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Important benefit of asymmetrical encryption
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Computer Network Security
- What is the most important benefit of asymmetrical encryption? Contrast
with symmetrical encryption
a. It speeds up the encryption process.
b. It makes e-mail easier to encode.
c. Only the sender knows to whom the information is going.
d. Messages can be transmitted openly and only the receiver can decrypt the
information
- Which part of CAIN is realized through the use of message digest functions
and hashes?
a. confidentiality
b. authenticity
c. integrity
d. non-repudiation
- Code books are normally associated with
a. substitution ciphers
b. Caesar ciphers
c. Spartan scytales
- What defines the strength of a cryptographic method?
a. number of shifts
b. need for a code book
c. complexity of the algorithm
d. length of time needed to crack it
- Cryptography is related to mathematics because _.
a. the functions of mathematics have cryptographic properties
b. logarithms can cause convergence of numbers
c. mathematics is simple and easy to use
d. information can be represented as numbers and manipulated mathematically
- To create a digital signature, a sender needs the plain text, the
asymmetrical encryption algorithm, and _.
a. his/her public key
b. the receiver’s public key
c. his/her private key
d. the receiver’s private key
- One should establish access control policies for each part of the
information system that is __.
a. a high traffic area
b. a high security area
c. a high maintenance area
d. accessible to the public
- If you are attempting to gain access to restricted information, what is the
first thing you should do?
a. kidnap an employee
b. ask for what purpose
c. spoof the server
d. disable the alarm system
- Suppose your spy colleague wanted to send you messages that you could be
sure came from him (and not an enemy trying to pretend to be him). What CAIN
property is that? Your colleague tells you: “Whenever I send you a message,
the last thing in the message will be a number. That number will be a count of
the number of letter E’s in the message. If you get a message, and the number
at the end is NOT an accurate count of the number of letter E’s, that message
is from an imposter.” [a,b,c: 2 points, d: 4 points]
a) This number, put at the end of each message, is an example of what
cryptographic item?
b) Does it have the characteristic of being one wayi.e can you deduce the
original message by knowing the number?
c) Is it collision resistant?
d) Can you suggest some other way to indicate that message is from the sender
without resorting to encryption?
