WGU D830 | Questions with 100% Verified Answers | Latest
Update 2026/2027
Question: Cryptology
Answer:
The study of cryptography and cryptanalysis together.
Question: Cryptography
Answer:
The practice of creating secure communication systems.
Question: Cryptanalysis
Answer:
The practice of breaking cryptographic systems.
Question: Plaintext
Answer:
Original readable data before encryption.
Question: Ciphertext
Answer:
Encrypted, unreadable data.
Question: Key
Answer:
A secret value used to encrypt or decrypt data.
Question: Cipher
Answer:
An algorithm used for encryption and decryption.
Question: Encryption
Answer:
The process of converting plaintext into ciphertext.
,Question: Decryption
Answer:
The process of converting ciphertext back into plaintext.
Question: Kerckhoffs's Principle
Answer:
A cryptosystem should be secure even if the algorithm is public; only the key must
remain secret.
Question: Symmetric Cryptography
Answer:
A type of encryption where the same key is used for encryption and decryption.
Question: Asymmetric Cryptography
Answer:
A type of encryption that uses a public key and a private key.
Question: Public Key
Answer:
A key that is shared publicly and used to encrypt data.
Question: Private Key
Answer:
A secret key used to decrypt data or create digital signatures.
Question: One-Way Function
Answer:
A function that is easy to compute but difficult to reverse.
Question: Trapdoor Function
Answer:
A one-way function that can be reversed using secret information.
Question: Caesar Cipher
Answer:
A substitution cipher that shifts letters by a fixed number.
, Question: Substitution Cipher
Answer:
A cipher that replaces plaintext symbols with other symbols.
Question: Polyalphabetic Cipher
Answer:
A cipher that uses multiple substitution alphabets.
Question: Transposition Cipher
Answer:
A cipher that rearranges plaintext characters without replacing them.
Question: One-Time Pad
Answer:
A cipher that uses a random key equal in length to the message and used only once.
Question: Confusion
Answer:
A property that hides the relationship between the key and ciphertext.
Question: Diffusion
Answer:
A property that spreads plaintext influence across ciphertext.
Question: Block Cipher
Answer:
A symmetric cipher that encrypts fixed-size blocks of data.
Question: Padding
Answer:
Extra bits added to fill a block when plaintext is too short.
Question: AES (Advanced Encryption Standard)
Answer:
A modern symmetric block cipher using 128-bit blocks.
Update 2026/2027
Question: Cryptology
Answer:
The study of cryptography and cryptanalysis together.
Question: Cryptography
Answer:
The practice of creating secure communication systems.
Question: Cryptanalysis
Answer:
The practice of breaking cryptographic systems.
Question: Plaintext
Answer:
Original readable data before encryption.
Question: Ciphertext
Answer:
Encrypted, unreadable data.
Question: Key
Answer:
A secret value used to encrypt or decrypt data.
Question: Cipher
Answer:
An algorithm used for encryption and decryption.
Question: Encryption
Answer:
The process of converting plaintext into ciphertext.
,Question: Decryption
Answer:
The process of converting ciphertext back into plaintext.
Question: Kerckhoffs's Principle
Answer:
A cryptosystem should be secure even if the algorithm is public; only the key must
remain secret.
Question: Symmetric Cryptography
Answer:
A type of encryption where the same key is used for encryption and decryption.
Question: Asymmetric Cryptography
Answer:
A type of encryption that uses a public key and a private key.
Question: Public Key
Answer:
A key that is shared publicly and used to encrypt data.
Question: Private Key
Answer:
A secret key used to decrypt data or create digital signatures.
Question: One-Way Function
Answer:
A function that is easy to compute but difficult to reverse.
Question: Trapdoor Function
Answer:
A one-way function that can be reversed using secret information.
Question: Caesar Cipher
Answer:
A substitution cipher that shifts letters by a fixed number.
, Question: Substitution Cipher
Answer:
A cipher that replaces plaintext symbols with other symbols.
Question: Polyalphabetic Cipher
Answer:
A cipher that uses multiple substitution alphabets.
Question: Transposition Cipher
Answer:
A cipher that rearranges plaintext characters without replacing them.
Question: One-Time Pad
Answer:
A cipher that uses a random key equal in length to the message and used only once.
Question: Confusion
Answer:
A property that hides the relationship between the key and ciphertext.
Question: Diffusion
Answer:
A property that spreads plaintext influence across ciphertext.
Question: Block Cipher
Answer:
A symmetric cipher that encrypts fixed-size blocks of data.
Question: Padding
Answer:
Extra bits added to fill a block when plaintext is too short.
Question: AES (Advanced Encryption Standard)
Answer:
A modern symmetric block cipher using 128-bit blocks.
