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