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WGU Introduction-to-Cryptography Exam Syllabus Topics:

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

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Introduction-to-Cryptography Zertifizierungsfragen, WGU Introduction-to-Cryptography PrüfungFragen

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WGU Introduction to Cryptography HNO1 Introduction-to-Cryptography Prüfungsfragen mit Lösungen (Q22-Q27):

22. Frage
(What is an example of a block cipher mode of operation?)

Antwort: A

Begründung:
A block cipher mode of operation defines how a block cipher (such as AES) is applied to data longer than a single block, and how blocks are linked (or not linked) to provide certain security properties. ECB (Electronic Codebook) is one of the canonical block cipher modes: it encrypts each plaintext block independently using the same key. While ECB is generally discouraged because it leaks patterns (identical plaintext blocks produce identical ciphertext blocks), it is still a valid and historically important mode of operation and is often used as a teaching example of what not to do for structured data. In contrast, SHA-256 is a hash function (one- way digest) and not a mode for block ciphers. DSA is a digital signature algorithm and provides authenticity
/integrity, not encryption mode behavior. RSA is an asymmetric cryptosystem, not a block cipher mode.
Therefore, among the options, ECB is the correct example of a block cipher mode of operation.


23. Frage
(What is the maximum key size (in bits) supported by AES?)

Antwort: C

Begründung:
AES supports three standardized key sizes: 128, 192, and 256 bits, with a fixed block size of 128 bits.
The maximum of these supported key sizes is 256 bits (AES-256). Key size affects resistance to brute- force key search: larger keys exponentially increase the search space. In practice, AES-128 is already considered strong against brute force with contemporary computing capabilities, while AES-256 is often chosen for compliance requirements, conservative security margins, or to hedge against future advances. AES-512 is not part of the AES standard; if 512-bit keys are desired, systems typically use different constructions (like using AES-256 in certain key-derivation or wrapping schemes) rather than changing AES itself. Therefore, the correct maximum supported AES key size is 256 bits.


24. Frage
(Which mechanism can be applied to protect the integrity of plaintext when using AES?)

Antwort: D

Begründung:
AES by itself is a symmetric block cipher that provides confidentiality, but not guaranteed integrity unless used in an authenticated mode. To protect integrity of the plaintext (ensuring it has not been altered), a Message Authentication Code (MAC) can be applied. In the classic Encrypt-then-MAC pattern, the sender encrypts the plaintext with AES and then computes a MAC (often HMAC-SHA-256 or CMAC-AES) over the ciphertext (and relevant headers). The receiver verifies the MAC before attempting decryption, preventing tampering and many padding-oracle style vulnerabilities. Alternatively, AES can be used in an AEAD mode like AES-GCM, which produces an authentication tag serving a similar purpose, but among the listed options the general integrity mechanism is "MAC." RC4 is an unrelated stream cipher and does not provide integrity.
RSA is asymmetric and not the standard integrity add-on for AES-encrypted bulk data. Kerberos is an authentication protocol and key distribution system, not a message integrity primitive. Therefore, to protect plaintext integrity when using AES, the correct mechanism is a Message Authentication Code.


25. Frage
(Which symmetric encryption technique uses a 256-bit key size and a 128-bit block size?)

Antwort: A

Begründung:
AES (Advanced Encryption Standard) is a symmetric block cipher standardized to operate on a fixed
128-bit block size and supports key sizes of 128, 192, and 256 bits. When the key size is 256 bits, the cipher is commonly referred to as AES-256, but the block size remains 128 bits regardless of key length.
This combination (256-bit key, 128-bit block) matches the question precisely. By comparison, DES uses a 64-bit block size with a 56-bit effective key. 3DES also uses a 64-bit block size and effectively applies DES three times, yielding an effective key length typically cited as 112 bits (two-key 3DES) or 168 bits (three-key 3DES), depending on how keys are configured. IDEA uses a 64-bit block size with a 128-bit key. Therefore, the only listed algorithm that supports a 256-bit key while maintaining a 128-bit block size is AES. This is one reason AES is widely adopted for modern symmetric encryption: strong key sizes with efficient implementation and broad standardization.


26. Frage
(Why should a forensic investigator create a hash of a victim's hard drive and of the bitstream copy of the hard drive?)

Antwort: C

Begründung:
In digital forensics, investigators must preserve evidence integrity and demonstrate an unbroken chain of custody. Creating a cryptographic hash (such as SHA-256) of the original drive and then hashing the forensic bitstream image provides a strong mathematical assurance that the copy is an exact, bit-for-bit replica.
Because secure hash functions are designed so that any tiny change in data produces a dramatically different digest, matching hashes indicate the image contains identical data to the source at the time of acquisition. This is critical in legal and investigative contexts: analysis is performed on the copy, not the original, to avoid altering evidence. If the hashes match, the investigator can testify that the evidence examined is identical to what was collected, supporting admissibility and credibility. Hashing does not prove who created files, nor does it directly show whether someone "opened the drive"; it specifically validates the integrity and equivalence of the captured image. Therefore, hashing both artifacts is done to verify that the original and the bitstream copy are identical.


27. Frage
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