The one-time pad cipher requires the key to be the same length as the plaintext.
a) True ✅ - Answer
b) False

Question#8
The one-time pad is considered unbreakable when the key is truly random and used only once.
a) True ✅ - Answer
b) False

Question#9
The Hill cipher requires the use of matrices and linear algebra for encryption and decryption.
a) True ✅ - Answer
b) False

Question#10
In the Hill cipher, the key matrix must be a square (n*n) matrix.
a) True ✅ - Answer
b) False

Question#11
The Rail Fence cipher is a type of substitution cipher.
a) True
b) False ✅ - Answer

Question#12
In transposition techniques like the Rail Fence cipher, the actual letters in the plaintext are changed.
a) True
b) False ✅ - Answer

Question#13
The Rail Fence cipher gets its name from the zigzag manner in which it is written.
a) True ✅ - Answer
b) False

Question#14
To decrypt Rail Fence cipher, reconstructing the diagonal rail fence pattern is necessary.
a) True ✅ - Answer
b) False

Question#15
A digital signature guarantees data confidentiality.
a) True
b) False ✅ - Answer

Question#16
A digital signature can be verified by anyone who has the corresponding public key.
a) True ✅ - Answer
b) False

Question#17
A digital signature confirms the integrity of a digital message.
a) True ✅ - Answer
b) False

Question#18
A digital signature for a message is created by encrypting the whole message with the sender's public key.
a) True
b) False ✅ - Answer

Question#19
For a digital signature to be valid, the associated certificate must not be expired.
a) True ✅ - Answer
b) False

Question#20
Digital signatures provide authenticity, integrity, and nonrepudiation.
a) True ✅ - Answer
b) False