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Questions and Answers
What does X.800 define as authentication?
What does X.800 define as authentication?
- Providing encryption for data transfer
- Ensuring the communicating entity is who it claims to be (correct)
- Detecting and recovering from data modifications
- Ensuring data integrity during communication
Which specific service under authentication provides assurance about the source of received data in connectionless transfer?
Which specific service under authentication provides assurance about the source of received data in connectionless transfer?
- Peer Entity Authentication
- Connection Integrity without Recovery
- Connection Integrity with Recovery
- Data-Origin Authentication (correct)
What is the difference between Connection Integrity with Recovery and Connection Integrity without Recovery?
What is the difference between Connection Integrity with Recovery and Connection Integrity without Recovery?
- The encryption level provided
- Detection of data modifications with or without recovery mechanisms (correct)
- The speed of data transfer
- The type of entities that are authenticated
Which category of security services focuses on ensuring that data received are exactly as sent by an authorized entity?
Which category of security services focuses on ensuring that data received are exactly as sent by an authorized entity?
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In which authentication exchange does X.800 emphasize confidence in the identity of the entities connected?
In which authentication exchange does X.800 emphasize confidence in the identity of the entities connected?
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Study Notes
Authentication Services
- Peer Entity Authentication: Validates the identity of a peer entity in a communication, applicable during connection establishment or data transfer phases.
- Characteristics: Ensures protection against masquerading and unauthorized replay attacks.
- Data Origin Authentication: Confirms the source of a data unit without preventing duplication or modification, useful in applications like electronic mail.
Access Control
- Definition: Refers to the mechanism that restricts access to host systems and applications via communication links.
- Process: Entities must be authenticated to tailor access rights effectively.
Nonrepudiation
- Purpose: Prevents one party in communication from denying participation in the communication.
- Origin Nonrepudiation: Confirms the message was sent by the specified sender.
- Destination Nonrepudiation: Confirms the message was received by the intended recipient.
Terminology Clarification
- Lack of Universal Agreement: Different interpretations exist for security terms like integrity and authentication across the literature.
- Intended Usage: Aligns with definitions from X.800 and RFC 2828, specifying boundaries between concepts such as identity verification and integrity functions.
General Authentication Functionality
- Authenticity Assurance: Ensures that a communication is genuinely from the claimed source, applicable to both single messages and ongoing interactions.
- Connection Initiation: Confirms the authenticity of both entities involved before the connection is fully established.
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