Keyless Algorithms in Network Security

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What is the purpose of a public-key encryption scheme?

To generate a pair of keys for each user

To allow different keys for encryption and decryption (correct)

To produce scrambled messages as output

To perform various transformations on the plaintext

How many components are there in a public-key encryption scheme?

Five components

Six components (correct)

Four components

Three components

In the context of public-key encryption, what is the role of the public register?

To store the decryption algorithm

To store the private key

To store the ciphertext

To store one of the keys for encryption and decryption (correct)

What is the purpose of the encryption algorithm in a public-key encryption scheme?

To perform transformations on the plaintext Signup and view all the answers

What property ensures that for a given message, two different keys will produce two different ciphertexts?

Two-Key Algorithms Signup and view all the answers

Which step is essential in public-key encryption according to the text?

Generating a pair of keys for each user Signup and view all the answers

What is the purpose of a cryptographic hash function?

Turning variable text into a fixed-length hash value Signup and view all the answers

Which type of algorithm is characterized by producing a deterministic sequence that appears random?

Pseudorandom number generator Signup and view all the answers

What distinguishes a cryptographic hash function from a regular hash function?

Having additional properties for cryptography Signup and view all the answers

In single-key algorithms, what is required for encryption and decryption processes?

A single secret key for both processes Signup and view all the answers

What type of encryption uses an unintelligible transformation based on a secret key?

Symmetric encryption Signup and view all the answers

Which algorithm type does not depend on the use of a secret key?

Pseudorandom number generator Signup and view all the answers

What is the average time required for an exhaustive key search with a 128-bit key, at a rate of 10^6 key combinations per second?

5.4 x 10^24 years Signup and view all the answers

What does a permutation of a finite set of elements entail?

Each element appears exactly once Signup and view all the answers

In the context of symmetric encryption algorithms, what does a key size of 56 bits translate to in terms of the number of alternative keys?

7.2 x 10^16 Signup and view all the answers

What is the significance of a rate of one billion (10^9) key combinations per second in today's multicore computers?

It is considered an acceptable speed for encryption Signup and view all the answers

How does the speed of the attacking system affect the time required to break a code using a 128-bit key?

Even with a trillion (10^12) times speed increase, it still takes over 100,000 years Signup and view all the answers

What is the essence of a symmetric encryption algorithm?

It utilizes the same key for both encryption and decryption Signup and view all the answers