COSC 354 Networks - Cryptography Exam Questions and Answers Fully Solved Latest Version
2025-2026
What is a cryptosystem? - Answers is an implementation of cryptographic techniques and their
accompanying infrastructure to provide information security service. Also know as a cipher
system.
Basic components of a cryptosystem? - Answers Plaintext, Encryption algorithm, ciphertext,
decryption algorithm, encryption key, and decryption key.
What is cryptanalysis? - Answers It is the science of analyzing and breaking secure
communication, also called attackers.
The first known evidence of cryptograph can be traced to the use of? - Answers Hieroglyph.
Some 4000 years ago.
What is the Caesar Shift Cipher? - Answers Relies on shifting the letters of a message by an
agreed number. (three was a common choice.) The recipient of this message would shift the
letters back.
What is the Kamasutra Cipher? - Answers Is one of the earliest known substitution methods.
around 400BC
What was the goal of cryptography? - Answers Is to secure important data on the hard disk as it
passes through a medium that may not be secure itself. Usually that medium is a computer
network.
Cryptography can provide four services? - Answers Confidentiality, Integrity, Authentication, Non
-repudiation.
What is Confidentiality - Answers Also known as Secrecy, Ensuring that no one can read the
message except the intended receiver.
Data is kept secrete from those without proper credentials.
What is integrity - Answers Anti-tampering, Assuring the receiver that the receive messaged has
not been altered in any way from the original.
What is authentication? - Answers Cryptograph can help enstablish identity fro authentication
purposes. The process of proving ones identity.
What is Non-repudiation? - Answers A mechanism to prove that the sender really sent this
message.
Types of Cryptography? - Answers Symmetric Key Cryptography, Asymmetric Key Cryptography,
2025-2026
What is a cryptosystem? - Answers is an implementation of cryptographic techniques and their
accompanying infrastructure to provide information security service. Also know as a cipher
system.
Basic components of a cryptosystem? - Answers Plaintext, Encryption algorithm, ciphertext,
decryption algorithm, encryption key, and decryption key.
What is cryptanalysis? - Answers It is the science of analyzing and breaking secure
communication, also called attackers.
The first known evidence of cryptograph can be traced to the use of? - Answers Hieroglyph.
Some 4000 years ago.
What is the Caesar Shift Cipher? - Answers Relies on shifting the letters of a message by an
agreed number. (three was a common choice.) The recipient of this message would shift the
letters back.
What is the Kamasutra Cipher? - Answers Is one of the earliest known substitution methods.
around 400BC
What was the goal of cryptography? - Answers Is to secure important data on the hard disk as it
passes through a medium that may not be secure itself. Usually that medium is a computer
network.
Cryptography can provide four services? - Answers Confidentiality, Integrity, Authentication, Non
-repudiation.
What is Confidentiality - Answers Also known as Secrecy, Ensuring that no one can read the
message except the intended receiver.
Data is kept secrete from those without proper credentials.
What is integrity - Answers Anti-tampering, Assuring the receiver that the receive messaged has
not been altered in any way from the original.
What is authentication? - Answers Cryptograph can help enstablish identity fro authentication
purposes. The process of proving ones identity.
What is Non-repudiation? - Answers A mechanism to prove that the sender really sent this
message.
Types of Cryptography? - Answers Symmetric Key Cryptography, Asymmetric Key Cryptography,
