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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q469-Q474):

NEW QUESTION # 469
Harper, a software engineer, is developing an email application. To ensure the confidentiality of email messages, Harper uses a symmetric-key block cipher having a classical 12- or 16-round Feistel network with a block size of 64 bits for encryption, which includes large 8 x 32-bit S-boxes (S1, S2, S3, S4) based on bent functions, modular addition and subtraction, key-dependent rotation, and XOR operations. This cipher also uses a masking key (Km1) and a rotation key (Kr1) for performing its functions.
What is the algorithm employed by Harper to secure the email messages?

A. GOST block cipher
B. DES
C. CAST-128
D. AES

Answer: C

Explanation:
In CEH v13 Module 14: Cryptography, CAST-128 is defined as a symmetric block cipher based on a Feistel structure with:
Block size of 64 bits
12 or 16 rounds, depending on key size
Uses 8×32-bit S-boxes with complex structures (including bent functions) Operates with modular addition/subtraction, XOR, key-dependent rotations, and masking keys (Km) and rotation keys (Kr) All features described in the scenario match the CAST-128 algorithm.
Option Clarification:
B). AES: Operates on 128-bit blocks, uses Substitution-Permutation Network (SPN), not Feistel.
C). GOST: Russian block cipher, also Feistel-based, but structure and key use differ.
D). DES: Feistel cipher with 64-bit block size, but uses 16 rounds and simpler S-boxes.
Correct answer is A. CAST-128
Reference:
Module 14 - Symmetric Encryption Algorithms # CAST-128
CEH eBook: Feistel Network Examples and Use Cases

NEW QUESTION # 470
By using a smart card and pin, you are using a two-factor authentication that satisfies

A. Something you have and something you are
B. Something you know and something you are
C. Something you have and something you know
D. Something you are and something you remember

Answer: C

Explanation:
Two-factor Authentication or 2FA is a user identity verification method, where two of the three possible authentication factors are combined to grant access to a website or application.1) something the user knows,
2) something the user has, or 3) something the user is.
The possible factors of authentication are:
Something the User Knows:
This is often a password, passphrase, PIN, or secret question. To satisfy this authentication challenge, the user must provide information that matches the answers previously provided to the organization by that user, such as "Name the town in which you were born."
Something the User Has:
This involves entering a one-time password generated by a hardware authenticator. Users carry around an authentication device that will generate a one-time password on command. Users then authenticate by providing this code to the organization. Today, many organizations offer software authenticators that can be installed on the user's mobile device.
Something the User Is:
This third authentication factor requires the user to authenticate using biometric data. This can include fingerprint scans, facial scans, behavioral biometrics, and more.
For example: In internet security, the most used factors of authentication are:
something the user has (e.g., a bank card) and something the user knows (e.g., a PIN code). This is two- factor authentication. Two-factor authentication is also sometimes referred to as strong authentication, Two- Step Verification, or 2FA.
The key difference between Multi-Factor Authentication (MFA) and Two-Factor Authentication (2FA) is that, as the term implies, Two-Factor Authentication utilizes a combination of two out of three possible authentication factors. In contrast, Multi-Factor Authentication could utilize two or more of these authentication factors.

NEW QUESTION # 471
A penetration tester is conducting a security assessment for a client and needs to capture sensitive information transmitted across multiple VLANs without being detected by the organization's security monitoring systems.
The network employs strict VLAN segmentation and port security measures. Which advanced sniffing technique should the tester use to discreetly intercept and analyze traffic across all VLANs?

A. Use ARP poisoning to perform a man-in-the-middle attack
B. Deploy a rogue DHCP server to redirect network traffic
C. Implement switch port mirroring on all VLANs
D. Exploit a VLAN hopping vulnerability to access multiple VLANs

Answer: D

Explanation:
VLAN hopping is an advanced attack technique described in CEH materials, used to bypass VLAN segmentation by exploiting switch misconfigurations or vulnerabilities. Two primary methods-switch spoofing and double tagging-allow attackers to gain access to traffic from VLANs they are not authorized to view. This technique enables the capture of inter-VLAN traffic without requiring administrative privileges or triggering security tools. Port mirroring requires administrative control and is not an attack method. Rogue DHCP servers target IP assignment, not VLAN segmentation. ARP poisoning is effective only within a single broadcast domain and cannot traverse VLAN boundaries. Because the objective is to silently access multiple VLANs despite enforced segmentation, VLAN hopping is the correct technique as per CEH's network perimeter attack methodology.

NEW QUESTION # 472
Which protocol is used for setting up secure channels between two devices, typically in VPNs?

A. PEM
B. ppp
C. IPSEC
D. SET

Answer: C

Explanation:
In CEH v13 Module 14: Cryptography, IPSec (Internet Protocol Security) is defined as a framework used to establish secure communication channels over IP networks, particularly in VPNs.
IPSec supports encryption, authentication, and integrity.
Operates in Tunnel Mode (VPNs) or Transport Mode (End-to-End).
Core protocols: AH (Authentication Header) and ESP (Encapsulating Security Payload).
Option Analysis:
A: PEM: Privacy Enhanced Mail (email encryption).
B: PPP: Point-to-Point Protocol (data link layer, not encryption).
C: IPSEC: VPN encryption protocol.
D: SET: Secure Electronic Transaction (used in payment systems, obsolete).
Reference:
Module 14 - IPSec Overview in VPN Security
CEH eBook: Protocols Used in VPNs - IPSec, L2TP, PPTP

NEW QUESTION # 473
Bob wants to ensure that Alice can check whether his message has been tampered with. He creates a checksum of the message and encrypts it using asymmetric cryptography. What key does Bob use to encrypt the checksum for accomplishing this goal?

A. Alice's public key
B. His own public key
C. Alice's private key
D. His own private key

Answer: D

Explanation:
Bob wants Alice to verify that the message hasn't been tampered with. This is a use case for ensuring data integrity and authenticity. The process described matches the creation of a digital signature:
* Bob computes a checksum (typically a cryptographic hash) of the message.
* Then, he encrypts this checksum (hash) using his own private key.
* Alice receives the message and decrypts the checksum using Bob's public key.
* If the decrypted checksum matches the hash she computes from the received message, she confirms the message's integrity and authenticity.
This is a fundamental principle of digital signatures.
Incorrect Options:
* A. Alice's private key is never used by others; it's confidential.
* B. Encrypting with Alice's public key ensures confidentiality, not authenticity.
* D. Bob's public key is used by the receiver to verify authenticity, not for encryption in this context.
Reference - CEH v13 Official Courseware:
* Module 20: Cryptography
* Section: "Digital Signatures"
* Subsection: "Using Private Keys to Sign and Public Keys to Verify"
* CEH Engage Lab: Email Signing and Verification

NEW QUESTION # 474
......

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