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WGU C836 OA STUDY GUIDE (OVERLY
INFORMATIVE) | FREQUENTLY TESTED
QUESTIONS WITH CORRECT ANSWERS |
BRAND NEW!
CIA Triad - ✔✔✔ CORRECT Answer > Confidentiality, Integrity,
Availability
Nessus - ✔✔✔ CORRECT Answer > Vulnerability scanning tool
Caesar Cypher - ✔✔✔ CORRECT Answer > letter-by-letter method to
make a cipher. For each letter, substitute another letter 4 letters
ahead. For "a", write "d".
Cryptographic Machines - ✔✔✔ CORRECT Answer > 1. The Jefferson
Disk by Thomas Jefferson
2. The Enigma by Arthur Scherbius
Kerckhoffs' Principle - ✔✔✔ CORRECT Answer > 1. The system must be
substantial, if not mathematically, undecipherable.
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2. The system must not require secrecy and can be stolen by the
enemy without causing trouble.
3. It must be easy to communicate and remember the keys
without requiring written notes, and it must be easy to change or
modify the keys with different participants.
4. The system ought to be compatible with telegraph
communication.
5. The system must be portable, and its use must not require
more than one person.
6. Finally, regarding the circumstances in which such system is
applied, it must be easy to use and must require neither the
stress of mind nor the knowledge of a long series of rules.
Symmetric Cryptography - ✔✔✔ CORRECT Answer > Encryption that
uses a single key to encrypt and decrypt a message.
Block Cipher - ✔✔✔ CORRECT Answer > Takes a predetermined number
of bits, known as a block, in the plaintext message and encrypts
that block
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Stream Cipher - ✔✔✔ CORRECT Answer > Encrypts each bit in the
plaintext message, 1 bit at a time
Symmetric Key Algorithms - ✔✔✔ CORRECT Answer > DES
3DES
and
AES
Symmetric Key Algorithms: DES - ✔✔✔ CORRECT Answer > A block
cipher based on symmetric key cryptography and uses a 56-bit
key. Not that secured any more.
Symmetric Key Algorithms: AES - ✔✔✔ CORRECT Answer > Uses three
different ciphers: one with a 128-bit key, one with a 192-bit key,
and one with a 256-bit key, all having a block length of 128 bits
Asymmetric Cryptography - ✔✔✔ CORRECT Answer > Utilizes two keys:
a public key and a private key. The public key is used to encrypt
data sent from the sender to the receiver and is shared with
everyone. Private keys are used to decrypt data that arrives at
the receiving end and are very carefully guarded by the receive
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Asymmetric Key Algorithms - ✔✔✔ CORRECT Answer > 1. Secure
Sockets Layer (RSA) by Ron Rivest, Adi Shamir, and Leonard
Adleman
2. Elliptic Curve Cryptography (ECC) - can secure all browser
connections to the Web servers
3. ElGamal
4. Diffie-Hellman
5. DSS
6. Pretty Good Privacy (PGP)
7. Transport Layer Security (TLS)
8. Voice over IP (VoIP)
Hash Function - ✔✔✔ CORRECT Answer > Create a largely unique and
fixed-length hash value based on the original message
WGU C836 OA STUDY GUIDE (OVERLY
INFORMATIVE) | FREQUENTLY TESTED
QUESTIONS WITH CORRECT ANSWERS |
BRAND NEW!
CIA Triad - ✔✔✔ CORRECT Answer > Confidentiality, Integrity,
Availability
Nessus - ✔✔✔ CORRECT Answer > Vulnerability scanning tool
Caesar Cypher - ✔✔✔ CORRECT Answer > letter-by-letter method to
make a cipher. For each letter, substitute another letter 4 letters
ahead. For "a", write "d".
Cryptographic Machines - ✔✔✔ CORRECT Answer > 1. The Jefferson
Disk by Thomas Jefferson
2. The Enigma by Arthur Scherbius
Kerckhoffs' Principle - ✔✔✔ CORRECT Answer > 1. The system must be
substantial, if not mathematically, undecipherable.
,Page 2 of 33
2. The system must not require secrecy and can be stolen by the
enemy without causing trouble.
3. It must be easy to communicate and remember the keys
without requiring written notes, and it must be easy to change or
modify the keys with different participants.
4. The system ought to be compatible with telegraph
communication.
5. The system must be portable, and its use must not require
more than one person.
6. Finally, regarding the circumstances in which such system is
applied, it must be easy to use and must require neither the
stress of mind nor the knowledge of a long series of rules.
Symmetric Cryptography - ✔✔✔ CORRECT Answer > Encryption that
uses a single key to encrypt and decrypt a message.
Block Cipher - ✔✔✔ CORRECT Answer > Takes a predetermined number
of bits, known as a block, in the plaintext message and encrypts
that block
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Stream Cipher - ✔✔✔ CORRECT Answer > Encrypts each bit in the
plaintext message, 1 bit at a time
Symmetric Key Algorithms - ✔✔✔ CORRECT Answer > DES
3DES
and
AES
Symmetric Key Algorithms: DES - ✔✔✔ CORRECT Answer > A block
cipher based on symmetric key cryptography and uses a 56-bit
key. Not that secured any more.
Symmetric Key Algorithms: AES - ✔✔✔ CORRECT Answer > Uses three
different ciphers: one with a 128-bit key, one with a 192-bit key,
and one with a 256-bit key, all having a block length of 128 bits
Asymmetric Cryptography - ✔✔✔ CORRECT Answer > Utilizes two keys:
a public key and a private key. The public key is used to encrypt
data sent from the sender to the receiver and is shared with
everyone. Private keys are used to decrypt data that arrives at
the receiving end and are very carefully guarded by the receive
, Page 4 of 33
Asymmetric Key Algorithms - ✔✔✔ CORRECT Answer > 1. Secure
Sockets Layer (RSA) by Ron Rivest, Adi Shamir, and Leonard
Adleman
2. Elliptic Curve Cryptography (ECC) - can secure all browser
connections to the Web servers
3. ElGamal
4. Diffie-Hellman
5. DSS
6. Pretty Good Privacy (PGP)
7. Transport Layer Security (TLS)
8. Voice over IP (VoIP)
Hash Function - ✔✔✔ CORRECT Answer > Create a largely unique and
fixed-length hash value based on the original message
