ITN 266 Exam practice questions and answers |100% pass
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Course
2024/2025
Institution
2024/2025
ITN 266 Exam practice questions and
answers |100% pass
What is cryptography? - Answer-The use of mathematical operations to protect messages
traveling between parties or stored on a computer.
What is a cipher? - Answer-A specific mathematical process used in encryption and
decryption
What is ...
Key length - Answer✔✔-Each additional bit in the key doubles the time it will take to crack they
key (100 bits or longer is considered strong today)
Data Encryption Standard (DES) - Answer✔✔-DES quickly became the most widely used
symmetric key encryption method.
Describe DES block encryption. - Answer✔✔-DES is a block encryption standard - it encrypts 64
bits at a time. 56-bit 8 redundant bits = 64 bit ciphertext block
Triple DES (3DES) - Answer✔✔-Extends the effective key size of DES in a simple but painfully
slow way that uses a moderate amount of RAM (when firms need stronger encryption than DES
provides)
Advanced Encryption Standard (AES) - Answer✔✔-Released in 2001, efficient enough in terms
of processing power and RAM requirements to be used on a wide variety of devices, from cell
phones to personal digital assistants. Three alt key length: 128, 192, and 256 bits.
Security through obscurity - Answer✔✔-the principle of relying on secrecy to create security by
hiding potential vulnerabilities.
Cryptographic system - Answer✔✔-A packaged set of cryptographic countermeasures for
protecting dialogues - more than just cryptography
Why is the first handshaking stage the negotiation of security methods and options? -
Answer✔✔-Handshaking is when two parties (devices or programs) begin to communicate via a
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