CIS 565 CRYPTOGRAPHY EXAM WITH ANSWERS (2021) STRAYER

CIS 565 CRYPTOGRAPHY EXAM WITH ANSWERS (2021)
STRAYER
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1. An original intelligible message fed into the algorithm as input is known as _________ , while the coded
message produced as output is called the __________ .
2. Division requires that each nonzero element have a(n) __________ inverse.
3. Public-key algorithms are based on __________ .
4. In Advanced Encryption Standard all operations are performed on __________ bytes.
5. A common technique for masking contents of messages or other information traffic so that opponents can not
extract the information from the message is __________ .
6. Joseph Mauborgne proposed an improvement to the Vernam cipher that uses a random key that is as long as
the message so that the key does not need to be repeated. The key is used to encrypt and decrypt a single
message and then is discarded. Each new message requires a new key of the same length as the new
message. This scheme is known as a(n) __________ .
7. If a secret key is to be used as a _________ for conventional encryption a single number must be generated.
8. The __________ cryptosystem is used in some form in a number of standards including DSS and S/MIME.
9. DES exhibits the classic __________ block cipher structure, which consists of a number of identical rounds of
processing.
10. _____________ is the collection of tools, policies, security concepts, security
11. A sequence of plaintext elements is replaced by a __________ of that sequence which
12. Another important mode, XTS-AES, has been standardized by the __________ Security in Storage Working
Group.
13. The AES cipher begins and ends with a(n) _________ stage because any other stage, applied at the beginning
or end, is reversible without knowledge of the key and would add no security.
14. The __________ indicates that the subscriber identified in the certificate has sole control and access to the
private key
15. A public-key encryption scheme has __________ ingredients.
16. _________ is a branch of mathematics that deals with the transformation of data.
17. Plaintext is recovered from the ciphertext using the paired key and _____________ .
18. Public-key encryption is also known as ___________ .
19. A __________ is a set in which you can do addition, subtraction, multiplication and division without leaving the
set.
20. __________ involves the passive capture of a data unit and its subsequent retransmission to produce an
unauthorized effect.
21. ____________ makes use of elliptic curves in which the variables and coefficients
22. A __________ cipher is one in which a block of plaintext is treated as a whole and used to produce a ciphertext
block of equal length.
23. A __________ attack involves trying every possible key until an intelligible translation of the ciphertext is
obtained.
24. The _________ and _________ block cipher modes of operation are used for
25. The Advanced Encryption Standard was published by the __________ in 2001.