ITN 262 Chapter 8 Test Questions with All Correct Answers
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Course
ITN 262
Institution
ITN 262
ITN 262 Chapter 8 Test Questions with All Correct Answers
The simplest technique for key wrapping is called _____ ________. It uses xor to perform the wrapping. - Answer- key splitting.
In ____ ________, the ideal KEK is not constructed from a passphrase. Both the CEK and KEK should be generat...
ITN 262 Chapter 8 Test Questions
with All Correct Answers
The simplest technique for key wrapping is called _____ ________. It uses xor to
perform the wrapping. - Answer- key splitting.
In ____ ________, the ideal KEK is not constructed from a passphrase. Both the CEK
and KEK should be generated from a truly random source. - Answer- key splitting
When we wrap keys, we perform two completely separate encryptions. The first
encryption protects the data by using CEK. The second encryption protects the ____ by
using the _____. - Answer- CEK, KEK
We often have cases where we cant allow a person to act alone and take serious
action. The general solution is to break the action into steps that no single person can
take independently. This is called? - Answer- Separation of Duty
When we encrypt with a secret-key algorithm, the security resides in the key, and our
data remains secret if our key remains secret. We often call this __________________.
- Answer- secret-key cryptography.
With _____-________ _______, clever mathematics allows us to share a crypto key
publicly and still keep information safe. - Answer- public-key cryptography
PKI
When the sender uses the public key, the recipient must use the ________ _____. -
Answer- private key
PKI
we create the private key first. We derive the public key from the ______ ____. -
Answer- private key
The asymmetry in public-key cryptography allows us to produce ____ ______. -
Answer- digital signatures
Alice can use her private key to encrypt some information; the ciphertext yields the
digital signature. Anyone with Alice's _________ key can decrypt one of Alice's
signatures and verify that her personal, private key had encrypted it. - Answer- public
, Each user may have a unique private key; only the corresponding public key works with
a given private key. - Answer- Asymmetric
All public-key algorithms rely on a mathematical trick. The algorithms use mathematical
functions that are relatively easy to calculate but very difficult to _______. - Answer-
invert
We often form the private key from one or two very large prime numbers. We form the
______ ____ by calculating a result from those prime numbers. - Answer- public key
"prime factors" ~ All integers are either prime numbers or they are composite numbers
made up of two or more primes. If we have a list of prime factors in a number (e.g.,
2,3,5, and 11), it's straightforward to multiply them together to yield 330. On the other
hand, it takes many more computational steps- and a more subtle procedure- to undo
the multiplications and retrieve the Primes. this is the basis of many ____-__
techniques. - Answer- public-key
Asymmetric algorithms fit into categories according to the __________ they use, but in
practice, we use the names of the prevailing algorithms. - Answer- mathematics
-Diffie-Hellman - products of exponents.
-Rivest-Shamir-Adleman - modular inverses
-Elliptic curves
-Others-Knapsack etc.
These are examples of what? - Answer- Asymmetric
Modern systems use public keys to wrap secret keys and to construct _______
________. - Answer- digital signatures
- Each participant multiplies their own private key by the other's public key to compute
the shared secret.
- Lets two endpoints share a single secret value without sending any secrets back and
forth.
- doesn't actually encrypt information, it provides a shared secret.
- people usually don't use for long-term public keys.
- Have at least 10 times as many bits as symmetric keys to provide comparable
resistance to trial-and-error attacks.
This is called? - Answer- Diffie-Hellman
If an attacker manages to recover one of the system's keys and that key provides no
information that helps crack future keys, then the system has ____ _____ _____.
- If two endpoints generate a new set of Diffie-Hellman key pairs to establish a new,
shared secret key, then the system has _____ _____ ________. - Answer- perfect
forward secrecy.
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