The Crypto Control Toolbox

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

An encryption key known only to the sender of a message

An encryption key known only to the receiver of a message

Any key used for encryption

A key to a private file

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

A time stamp

A blockchain

A PKI

A hash function

What is encryption?

Replacing words with other words

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

A method of keeping messages secret that uses an Enigma machine

Turning a message into Morse code

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

Easy to understand how the proof works

No need for a PKI

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

Does not require users to have any knowledge of computers

What does PKI stand for?

Public Knowledge Initiation

Public Key Infrastructure

Private Knowledge Initiative

Private Key Infrastructure

What does a document time-stamping service do?

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

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

Proves that a document was written by a particular author

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

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

Availability and secrecy

Speed and secrecy

Speed and economy

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?

Encryption and a Mutual Distributed Ledger

A Zero Knowledge Proof and a password

Hashing and encryption

Encryption and a blockchain

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

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

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

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

1 time

128

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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