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| Section | Objectives |
|---|---|
| Topic 1: Symmetric Encryption | - Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually) |
| Topic 2: Cryptographic Protocols and Applications | - Secure communication design principles - TLS/SSL conceptual overview |
| Topic 3: Hash Functions and Message Authentication | - MAC and HMAC mechanisms - Cryptographic hash functions (e.g., SHA family concepts) |
| Topic 4: Asymmetric Encryption | - Public key cryptography principles - RSA and ECC fundamentals |
| Topic 5: Foundations of Cryptography | - Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles |
| Topic 6: Key Management and PKI | - Certificates, certificate authorities, and PKI structure - Key exchange and lifecycle management |
>> Introduction-to-Cryptography Quizfragen Und Antworten <<
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54. Frage
(How are limits managed for the number of bitcoins that can be created and stored in a blockchain?)
Antwort: A
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.
55. Frage
(Two people want to communicate through secure email. The person creating the email wants to ensure only their friend can decrypt the email. Which key should the person creating the email use to encrypt the message?)
Antwort: A
Begründung:
To ensure confidentiality so that only the intended recipient can decrypt an email, the sender must encrypt in a way that only the recipient can reverse. In public key cryptography, that means encrypting with the recipient's public key. The recipient is the only party who should possess the matching private key, so only they can decrypt the ciphertext. This pattern is fundamental to PKI-based secure email systems such as S/MIME and OpenPGP: the sender looks up or is provided the recipient's certificate/public key, encrypts the message (often by encrypting a randomly generated symmetric session key with the recipient's public key), and the recipient uses their private key to recover the session key and decrypt the content. Encrypting with the sender' s private key would not provide confidentiality; it resembles signing because anyone with the sender's public key could "decrypt" it. Encrypting with a private key of the recipient is also incorrect because private keys are not shared and should never leave the recipient's control. Therefore, the correct key to encrypt the message so only the friend can decrypt it is the recipient's public key.
56. Frage
(What is a component of a one-time password (OTP) that is needed to guess future iterations of passwords?)
Antwort: B
Begründung:
OTP systems (such as HOTP and TOTP) generate a sequence of passwords using a shared secret and a moving factor (counter or time). The critical secret that underpins the ability to compute past or future OTP values is the seed (also called the shared secret key). In HOTP, the seed is used with an HMAC function and an incrementing counter; in TOTP, the seed is used with HMAC and a time-step value. If an attacker obtains the seed and knows the algorithm and moving factor, they can compute future OTPs. The "function" and "encryption algorithm" are typically standardized and public; security relies on keeping the seed secret. An initialization vector is not a standard OTP component in HOTP
/TOTP generation. Therefore, the component needed to predict future OTP values is the seed.
Protecting the seed is essential: it should be stored securely (e.g., hardware token secure storage) and transmitted only through controlled provisioning processes. If compromised, OTP becomes predictable and no longer serves as a strong second factor.
57. Frage
(Which is a primary reason for ethical concerns about encryption?)
Antwort: B
Begründung:
Ethical concerns about encryption commonly arise from the tension between individual privacy/security and societal needs such as law enforcement, national security, and public safety. Strong end-to-end encryption can prevent unauthorized parties from accessing data, including criminals and foreign adversaries, but it can also limit legitimate government access to communications and evidence-even with warrants-because providers may not possess the keys needed to decrypt. This has fueled debates around "going dark," lawful access, and proposals for exceptional access mechanisms or backdoors. Critics argue that weakening encryption for access would create systemic risk, since any intentional vulnerability can be exploited by malicious actors, while proponents emphasize investigative needs in serious cases. Regardless of the stance, the primary ethical concern reflected in policy debates is that encryption complicates government access to information that may be crucial for preventing or investigating crime. The other options do not capture the main ethical controversy: encryption is widely beneficial beyond corporations, and it is not primarily about speed or storage reduction. Therefore, the correct answer is B.
58. Frage
(Which additional input element can be used to implement integrity in combination with symmetric ciphers?)
Antwort: A
Begründung:
Symmetric encryption alone typically provides confidentiality, but it does not automatically provide integrity. Many encryption modes (especially older ones like CBC without authentication) are malleable, meaning an attacker may be able to modify ciphertext and cause predictable changes in plaintext after decryption. To add integrity, systems commonly combine symmetric encryption with a cryptographic hash-based integrity mechanism, such as a hash function used in an HMAC (Hash-based Message Authentication Code) or a dedicated authenticated-encryption mode like GCM that internally uses authentication tags. Among the given options, a hash function is the fundamental additional element that enables integrity checks: it allows construction of a MAC (e.g., HMAC-SHA-256) that the receiver verifies to detect any tampering. An initialization vector and a nonce value are used to ensure uniqueness and randomness properties for encryption but do not, by themselves, guarantee integrity.
An encoding algorithm changes representation, not security. Therefore, the correct additional input element for implementing integrity alongside symmetric encryption is a hash function, typically as part of an HMAC or similar MAC construction.
59. Frage
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