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WGU C839 - Introduction to Cryptography Real Exam With Complete Solutions

WGU C839 - Introduction to Cryptography Real Exam With Complete Solutions

WGU C839 - Introduction to Cryptography Real Exam With Complete Solutions




Symmetric Block Cipher
Block Size: 64 bits
Key Size: 128 bits ---------- Correct Answer -------- IDEA (International Data Encryption Algorithm)

Symmetric Block Cipher
Block Size: 64 bit blocks
Key Size: 40 to 128 bits

Two versions: 128 and 256 ---------- Correct Answer -------- CAST 128/256


Symmetric Block Cipher
Block Size: 128 bits
Key Size: 128, 192, or 256 bits
Rounds: 32
Network: Substitution-Permutation ---------- Correct Answer -------- Serpent

Symmetric Block Cipher
Block Size: 64 bits
Key Size: 128 bits ---------- Correct Answer -------- Tiny Encryption Algorithm (TEA)

Deciphering secret writings, kryptos means hidden and grafo means write. Must not be readable by interlopers over secure/hidden communications. Readable by intended recipients only. ---------- Correct Answer -------- Cryptography

Include Ceasar, Atbash, Affine and ROT13 ---------- Correct Answer -------- Mono-Alphabet Substitution Algorithms

Is one of the oldest methods, was used by ancient Romans. Shift of letter. Easy to crack to common words like "A" and "The". ---------- Correct Answer -------- Caeser Cipher

Using common words (A, THE, OO, EE) in English Lang to brute force single substitution ciphers. ---------- Correct Answer -------- Single Substitution Weakness

Hidden message in unrelated text

• The sender and recipient have prearranged to use some pattern, taking certain letters from the message. ---------- Correct Answer -------- Null Cipher

Parties agree on a particular book. Simplest implementation to send coordinates for words ---------- Correct Answer -------- Book Cipher

Widely known Transposition cipher. Plaintext written in columns and transposed in rows. Recipient reconstructs the original message ---------- Correct Answer -------- Rail Fence Cipher

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