Basic Cryptography Study Guide Exam
Questions And All Correct Answers.
After the DES cipher was broken and no longer considered secure, what encryption algorithm was made
as its successor?
A. AES
B. Twofish
C. 3DES
D. RSA - Answer C. 3DES
Data that is in an unencrypted form is referred to as which of the following?
A. crypt text
B. plain text
C. simple text
D. cleartext - Answer D. cleartext
If Bob receives an encrypted reply message from Alice, whose private key is used to decrypt the received
message?
A. Bob's private key.
B. Alice's private key.
C. Bob and Alice's keys.
D. Bob's private key and Alice's public key. - Answer A. Bob's private key.
If using the MD5 hashing algorithm, what is the length to which each message is padded?
A. 32 bits
B. 64 bits
C. 128 bits
D. 512 bits - Answer D. 512 bits
, In cryptography, which of the five basic protections ensures that the information is correct and no
unauthorized person or malicious software has altered that data?
A. confidentiality
B. availability
C. encryption
D. integrity - Answer D. integrity
In which type of encryption is the same key used to encrypt and decrypt data?
A. private
B. public
C. symmetric
D. asymmetric - Answer C. symmetric
The SHA-1 hashing algorithm creates a digest that is how many bits in length?
A. 96 bits
B. 128 bits
C. 160 bits
D. 192 bits - Answer C. 160 bits
The simplest type of stream cipher, one in which one letter or character is exchanged for another, is
known as what?
A. shift
B. substitution
C. lock
D. loop - Answer B. substitution
What alternative term can be used to describe asymmetric cryptographic algorithms?
A. user key cryptography
B. public key cryptography
Questions And All Correct Answers.
After the DES cipher was broken and no longer considered secure, what encryption algorithm was made
as its successor?
A. AES
B. Twofish
C. 3DES
D. RSA - Answer C. 3DES
Data that is in an unencrypted form is referred to as which of the following?
A. crypt text
B. plain text
C. simple text
D. cleartext - Answer D. cleartext
If Bob receives an encrypted reply message from Alice, whose private key is used to decrypt the received
message?
A. Bob's private key.
B. Alice's private key.
C. Bob and Alice's keys.
D. Bob's private key and Alice's public key. - Answer A. Bob's private key.
If using the MD5 hashing algorithm, what is the length to which each message is padded?
A. 32 bits
B. 64 bits
C. 128 bits
D. 512 bits - Answer D. 512 bits
, In cryptography, which of the five basic protections ensures that the information is correct and no
unauthorized person or malicious software has altered that data?
A. confidentiality
B. availability
C. encryption
D. integrity - Answer D. integrity
In which type of encryption is the same key used to encrypt and decrypt data?
A. private
B. public
C. symmetric
D. asymmetric - Answer C. symmetric
The SHA-1 hashing algorithm creates a digest that is how many bits in length?
A. 96 bits
B. 128 bits
C. 160 bits
D. 192 bits - Answer C. 160 bits
The simplest type of stream cipher, one in which one letter or character is exchanged for another, is
known as what?
A. shift
B. substitution
C. lock
D. loop - Answer B. substitution
What alternative term can be used to describe asymmetric cryptographic algorithms?
A. user key cryptography
B. public key cryptography
