Wgu D200 Exam A+ Grade Assured Complete Solutions And Verified Answers

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Exam Solution
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WGU D830 2026 A+ GRADE ASSURED COMPLETE SOLU
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TIONS AND VERIFIED ANSWERS (5251D)
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QUESTION 1 +t




Cryptology
ANSWER

The study of cryptography and cryptanalysis together.
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QUESTION 2 +t




Cryptography
ANSWER

The practice of creating secure communication systems.
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QUESTION 3 +t




Cryptanalysis
ANSWER

The practice of breaking cryptographic systems.
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QUESTION 4 +t




Plaintext
ANSWER

Original readable data before encryption.
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QUESTION 5 +t

,Ciphertext
ANSWER

Encrypted, unreadable data. +t +t




QUESTION 6 +t




Key
ANSWER

A secret value used to encrypt or decrypt data.
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QUESTION 7 +t




Cipher
ANSWER

An algorithm used for encryption and decryption.
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QUESTION 8 +t




Decryption
ANSWER

The process of converting ciphertext back into plaintext.
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QUESTION 9 +t




Kerckhoffs's Principle +t




ANSWER

A cryptosystem should be secure even if the algorithm is public; only the key must remain secret.
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QUESTION 10 +t




Symmetric Cryptography +t




ANSWER

A type of encryption where the same key is used for encryption and decryption.
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QUESTION 11 +t

,Asymmetric Cryptography +t




ANSWER

A type of encryption that uses a public key and a private key.
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QUESTION 12 +t




Public Key +t




ANSWER

A key that is shared publicly and used to encrypt data.
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QUESTION 13 +t




Private Key +t




ANSWER

A secret key used to decrypt data or create digital signatures.
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QUESTION 14 +t




One-Way Function +t




ANSWER

A function that is easy to compute but difficult to reverse.
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QUESTION 15 +t




Trapdoor Function +t




ANSWER

A one-way function that can be reversed using secret information.
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QUESTION 16 +t




Caesar Cipher +t




ANSWER

A substitution cipher that shifts letters by a fixed number.
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QUESTION 17 +t

, Substitution Cipher +t




ANSWER

A cipher that replaces plaintext symbols with other symbols.
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QUESTION 18
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Polyalphabetic Cipher +t




ANSWER

A cipher that uses multiple substitution alphabets.
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QUESTION 19
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Transposition Cipher +t




ANSWER

A cipher that rearranges plaintext characters without replacing them.
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QUESTION 20
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One-Time Pad +t




ANSWER

A cipher that uses a random key equal in length to the message and used only once.
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QUESTION 21
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Confusion
ANSWER

A property that hides the relationship between the key and ciphertext.
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QUESTION 22
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Diffusion
ANSWER

A property that spreads plaintext influence across ciphertext.
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QUESTION 23
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