The Crypto Control Toolbox

In the context of digital encryption of a message, what is a private key?

Any key used for encryption

A key to a private file

An encryption key known only to the receiver of a message

An encryption key known only to the sender of a message

Which of the following techniques is NOT needed for a digital signature?

A blockchain

A hash function

A time stamp

A PKI

What is encryption?

Replacing words with other words

Turning a message into Morse code

A method of keeping messages secret that uses an Enigma machine

Replacing characters in a message with other characters to make it unreadable without decryption

Which is an advantage of a Zero Knowledge Proof for checking someone is who they say they are?

No need for the user to divulge their password when proving they have it

No need for a PKI

Does not require users to have any knowledge of computers

Easy to understand how the proof works

What does PKI stand for?

Public Knowledge Initiation

Private Key Infrastructure

Private Knowledge Initiative

Public Key Infrastructure

What does a document time-stamping service do?

Proves that a document was written by a particular author

Distributes copies of a document to multiple people at a pre-specified time

Provides a version of the document with a watermark added showing the time

Provides tamper-resistent, independent evidence that a person had a document at a particular time

Which are the control objectives that the 'crypto control toolbox' techniques best support?

Speed and economy

Availability and secrecy

Speed and secrecy

Secrecy and proof

If you had to leave a computer file of sensitive information with someone you did not trust, which of these combinations of techniques would be most suitable?

A Zero Knowledge Proof and a password

Hashing and encryption

Encryption and a Mutual Distributed Ledger

Encryption and a blockchain

Which of the following statements about good hash functions is not true?

The hash is typically shorter than the file or message it is created from

The hash is unique to that file or message. ie. no other file or message can have the same hash value

The hash must contain at least one '#' character

It is extremely difficult to change a file in such a way that its correct hash is not changed

Where a Mutual Distributed Ledger is used, with 128 participants, each with one participating database, how many times is each data item recorded across the whole system?

7 times because 2 to the power of 7 = 128

Unknown - it depends what level of redundancy has been set for the system

128

1 time

The Crypto Control Toolbox

In the context of digital encryption of a message, what is a private key?

Which of the following techniques is NOT needed for a digital signature?

What is encryption?

Which is an advantage of a Zero Knowledge Proof for checking someone is who they say they are?

What does PKI stand for?

What does a document time-stamping service do?

Which are the control objectives that the 'crypto control toolbox' techniques best support?

If you had to leave a computer file of sensitive information with someone you did not trust, which of these combinations of techniques would be most suitable?

Which of the following statements about good hash functions is not true?

Where a Mutual Distributed Ledger is used, with 128 participants, each with one participating database, how many times is each data item recorded across the whole system?

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