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

A key to a private file

Any key used for encryption

An encryption key known only to the receiver of a message

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

A hash function

A PKI

A time stamp

A blockchain

What is encryption?

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

Replacing words with other words

Turning a message into Morse code

A method of keeping messages secret that uses an Enigma machine

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

Does not require users to have any knowledge of computers

No need for a PKI

Easy to understand how the proof works

What does PKI stand for?

Private Knowledge Initiative

Private Key Infrastructure

Public Key Infrastructure

Public Knowledge Initiation

What does a document time-stamping service do?

Proves that a document was written by a particular author

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

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

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

Secrecy and proof

Speed and economy

Speed and secrecy

Availability and secrecy

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

Encryption and a blockchain

Hashing and encryption

A Zero Knowledge Proof and a password

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

The hash must contain at least one '#' character

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

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

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

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?

128

1 time

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

7 times because 2 to the power of 7 = 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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