ITN 266 CHAPTER 3 Question and
answers 100% correct 2025/2026
Cryptography - correct answer ✔is the use of mathematical operations to protect messages traveling
between parties or stored on a computer.
Plaintext - correct answer ✔normal text that has not been encrypted
Encryption - correct answer ✔Process of converting readable data into unreadable characters to
prevent unauthorized access.
Ciphertext - correct answer ✔A string of text that has been converted to a secure form using
encryption.
Cipher - correct answer ✔is a specific mathematical process used in encryption and decryption.
Key - correct answer ✔A random string of bits (ones and zeros0
Kerckhoff's Law - correct answer ✔in order to have confidentiality, communication partners only need
to keep the key secret, not the cipher
Brute Force key cracking - correct answer ✔trying all possible keys until the cryptanalyst finds the right
key.
Two mathematical processes in Ciphers - correct answer ✔substitution and transportation
Substitution Cipher - correct answer ✔One character is substituted for another, but the order is not
changed.
answers 100% correct 2025/2026
Cryptography - correct answer ✔is the use of mathematical operations to protect messages traveling
between parties or stored on a computer.
Plaintext - correct answer ✔normal text that has not been encrypted
Encryption - correct answer ✔Process of converting readable data into unreadable characters to
prevent unauthorized access.
Ciphertext - correct answer ✔A string of text that has been converted to a secure form using
encryption.
Cipher - correct answer ✔is a specific mathematical process used in encryption and decryption.
Key - correct answer ✔A random string of bits (ones and zeros0
Kerckhoff's Law - correct answer ✔in order to have confidentiality, communication partners only need
to keep the key secret, not the cipher
Brute Force key cracking - correct answer ✔trying all possible keys until the cryptanalyst finds the right
key.
Two mathematical processes in Ciphers - correct answer ✔substitution and transportation
Substitution Cipher - correct answer ✔One character is substituted for another, but the order is not
changed.
