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| Section | Objectives |
|---|---|
| Cryptanalysis and Attacks | - Brute Force and Dictionary Attacks - Common Attack Vectors - Social Engineering Prevention |
| Symmetric Cryptography | - Key Management - Stream Ciphers - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) |
| Cryptography Fundamentals | - History and Evolution of Cryptography - Cryptographic Terminology - Symmetric vs Asymmetric Encryption |
| Asymmetric Cryptography | - Public Key Infrastructure (PKI) - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange - RSA Algorithm |
| Hashing and Digital Signatures | - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) |
| Applied Cryptography | - SSL/TLS Protocols - Cryptographic Best Practices - PGP and Email Encryption - VPN Security |
>> Introduction-to-Cryptography Prüfungsübungen <<
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24. Frage
(Which encryption process sends a list of cipher suites that are supported for encrypted communications?)
Antwort: D
Begründung:
In the TLS handshake, the ClientHello message is the client's opening negotiation message and includes the client's supported cryptographic capabilities. A key part of ClientHello is the offered cipher suites list, which advertises combinations of key exchange, authentication, encryption, and integrity/AEAD algorithms the client is willing to use. The server responds with ServerHello, selecting one of the offered cipher suites (in TLS 1.2 and earlier) and confirming protocol parameters. Forward secrecy is a property achieved by using ephemeral key exchange (e.g., (EC)DHE), not a specific message that "sends a list." "Integrity check" is a security goal/mechanism, not the negotiation step. While TLS 1.3 changes the structure of negotiation (cipher suite list still appears in ClientHello but only covers AEAD and hash; key exchange is negotiated via extensions), the fundamental idea remains: the client proposes supported cipher suites in ClientHello, and the server picks compatible parameters. Therefore, the process that sends the list of supported cipher suites is the ClientHello.
25. 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?)
Antwort: A
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.
26. Frage
(What is an alternative to using a Certificate Revocation List (CRL) with certificates?)
Antwort: C
Begründung:
OCSP is the primary online alternative to CRLs for checking whether a certificate has been revoked.
With a CRL, a relying party periodically downloads a list of revoked certificate serial numbers published by the issuing CA (or CRL distribution point). That approach can be bandwidth-heavy, introduces latency between revocation and client awareness, and can result in clients using stale revocation data if updates are infrequent. OCSP improves this by allowing a client (or a server on the client's behalf) to query an OCSP responder in near real time about the status of a specific certificate (good, revoked, or unknown). In practice, many TLS deployments use OCSP stapling, where the server periodically fetches a signed OCSP response from the CA's responder and "staples" it to the TLS handshake, reducing client-side network calls and improving privacy (the CA doesn't learn which site the client is visiting). Thus, OCSP provides a more timely, certificate-specific revocation status mechanism than CRLs while preserving the CA's signed assurance.
27. Frage
(Which encryption mode is known for supporting parallel processing?)
Antwort: B
Begründung:
ECB (Electronic Codebook) mode encrypts each block independently with the same key, which makes it naturally amenable to parallel processing: multiple blocks can be encrypted or decrypted simultaneously because there is no chaining dependency between blocks. This is in contrast to CBC encryption, where each plaintext block is XORed with the previous ciphertext block, creating a dependency that prevents straightforward parallelization of encryption (though CBC decryption can be parallelized because ciphertext blocks are already known). Feedback modes like CFB and OFB generate keystream material sequentially, where each step depends on the previous state, limiting parallelism. While ECB's parallelism is an implementation advantage, it is widely discouraged for most real data because it leaks patterns-identical plaintext blocks produce identical ciphertext blocks. Modern systems prefer parallel-friendly and secure modes such as CTR or GCM, but among the listed options, the mode most known for parallel processing is ECB due to block independence. Therefore, the correct answer is Electronic Codebook (ECB).
28. Frage
(Which wireless security standard uses an authentication server with 802.1X and EAP?)
Antwort: C
Begründung:
802.1X is a port-based network access control framework that enables centralized authentication using an authentication server (commonly RADIUS). EAP (Extensible Authentication Protocol) runs within 802.1X to support many credential types (password-based methods like PEAP, certificate-based methods like EAP-TLS, and others). WPA-Enterprise is the wireless security mode that explicitly uses 802.1X + EAP with an authentication server to perform per-user/per-device authentication and to derive dynamic session keys. By contrast, WPA-PSK uses a pre-shared key without an external authentication server; all users share the same PSK, which is weaker for enterprise identity management. WEP is an older mechanism using static keys and does not provide modern 802.1X/EAP enterprise authentication in the WPA-Enterprise sense. TKIP is an encryption/integrity protocol used under WPA, not the full authentication "standard" involving an authentication server. Therefore, the correct choice is WPA-Enterprise.
29. Frage
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