WGU D830 Review Question with Verified
Correct Answers
Cryptology
The study of cryptography and cryptanalysis together.
Cryptography
The practice of creating secure communication systems.
Cryptanalysis
The practice of breaking cryptographic systems.
Plaintext
Original readable data before encryption.
Ciphertext
Encrypted, unreadable data.
Key
A secret value used to encrypt or decrypt data.
Cipher
An algorithm used for encryption and decryption.
Encryption
The process of converting plaintext into ciphertext.
Decryption
The process of converting ciphertext back into plaintext.
,Kerckhoffs's Principle
A cryptosystem should be secure even if the algorithm is public; only the key must remain
secret.
Symmetric Cryptography
A type of encryption where the same key is used for encryption and decryption.
Asymmetric Cryptography
A type of encryption that uses a public key and a private key.
Public Key
A key that is shared publicly and used to encrypt data.
Private Key
A secret key used to decrypt data or create digital signatures.
One-Way Function
A function that is easy to compute but difficult to reverse.
Trapdoor Function
A one-way function that can be reversed using secret information.
Caesar Cipher
A substitution cipher that shifts letters by a fixed number.
Substitution Cipher
A cipher that replaces plaintext symbols with other symbols.
Polyalphabetic Cipher
, A cipher that uses multiple substitution alphabets.
Transposition Cipher
A cipher that rearranges plaintext characters without replacing them.
One-Time Pad
A cipher that uses a random key equal in length to the message and used only once.
Confusion
A property that hides the relationship between the key and ciphertext.
Diffusion
A property that spreads plaintext influence across ciphertext.
Block Cipher
A symmetric cipher that encrypts fixed-size blocks of data.
Padding
Extra bits added to fill a block when plaintext is too short.
AES (Advanced Encryption Standard)
A modern symmetric block cipher using 128-bit blocks.
DES (Data Encryption Standard)
A legacy symmetric block cipher using 56-bit keys.
ECB Mode
A block cipher mode that encrypts each block independently (insecure).
CBC Mode
Correct Answers
Cryptology
The study of cryptography and cryptanalysis together.
Cryptography
The practice of creating secure communication systems.
Cryptanalysis
The practice of breaking cryptographic systems.
Plaintext
Original readable data before encryption.
Ciphertext
Encrypted, unreadable data.
Key
A secret value used to encrypt or decrypt data.
Cipher
An algorithm used for encryption and decryption.
Encryption
The process of converting plaintext into ciphertext.
Decryption
The process of converting ciphertext back into plaintext.
,Kerckhoffs's Principle
A cryptosystem should be secure even if the algorithm is public; only the key must remain
secret.
Symmetric Cryptography
A type of encryption where the same key is used for encryption and decryption.
Asymmetric Cryptography
A type of encryption that uses a public key and a private key.
Public Key
A key that is shared publicly and used to encrypt data.
Private Key
A secret key used to decrypt data or create digital signatures.
One-Way Function
A function that is easy to compute but difficult to reverse.
Trapdoor Function
A one-way function that can be reversed using secret information.
Caesar Cipher
A substitution cipher that shifts letters by a fixed number.
Substitution Cipher
A cipher that replaces plaintext symbols with other symbols.
Polyalphabetic Cipher
, A cipher that uses multiple substitution alphabets.
Transposition Cipher
A cipher that rearranges plaintext characters without replacing them.
One-Time Pad
A cipher that uses a random key equal in length to the message and used only once.
Confusion
A property that hides the relationship between the key and ciphertext.
Diffusion
A property that spreads plaintext influence across ciphertext.
Block Cipher
A symmetric cipher that encrypts fixed-size blocks of data.
Padding
Extra bits added to fill a block when plaintext is too short.
AES (Advanced Encryption Standard)
A modern symmetric block cipher using 128-bit blocks.
DES (Data Encryption Standard)
A legacy symmetric block cipher using 56-bit keys.
ECB Mode
A block cipher mode that encrypts each block independently (insecure).
CBC Mode
