18 Questions
What is the goal of cryptanalysis?
To recover the plaintext or the key
What type of attack tries to find an equivalent representation of the encryption algorithm to simplify it?
Algebraic attack
What level of cipher security is theoretically unbreakable, regardless of the amount of time or ciphertext available?
Unconditionally secure
What is the main objective of a brute-force attack?
To try every possible key on a piece of cipher text until an intelligible translation is obtained
What is the main criterion for a computationally secure cipher?
The time required to break the cipher exceeds the useful lifetime of the information
What type of attack involves studying how the plaintexts difference propagates and affects the ciphertext difference?
Differential cryptanalysis
What is the primary characteristic of symmetric encryption?
Uses the same key for sender and receiver
What type of cipher uses different keys for the sender and receiver?
Asymmetric cipher
Which type of cipher processes input elements continuously, producing output one element at a time?
Stream cipher
What is the primary difference between block ciphers and stream ciphers?
Block ciphers process input one block at a time, while stream ciphers process input continuously
What is the purpose of a hash function in symmetric encryption?
To authenticate the sender
What is the primary advantage of asymmetric encryption over symmetric encryption?
Asymmetric encryption provides key exchange and digital signatures
What is the goal of encoding/decoding?
To represent data in a certain format
What is the role of Alice in the cryptosystem?
Sender of an encrypted message
What is the purpose of a cryptographic algorithm?
To disguise a message
What is the difference between a key and a keyspace?
A key is a specific value, while a keyspace is the range of possible values
What is the type of attack that exploits the characteristics of the algorithm?
Cryptanalytic attack
What is the purpose of non-repudiation?
To prevent denial by one of the parties in a communication
Test your knowledge of the fundamental concepts of cryptography, including types of keys, operation types, plaintext process methods, and historical perspectives. Learn about keyless, symmetric, and asymmetric ciphers, substitution, transposition, and product operations, and more.
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