CCSF CRYPTOGRAPHY TEST

An ecosystem which contains all elements to perform cryptgraphic function is called.....

Cryptosystem

Cryptographic Ecosystem

Secure Encryption System

Protected Key Management Framework

Which of the following determine the strength of an encryption method(Choose all that apply)

An fairly strong algorithm

The secrecy of the key

A short-sized key

The initialization vectors

Match the items on the left with the most approriate description on the right

The range of values that can be used to construct a key.

Key Space

A template containing bit-wise key values which are usually XORed with the plaintext in order to produce a ciphertext

The information that is to be concealed and transmitted

Which cipher type is described in the picture?

One-Time Pad

During steganography, the payload is ...

One-Time Pad

SCENARIO 1: A server needs to communicate with thousands of clients over the internet. Since the server handles financial transaction, there is a regulatory requirement that the communication between the server and the clients must be secured in transit. Given the time-sensitive nature of financial transactions, the IT Security team XYZ company recommends that a symmetric encryption method be used. Hence, a master key is created and stored with the server which creates multiple sub-keys from the master key. You are required to use this scenario to answer all relevant questions that follows.

Using Scanerio 1, What is the mechanisms used by the server to create sub-keys called

Key Initialization

Initialization Vector

Key Derivative Function

Key Initialization Function.

Using Scenario 1, why do you think the IT Security team of XYZ preffered to use symmetric encryption for this scenario

It is more secured

It has smaller key sizes which is easier for the server to handle

The financial transactions are time sensitive

All of the above

The public and private keys of an asymmetric cryptosystem are mathematically related, but if someone gets another person’s public key, she should be able to figure out the corresponding private key.

False

True

If Bob encrypts a message with his private key, choose which security property are rendered

Authentication

Non-repudiation

Integrity

Confidentiality

If Sally encrypts a message with Bob's public key, identify which types of attack can be protected against

Man-in-the-middle

Spoofing attack

Unathorized modification

Unathorized view of the message

Which of the following can be reffered to as 'Secret keys'

Symmetric encryption

Symmetric keys

Asymmetric encryption

Asymmetric keys

CCSF CRYPTOGRAPHY TEST

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