Cryptography Quiz Study

In asymmetric cryptography, public keys can be broadly shared over non-secure channels and used by others to encrypt messages

True

Which of these is a public key encryption algorithm?

RSA

Which of the following are symmetric key ciphers? Select all that apply

AES & DES

Which of these are true about hash functions? (Select all that apply)

1.Hash functions allow any size input and produce a fixed number of bits for its hash

2. Hashes can be used to detect a change in a file

3. If hash values of two files are the same, we are 100% sure that they are the same file.

PKI in the context of cybersecurity stands for

public key infrastructure

Which of the following does a digital certificate NOT include? Choose 2

1.Private key of issuer

2.Private key of owner

To verify a signature on a message from Alice, Bob uses _____________.

Alice's public key

Assume Alice and Bob both have public and private keys in a pubic key setting. If Alice wants to send Bob a signed message, Alice first hashes her message and _______ the hash using ______'s ____________ key.

encrypts/Alice/private

Assume Alice and Bob both have public and private keys in a public key setting. If Alice and Bob want to agree on a secret value, then Alice uses her ________________ key and Bob's ____________ key to compute the secret value.

private / public

Assume Alice and Bob both have public and private keys in a public key setting. If Alice wants to send Bob a secret message, Alice encrypts her message using _________________ key and Bob decrypts it using ___________________key.

Bob's public

Bob's private

In cryptanalysis

__________________

is the study of the frequency of letters or groups of letters in a ciphertext.

frequency analysis

In which of these attack scenarios is the attacker most powerful?

Chosen plaintext attack

Which should take place first, authorization or authentication?

authentication