BCH 5413 Comprehensive Metabolism
Molecular Biology Review Questions and
Answers Verified Solutions Latest Update
2026/2027
Answer:
A
●● Original, unencrypted information is referred to as ____.
A text
B plaintext
C cleantext
D ciphertext
Answer:
B
●● Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES
Answer:
D
●● In order for User A to send User B an encrypted message that only User B can read, User A
must encrypt message with which of the following keys?
A User A's public key
B User A's private key
C User B's public key
D User B's private key
Answer:
C
●● The greatest weakness with symmetric algorithms is _____.
,A They are less secure than asymmetric
B The problem of key exchange
C They are slower than asymmetric
D The problem of generating keys
Answer:
B
●● Which of the following is generally true about block sizes?
A Smaller block sizes increase security
B Block sizes must be more than 256 bits to be secure
C Block size is irrelevant to security
D Larger block sizes increase security
Answer:
D
●● A _____ is a function that takes a variable-size input m and returns a fixed-size string.
A Symmetric cipher
B Hash
C Asymmetric cipher
D Feistel
Answer:
B
●● Which of the following is a cryptographic protocol that allows two parties to establish a shared
key over an insecure channel?
A Elliptic Curve
B RSA
C MD5
D Diffie-Hellman
Answer:
D
●● A _________ is a digital representation of information that identifies you as a relevant entity
by a trusted third party?
A Digital Signature
B Hash
,C Ownership stamp
D Digest
Answer:
A
●● What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP
Answer:
A
●● DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits
Answer:
A
●● Which of the following is NOT a key size used by AES?
A 512 bits
B 128 bits
C 192 bits
D 256 bits
Answer:
A
●● Which of the following was a multi alphabet cipher widely used from the 16th century (1553)
to the early 20th century (1900s)?
A Vigenere
B Caesar
C Atbash
D Scytale
, Answer:
A
●● Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere
C Scytale
D Atbash
Answer:
D
●● Shifting each letter in the alphabet a fixed number of spaces to the right or left is an example of
what?
A Bit shifting
B Confusion
C Multi substitution
D Single substitution
Answer:
D
●● Which of the following most accurately defines encryption?
A changing a message so it can only be easily read by the intended recipient
B Making binary changes to a message to conceal it
C changing a message using complex mathematics
D Applying keys to plain text
Answer:
A
●● If you use substitution alone, what weakness is present in the resulting cipher text?
A It is the same length as the original text
B It is easily broken with modern computers.
C It is too simple.
D Because it maintains letter and word frequency.
Answer:
D
●● _____ uses at least two different shifts, changing the shift with different letters in the plain
text.
Molecular Biology Review Questions and
Answers Verified Solutions Latest Update
2026/2027
Answer:
A
●● Original, unencrypted information is referred to as ____.
A text
B plaintext
C cleantext
D ciphertext
Answer:
B
●● Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES
Answer:
D
●● In order for User A to send User B an encrypted message that only User B can read, User A
must encrypt message with which of the following keys?
A User A's public key
B User A's private key
C User B's public key
D User B's private key
Answer:
C
●● The greatest weakness with symmetric algorithms is _____.
,A They are less secure than asymmetric
B The problem of key exchange
C They are slower than asymmetric
D The problem of generating keys
Answer:
B
●● Which of the following is generally true about block sizes?
A Smaller block sizes increase security
B Block sizes must be more than 256 bits to be secure
C Block size is irrelevant to security
D Larger block sizes increase security
Answer:
D
●● A _____ is a function that takes a variable-size input m and returns a fixed-size string.
A Symmetric cipher
B Hash
C Asymmetric cipher
D Feistel
Answer:
B
●● Which of the following is a cryptographic protocol that allows two parties to establish a shared
key over an insecure channel?
A Elliptic Curve
B RSA
C MD5
D Diffie-Hellman
Answer:
D
●● A _________ is a digital representation of information that identifies you as a relevant entity
by a trusted third party?
A Digital Signature
B Hash
,C Ownership stamp
D Digest
Answer:
A
●● What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP
Answer:
A
●● DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits
Answer:
A
●● Which of the following is NOT a key size used by AES?
A 512 bits
B 128 bits
C 192 bits
D 256 bits
Answer:
A
●● Which of the following was a multi alphabet cipher widely used from the 16th century (1553)
to the early 20th century (1900s)?
A Vigenere
B Caesar
C Atbash
D Scytale
, Answer:
A
●● Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere
C Scytale
D Atbash
Answer:
D
●● Shifting each letter in the alphabet a fixed number of spaces to the right or left is an example of
what?
A Bit shifting
B Confusion
C Multi substitution
D Single substitution
Answer:
D
●● Which of the following most accurately defines encryption?
A changing a message so it can only be easily read by the intended recipient
B Making binary changes to a message to conceal it
C changing a message using complex mathematics
D Applying keys to plain text
Answer:
A
●● If you use substitution alone, what weakness is present in the resulting cipher text?
A It is the same length as the original text
B It is easily broken with modern computers.
C It is too simple.
D Because it maintains letter and word frequency.
Answer:
D
●● _____ uses at least two different shifts, changing the shift with different letters in the plain
text.
