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| Section | Objectives |
|---|---|
| Topic 1: Applied Cryptography | - VPN Security - Cryptographic Best Practices - PGP and Email Encryption - SSL/TLS Protocols |
| Topic 2: Cryptanalysis and Attacks | - Common Attack Vectors - Brute Force and Dictionary Attacks - Social Engineering Prevention |
| Topic 3: Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) - Digital Signature Standards |
| Topic 4: Asymmetric Cryptography | - Public Key Infrastructure (PKI) - Elliptic Curve Cryptography (ECC) - RSA Algorithm - Diffie-Hellman Key Exchange |
| Topic 5: Symmetric Cryptography | - Stream Ciphers - Key Management - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV) |
| Topic 6: Cryptography Fundamentals | - Cryptographic Terminology - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption |
>> Introduction-to-Cryptography Exam <<
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56. Frage
(Which operation can be performed on a certificate during the "Issued" stage?)
Antwort: C
Begründung:
The "Issued" stage in a certificate lifecycle indicates that the certificate has been generated and signed by the issuing CA and is now valid for use (subject to validity dates, policy constraints, and revocation status). At this point, the operational focus shifts from creating the certificate to making it available to the subject and relying parties. "Distribution" is the lifecycle activity most directly associated with an issued certificate: installing it on servers or endpoints, provisioning it into keystores, publishing it to directories if required, and ensuring the chain (intermediates) is accessible for validation. By contrast,
"Creation" is earlier in the process (key generation, CSR creation, identity validation, issuance
/signing). "Key recovery" and "key archiving" relate to private key management and escrow policies (often for encryption keys, not signing keys), and are governed by organizational policy and key management systems rather than the certificate's issued state itself. A certificate can be distributed after issuance regardless of whether any key escrow features exist. Therefore, the operation that fits the certificate's "Issued" stage best is distribution of the issued credential for operational use.
57. Frage
(Which feature is characteristic of asymmetric encryption?)
Antwort: D
Begründung:
Asymmetric encryption is defined by using a key pair: a public key that can be shared widely and a private key that remains secret to its owner. The keys are mathematically related so that data encrypted with one key can be decrypted with the other (in confidentiality use cases, encryption with the recipient's public key and decryption with the recipient's private key). This design solves key distribution challenges: anyone can encrypt to a recipient without first sharing a secret key securely. It also enables digital signatures, where the private key signs and the public key verifies-supporting authenticity and integrity. Option B describes symmetric cryptography, not asymmetric. Option C is not a defining property; both symmetric and asymmetric algorithms can involve rounds or repeated operations. Option D is incorrect because asymmetric encryption is reversible for the intended holder of the private key; "irreversible" describes hashing, not encryption. Therefore, the characteristic feature of asymmetric encryption is the use of both a public and private key.
58. Frage
(Why is lightweight cryptography important in modern information security?)
Antwort: D
Begründung:
Lightweight cryptography is important because many modern systems operate in constrained environments- IoT sensors, embedded controllers, wearables, and mobile devices-where CPU, memory, storage, bandwidth, and battery power are limited. Traditional "heavy" cryptographic suites may be too slow, too energy-intensive, or too large in code footprint for these platforms, leading to insecure workarounds or disabling security entirely. Lightweight cryptographic primitives and profiles are designed to deliver strong security properties (confidentiality and integrity, often via AEAD) while fitting within tight resource budgets and real-time constraints. This is essential as IoT and mobile ecosystems expand, increasing the attack surface and the consequences of compromised devices (botnets, surveillance, physical safety risks). Lightweight cryptography is not meant to "limit encryption tools" or complicate protection; it enables practical, deployable security where otherwise implementations might be weak or absent. High-speed network communication can benefit from efficient crypto too, but the defining modern driver is constrained-device security. Therefore, the correct reason is addressing the security needs of IoT devices and mobile applications.
59. Frage
(What is the RC4 encryption key size when utilizing WPA with Temporal Key Integrity Protocol (TKIP)?)
Antwort: B
Begründung:
WPA with TKIP was designed as an interim improvement over WEP while still using the RC4 stream cipher for compatibility with legacy hardware. TKIP addresses WEP's major weaknesses by introducing per-packet key mixing, a message integrity mechanism ("Michael"), and replay protection. In TKIP, the encryption key used with RC4 is 128 bits. Practically, TKIP derives a per-packet RC4 key from a 128-bit temporal key (TK), the transmitter's MAC address, and a sequence counter (TKIP Sequence Counter, TSC) to avoid the simple IV reuse patterns that made WEP easy to break. Even with these improvements, TKIP has known weaknesses and is deprecated in favor of WPA2/WPA3 using AES-based CCMP/GCMP. But strictly for the question asked, TKIP's RC4 keying material is based on a 128-bit key size, not 40/56-bit legacy sizes and not 256-bit.
60. Frage
(An administrator has configured a Virtual Private Network (VPN) connection utilizing IPsec transport mode with Encapsulating Security Payload (ESP) between a server in the corporate office and a client computer in the remote office. In which situation can the packet content be inspected?)
Antwort: C
Begründung:
With IPsec ESP in transport mode, the payload of the original IP packet (typically the transport-layer segment and higher) is encrypted and integrity-protected between the two endpoints-here, the corporate server and the remote client. Because encryption is applied by the sending endpoint and removed only by the receiving endpoint, intermediate routers, switches, and monitoring devices in either network cannot view the protected payload while it is in transit. They may see outer IP headers and certain metadata needed for routing, but not the encrypted content protected by ESP. As a result, the packet's contents are inspectable only at the endpoints: before encryption on the sender (plaintext exists in memory/stack before IPsec processing) and after decryption on the receiver (plaintext is restored for the application). This is true whether the traffic traverses internal networks or the Internet; the cryptographic boundary is between the endpoints participating in the IPsec SA. Therefore, inspection of the actual content is possible only on the devices at headquarters and offsite, before sending and after receiving, not by in-transit networks.
61. Frage
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