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WGU Introduction-to-Cryptography Exam Syllabus Topics:

SectionObjectives
Topic 1: Cryptography Fundamentals- Symmetric vs Asymmetric Encryption
- Cryptographic Terminology
- History and Evolution of Cryptography
Topic 2: Applied Cryptography- Cryptographic Best Practices
- SSL/TLS Protocols
- PGP and Email Encryption
- VPN Security
Topic 3: Cryptanalysis and Attacks- Brute Force and Dictionary Attacks
- Common Attack Vectors
- Social Engineering Prevention
Topic 4: Asymmetric Cryptography- Public Key Infrastructure (PKI)
- Diffie-Hellman Key Exchange
- RSA Algorithm
- Elliptic Curve Cryptography (ECC)
Topic 5: Hashing and Digital Signatures- Digital Signature Standards
- Message Authentication Codes (MAC)
- Hash Functions (MD5, SHA-1, SHA-256)
Topic 6: Symmetric Cryptography- Key Management
- Stream Ciphers
- Initialization Vectors (IV)
- Block Ciphers (AES, DES, 3DES)

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WGU Introduction to Cryptography HNO1 Sample Questions (Q49-Q54):

NEW QUESTION # 49
(Which encryption algorithm encrypts with one key, decrypts with another key, and then encrypts with the first key?)

Answer: D

Explanation:
3DES (Triple DES) commonly uses an Encrypt-Decrypt-Encrypt (EDE) sequence. In the two-key form, it encrypts with key K1, decrypts with key K2, then encrypts again with K1. In the three-key form, it encrypts with K1, decrypts with K2, then encrypts with K3. The EDE construction was chosen partly for backward compatibility: if K1=K2=K3, the scheme reduces to single DES, allowing older systems to interoperate in constrained ways. AES and IDEA do not use an EDE triple-stage process as their defining structure; they are single-pass block ciphers with internal rounds. DES is a single-pass algorithm (one key) rather than a triple application with multiple keys. Therefore, the algorithm described-encrypt with one key, decrypt with another, encrypt with the first-is 3DES. Although now considered legacy, it remains a classic example of increasing effective security by applying a block cipher multiple times with independent keys.


NEW QUESTION # 50
(A company wants to use certificates issued by a root CA to demonstrate to customers that it is a legitimate company being hosted by a cloud provider. Who needs to trust the root CA public key?)

Answer: A


NEW QUESTION # 51
(How does adding salt to a password improve security?)

Answer: C

Explanation:
A salt is a unique, random value stored alongside a password hash and combined with the password during hashing. Its main security benefit is that it ensures identical passwords do not produce identical hashes across different accounts or systems. If two users choose the same password, their stored hashes will differ because their salts differ, which directly prevents attackers from spotting shared passwords by comparing hashes. Salts also defeat precomputation attacks such as rainbow tables, because an attacker would need to regenerate tables for each possible salt value-a task that becomes infeasible when salts are large and unique per password. Salt does not enforce password complexity rules (that's a policy/validation function), does not guarantee users choose different passwords, and does not prevent password reuse across sites. The correct statement is that salt makes the resulting hash different even for the same password, improving resistance to offline cracking at scale and eliminating the "same hash
= same password" shortcut attackers rely on.


NEW QUESTION # 52
(A security analyst uses a polyalphabetic substitution cipher with a keyword of YELLOW to encrypt a message. Which cipher should be used to encrypt the message?)

Answer: C

Explanation:
A polyalphabetic substitution cipher uses multiple substitution alphabets rather than a single fixed mapping.
The classic cipher that uses a keyword to select shifting alphabets across the message is the Vigenere cipher.
In Vigenere, each plaintext letter is shifted by an amount determined by the corresponding key letter (repeating the keyword as needed). For example, a keyword like "YELLOW" is aligned under the plaintext; each key character defines a Caesar shift (A=0, B=1, ...) applied to the plaintext character, producing ciphertext. This rotation of alphabets across positions makes Vigenere more resistant to simple frequency analysis than monoalphabetic substitution, because the same plaintext letter may encrypt to different ciphertext letters depending on its position relative to the key. The Pigpen cipher is a symbol substitution cipher, Caesar is monoalphabetic with a single shift, and Playfair is a digraph substitution cipher using a 5×5 key square, not the repeating-key polyalphabetic method described. Therefore, the correct cipher is Vigenere.


NEW QUESTION # 53
(What is an attribute of RC4 when used with WEP?)

Answer: B

Explanation:
In classic WEP deployments, RC4 was used with what is commonly called "40-bit WEP" (also labeled
"64-bit WEP" because it combines a 40-bit secret key with a 24-bit IV to form a 64-bit RC4 seed). The key attribute emphasized in many foundational descriptions of WEP is this 40-bit shared secret length, which was originally chosen due to export restrictions and legacy constraints. Although "104-bit WEP" (sometimes called "128-bit WEP," again counting the 24-bit IV) also existed, the option set here points to the historically standard and widely referenced attribute: a 40-bit key when RC4 is used in WEP.
Importantly, WEP's security failure is not only about key size; the 24-bit IV is too small and repeats frequently, and WEP's key scheduling vulnerabilities combined with IV reuse allow attackers to recover the secret key with enough captured frames. Still, among the given options, the correct attribute is the 40-bit key.


NEW QUESTION # 54
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