Introduction-to-Cryptography German, Introduction-to-Cryptography Vorbereitungsfragen

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Objectives
Topic 1: Asymmetric Encryption	- Public key cryptography principles - RSA and ECC fundamentals
Topic 2: Key Management and PKI	- Certificates, certificate authorities, and PKI structure - Key exchange and lifecycle management
Topic 3: Hash Functions and Message Authentication	- MAC and HMAC mechanisms - Cryptographic hash functions (e.g., SHA family concepts)
Topic 4: Foundations of Cryptography	- Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles
Topic 5: Cryptographic Protocols and Applications	- TLS/SSL conceptual overview - Secure communication design principles
Topic 6: Symmetric Encryption	- Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually)

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Introduction-to-Cryptography Vorbereitungsfragen, Introduction-to-Cryptography Deutsche

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WGU Introduction to Cryptography HNO1 Introduction-to-Cryptography Prüfungsfragen mit Lösungen (Q92-Q97):

92. Frage
(Which cryptographic operation has the fastest decryption process?)

A. Asymmetric
B. Padding
C. Hashing
D. Symmetric

Antwort: D

Begründung:
Symmetric cryptography generally provides the fastest encryption and decryption performance among common cryptographic operations. Algorithms like AES and ChaCha20 are designed for high throughput and efficient implementation in software and hardware (e.g., AES-NI acceleration). Symmetric decryption is computationally similar in cost to symmetric encryption, and both are far faster than asymmetric operations for equivalent security levels. Asymmetric cryptography (RSA, ECC) involves expensive mathematical operations (modular exponentiation or elliptic-curve scalar multiplication), making it much slower and unsuitable for bulk data decryption. That is why real-world secure protocols use asymmetric cryptography primarily to authenticate peers and establish keys, then switch to symmetric encryption for the actual data stream. Hashing is not decryption at all; it is one-way, and there is no "decrypt" operation for a hash. Padding is not a decryption mechanism; it is a formatting step used with block ciphers to align plaintext length.
Therefore, the correct choice for the operation with the fastest decryption process is symmetric cryptography.

93. Frage
(What describes how Counter (CTR) mode encryption functions?)

A. Uses an IV to encrypt the first block, then uses the result of the encryption to encrypt the next block
B. Encrypts each block with the same key, where each block is independent of the others
C. Converts the block cipher into a stream cipher, then uses a counter value and a nonce to encrypt the data
D. Uses a self-synchronizing stream cipher where the IV is encrypted and XORed with the data stream one bit at a time

Antwort: C

Begründung:
CTR mode turns a block cipher (like AES) into a stream-like construction by generating a keystream from successive encryptions of a changing input block. Specifically, CTR forms input blocks using a nonce (unique per message) combined with an increasing counter. Each nonce||counter block is encrypted with the block cipher under the shared key, producing a pseudorandom output block. That output is then XORed with plaintext to yield ciphertext (and XORed with ciphertext to recover plaintext). This design enables parallelization (blocks can be generated independently), efficient random access decryption, and avoids chaining dependencies seen in modes like CBC. Option B describes CFB-like behavior; option C describes ECB; option D describes CBC. CTR's security critically depends on never reusing the same nonce/counter sequence with the same key, because reuse would repeat keystream blocks and expose plaintext relationships.
Therefore, the correct description is that CTR converts the block cipher into a stream cipher using a counter value and a nonce.

94. Frage
(How are limits managed for the number of bitcoins that can be created and stored in a blockchain?)

A. A maximum has been established per country
B. Each person has a maximum number
C. Rewards for mining reduce over time
D. The total number of participants has been set

Antwort: C

Begründung:
Bitcoin's supply is controlled by protocol rules enforced by consensus: new bitcoins enter circulation through the block subsidy awarded to miners for producing valid blocks. This subsidy is programmed to halve at fixed intervals (every 210,000 blocks), which steadily reduces the rate of new coin creation over time and asymptotically approaches a capped total supply (commonly cited as 21 million BTC). This mechanism is often called the halving schedule and is the primary way limits are managed. The number of participants is not fixed; anyone can run a node or mine. There is no per-country cap and no per-person maximum enforced by the protocol-addresses and ownership are not limited that way. The supply cap emerges from the decreasing issuance schedule combined with consensus validation rules that reject blocks creating coins beyond what the schedule allows. Therefore, the correct answer is that limits are managed because rewards for mining reduce over time.

95. Frage
(What is a characteristic of Cipher Block Chaining (CBC) mode in cryptography?)

A. It operates on 32-bit blocks.
B. It encrypts each block of plaintext dependent on the previous block.
C. It generates a continuous stream of key material.
D. It requires a different key for each encryption operation.

Antwort: B

Begründung:
CBC mode introduces chaining between blocks to prevent the pattern leakage inherent in ECB. In CBC, each plaintext block is XORed with the previous ciphertext block before being encrypted with the block cipher. For the first block, CBC uses an Initialization Vector (IV) to serve as the "previous ciphertext" input. This makes encryption of each block dependent on the previous block's ciphertext, which is exactly the defining characteristic described in option A. CBC does not generate a continuous stream of key material-that describes stream ciphers or stream-like modes such as CTR/OFB. CBC also does not require a different key per operation; the same symmetric key is reused, while the IV must be fresh/unpredictable to ensure semantic security. The block size is determined by the underlying block cipher (e.g., AES is 128-bit blocks, DES/3DES are 64-bit blocks), not a fixed 32-bit size for CBC itself. Because CBC is not inherently authenticated, best practice is to pair it with a MAC (Encrypt-then-MAC) or use an AEAD mode instead.

96. Frage
(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?)

A. The buyer and the Federal Trade Commission
B. The seller and the buyer
C. The Federal Trade Commission and the cloud provider
D. The cloud provider and the seller

Antwort: B

Begründung:
In a public key infrastructure, trust in a certificate ultimately depends on the relying party's trust anchor set-typically the root CA certificates preinstalled in a customer's browser/OS trust store. For customers to accept the company's certificate as legitimate, the buyer (customer) must trust the root CA public key (or an intermediate chained to it) so they can validate the certificate chain and signatures. The seller (the company) also must trust and rely on the root CA public key to build and present a valid chain and to make operational decisions based on that CA's issuance and revocation mechanisms; practically, the seller selects a CA whose root is widely trusted by customers. The cloud provider's trust is not what makes the certificate valid to customers; the provider may terminate TLS or pass traffic through, but customer validation is based on the chain to a trusted root. Government agencies like the FTC are not part of the cryptographic trust path for TLS certificate validation.
Therefore, among the given options, the correct pairing is the seller and the buyer, reflecting both the issuer selection/usage by the company and the relying-party validation by customers.

97. Frage
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