Comprehensive and Detailed Explanation:
Non-repudiation ensures that a sender cannot deny having sent a message. This is typically achieved through digital signatures or logs which verify the origin and integrity of communications.
From CEH v13 Courseware:
* Module 10: Cryptography # Security Services
* "Non-repudiation prevents entities from denying their actions, such as sending emails or digital transactions." Reference: NIST SP 800-53 - Non-repudiation defined under Access Control and Audit

A rubber-hose attack obtains cryptographic secrets by applying coercion, intimidation, blackmail, or physical or psychological pressure to a person who knows the password or controls the key. The defining point is that the attacker does not defeat the cipher mathematically. Instead, the human key custodian becomes the attack surface. The disclosure of the master passphrase under pressure therefore makes option B the precise classification.
An adaptive chosen-plaintext attack is a technical cryptanalytic method in which an attacker selects plaintexts, examines their ciphertexts, and chooses subsequent plaintexts based on earlier results. A chosen-key attack analyzes how a cryptographic system behaves under attacker-selected keys or relationships between keys. Neither involves coercing a person. A dictionary attack automatically tests likely passwords against an authentication or encryption mechanism and likewise does not fit the scenario.
CEH v13 treats human weaknesses, key-management procedures, and administrative safeguards as essential components of cryptographic security. Strong algorithms cannot protect information when the corresponding key is disclosed. Appropriate countermeasures include split knowledge, dual control, separation of duties, hardware security modules, short-lived operational keys, and procedures that prevent one individual from possessing unrestricted access to critical decryption material.

Worker Message Block (SMB) is an organization document sharing and information texture convention. SMB is utilized by billions of gadgets in a different arrangement of working frameworks, including Windows, MacOS, iOS , Linux, and Android. Customers use SMB to get to information on workers. This permits sharing of records, unified information the board, and brought down capacity limit needs for cell phones.
Workers additionally use SMB as a feature of the Software-characterized Data Center for outstanding burdens like grouping and replication.
Since SMB is a far off record framework, it requires security from assaults where a Windows PC may be fooled into reaching a pernicious worker running inside a confided in organization or to a far off worker outside the organization edge. Firewall best practices and arrangements can upgrade security keeping malevolent traffic from leaving the PC or its organization.
For Windows customers and workers that don't have SMB shares, you can obstruct all inbound SMB traffic utilizing the Windows Defender Firewall to keep far off associations from malignant or bargained gadgets. In the Windows Defender Firewall, this incorporates the accompanying inbound principles.

You should also create a new blocking rule to override any other inbound firewall rules. Use the following suggested settings for any Windows clients or servers that do not host SMB Shares:
Name: Block all inbound SMB 445
Description: Blocks all inbound SMB TCP 445 traffic. Not to be applied to domain controllers or computers that host SMB shares.
Action: Block the connection
Programs: All
Remote Computers: Any
Protocol Type: TCP
Local Port: 445
Remote Port: Any
Profiles: All
Scope (Local IP Address): Any
Scope (Remote IP Address): Any
Edge Traversal: Block edge traversal
You must not globally block inbound SMB traffic to domain controllers or file servers. However, you can restrict access to them from trusted IP ranges and devices to lower their attack surface. They should also be restricted to Domain or Private firewall profiles and not allow Guest/Public traffic.

SSL/TLS uses a hybrid cryptographic approach:
Asymmetric cryptography is used during the handshake phase to securely exchange symmetric session keys over an insecure network.
After the key exchange, symmetric encryption (e.g., AES) is used for the bulk of data transfer due to its high performance and lower overhead.
This approach balances security and efficiency by leveraging asymmetric encryption for secure key exchange and symmetric encryption for speed.
Reference - CEH v13 Official Study Guide:
Module 20: Cryptography
Section: SSL/TLS
Quote:
"SSL/TLS uses asymmetric cryptography to negotiate keys and symmetric cryptography to encrypt data. This combination ensures secure, fast, and reliable communication." Incorrect Options Explained:
A). Not relevant - all devices follow the protocol regardless of capability.
B). There is no failover mechanism as described.
C). Session keys are exchanged during the handshake, not out-of-band.