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| Section | Weight | Objectives |
|---|---|---|
| Hash Functions & Data Integrity | 15% | - Uses: integrity checks, password storage, message authentication - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - HMAC construction and application - Properties: collision resistance, one-way function |
| Cryptography Fundamentals | 20% | - Basic terminology: plaintext, ciphertext, algorithm, key - Core goals: confidentiality, integrity, authentication, non-repudiation - Historical evolution and modern applications |
| Asymmetric Encryption & Public Key Infrastructure | 25% | - Algorithms: RSA, ECC, Diffie-Hellman - Certificate lifecycle: creation, validation, revocation - PKI components: certificates, CAs, trust models - Principles: public/private key pairs - Digital signatures: purpose and process |
| Implementation & Best Practices | 5% | - Selecting appropriate algorithms and key sizes - Standards and compliance - Common mistakes and vulnerabilities |
| Key Management & Secure Protocols | 10% | - Key generation, storage, exchange, and destruction - Cryptographic attacks: brute force, birthday, man-in-the-middle - Secure protocols: TLS/SSL, IPsec, SSH, PGP |
| Symmetric Encryption | 25% | - Algorithms: AES, DES, 3DES, Blowfish - Key generation, distribution, and management challenges - Principles and operation - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) |
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NEW QUESTION # 61
(Which type of encryption is Advanced Encryption Standard (AES) considered to be?)
Answer: C
Explanation:
AES is a symmetric-key block cipher, meaning the same shared secret key is used for both encryption and decryption. It operates on fixed-size 128-bit blocks and supports key sizes of 128, 192, and 256 bits. Being symmetric, AES is efficient and well-suited for encrypting large volumes of data-files, disk encryption, VPN payloads, and bulk traffic in protocols like TLS once a session key is established. AES is not "hybrid" by itself; hybrid encryption refers to combining asymmetric cryptography (for key exchange or key wrapping) with symmetric cryptography (for bulk data encryption), and AES often plays the symmetric part of that hybrid design. It is not "quantum encryption," which is a separate, loosely used term sometimes referring to quantum key distribution or quantum-resistant algorithms. AES is also not asymmetric; it does not use public
/private key pairs. Therefore, AES is correctly classified as symmetric encryption, matching option D.
NEW QUESTION # 62
(A security engineer is implementing device authentication as a form of two-factor authentication in a Public Key Infrastructure (PKI) environment. What should be used as a second form of authentication?)
Answer: B
Explanation:
In a PKI environment, a digital certificate is the standard credential used to bind an identity (user, device, service) to a public key, with that binding vouched for by a Certificate Authority. For device authentication, the device typically proves possession of the private key corresponding to the certificate' s public key (for example, during a TLS handshake). As a second factor in a two-factor model, a certificate (often stored in a TPM, smart card, or secure enclave) represents "something you have"-a cryptographic credential anchored to hardware or a managed endpoint. The other listed options (symmetric encryption, asymmetric encryption, digital signature) are cryptographic operations or algorithm classes, not stand-alone authentication factors. A digital signature is a mechanism used within authentication flows, but it is not itself the credential that establishes an enrolled device identity within PKI. In practice, a certificate-based device factor is commonly paired with a knowledge factor (password/PIN) or a biometric factor to achieve true 2FA, but among these choices, the appropriate second form of authentication in PKI terms is the digital certificate.
NEW QUESTION # 63
(Which mechanism implemented in WPA-Enterprise guards against bit-flipping exploits?)
Answer: A
Explanation:
Bit-flipping exploits target encryption modes or protocols that do not provide strong integrity, allowing attackers to modify ciphertext so that predictable changes occur in plaintext after decryption. To defend against this, protocols add an integrity mechanism that detects tampering. In WPA (including enterprise deployments), TKIP introduced a Message Integrity Check (MIC) called "Michael." The MIC is computed over the frame contents (with additional fields) and verified by the receiver; if an attacker flips bits in transit, the MIC verification fails, and the frame is rejected. While AES (used by WPA2's CCMP) also provides integrity via authenticated encryption, the option presented that directly names the tamper-detection mechanism associated with guarding against bit-flipping is MIC. A pre- shared key is an authentication/keying method (and not enterprise-mode anyway), and a "global encryption key" would be the opposite of what you want-global/static keys worsen security.
Therefore, the intended mechanism that mitigates bit-flipping by detecting unauthorized modifications is the Message Integrity Check.
NEW QUESTION # 64
(What is the RC4 encryption key size when utilizing WPA with Temporal Key Integrity Protocol (TKIP)?)
Answer: D
Explanation:
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.
NEW QUESTION # 65
(What type of encryption uses different keys to encrypt and decrypt the message?)
Answer: C
Explanation:
Asymmetric encryption (also called public key cryptography) uses a pair of mathematically related keys: a public key and a private key. One key is used to encrypt, and the other is used to decrypt, which is the defining "different keys" property asked in the question. In the common confidentiality use case, a sender encrypts a message using the recipient's public key, and only the recipient can decrypt it using their private key. This solves the key distribution problem inherent in symmetric encryption, where both parties must securely share the same secret key in advance. Asymmetric systems also enable digital signatures: the private key signs (creates a signature) and the public key verifies it, providing authenticity and integrity. Symmetric encryption, by contrast, uses the same shared key for both encryption and decryption (even though internal round keys may exist, it is still one shared secret). "Private key" alone is not a full encryption type, and
"secure" is a generic description rather than a cryptographic category. Therefore, the correct answer is D.
Asymmetric.
NEW QUESTION # 66
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