אמרת

Why is the Needham-Schroeder Public-Key protocol vulnerable to a Man-in-the-Middle (MiTM) attack?

1

How can the Needham-Schroeder Public-Key protocol be modified to prevent a Man-in-the-Middle attack?

1

What is the final outcome if the Needham-Schroeder Public-Key protocol is executed successfully without any attacks?

1

What is the role of the nonce in the Needham-Schroeder Symmetric Key protocol?

1

שאלה #155223

		To encrypt messages between Alice and Bob
		To verify the identity of the trusted server
		To generate new symmetric keys
		To ensure that the communication is fresh and has not been reused

מיין לפי

Shachar Adam 0 נקודות · לפני חודשיים

מוניטין: 126

Needham -Schroder protocol Kerberos

Shachar Adam 0 נקודות · לפני חודשיים

מוניטין: 126

הבסיס לפיתוח של פרוטוקול קרברוס. הפרוטוקול משיג גם אותנטיקציה וגם חשאיות של המידע.

In the Needham-Schroeder Symmetric Key protocol, what does the server S send to Alice?

1

What is a vulnerability of the Needham-Schroeder Symmetric Key protocol?

1

שאלה #155225

		Eavesdropping on encrypted communication
		Inability to generate new keys
		Replay attack due to compromised or reused keys
		Misidentification of the server

מיין לפי

Shachar Adam 0 נקודות · לפני חודשיים

מוניטין: 126

The Needham-Schroeder Symmetric Key protocol is a cryptographic protocol designed for secure communication between two parties, using symmetric encryption (where both parties share a common secret key).

Shachar Adam 0 נקודות · לפני חודשיים

מוניטין: 126

he original Needham-Schroeder Symmetric Key protocol suffers from a vulnerability to replay attacks. In this type of attack, if an attacker manages to capture an old message from the protocol containing a session key, they can later reuse (replay) this message to trick one of the communicating parties into believing it's a fresh session, potentially gaining unauthorized access.

How can the Needham-Schroeder Symmetric Key protocol be improved to prevent replay attacks?

1

שאלה #155226

		By using larger keys for encryption
		By implementing additional encryption algorithms
		By including a timestamp (TS) to ensure that the session key is fresh
		By changing the key exchange frequency

נערך לפני 4 חודשים

מיין לפי

What is the purpose of including a timestamp (TS) in the Needham-Schroeder Symmetric Key protocol?

1

שאלה #155227

		To authenticate the server's identity
		To ensure the session key is freshly generated and prevent replay attacks
		To reduce the key size for encryption
		To extend the validity of the session key

מיין לפי

What does POSIX stand for?

1

שאלה #155228

		Protocol Operating System Interface
		Portable Operating System Interface
		Public Operating System Interface
		Portable Operating System for Information Exchange

מיין לפי

What type of access control mechanism is POSIX classified as?

1

שאלה #155229

		Mandatory Access Control (MAC)
		Role-Based Access Control (RBAC)
		Discretionary Access Control (DAC)
		Attribute-Based Access Control (ABAC)

מיין לפי

		Because Alice and Bob use the same encryption key
		Because nonces are predictable and easily decrypted
		Because the server distributes the wrong public keys
		Because Eve can intercept and relay messages between Alice and Bob, impersonating each party

		By encrypting the messages with the server's private key
		By using a different nonce for each communication
		By including Bob’s identity in the message with the second nonce (Nb)
		By ensuring that nonces are shared through a secure channel

		The trusted server decrypts all messages between Alice and Bob
		The server generates a symmetric key for Alice and Bob
		Alice and Bob both know each other's identities and share known nonces (Na and Nb)
		Eve intercepts all communication between Alice and Bob

Discuss, Learn and be Happy דיון בשאלות

Why is the Needham-Schroeder Public-Key protocol vulnerable to a Man-in-the-Middle (MiTM) attack?

שאלה #155220

How can the Needham-Schroeder Public-Key protocol be modified to prevent a Man-in-the-Middle attack?

שאלה #155221

What is the final outcome if the Needham-Schroeder Public-Key protocol is executed successfully without any attacks?

שאלה #155222

What is the role of the nonce in the Needham-Schroeder Symmetric Key protocol?

שאלה #155223

In the Needham-Schroeder Symmetric Key protocol, what does the server S send to Alice?

שאלה #155224

What is a vulnerability of the Needham-Schroeder Symmetric Key protocol?

שאלה #155225

How can the Needham-Schroeder Symmetric Key protocol be improved to prevent replay attacks?

שאלה #155226

What is the purpose of including a timestamp (TS) in the Needham-Schroeder Symmetric Key protocol?

שאלה #155227

What does POSIX stand for?

שאלה #155228

What type of access control mechanism is POSIX classified as?

שאלה #155229

		A copy of the symmetric key KAB encrypted under KBS for Alice to forward to Bob, and a copy for Alice herself
		A plain text message with Bob’s identity

אמרת

Discuss, Learn and be Happy דיון בשאלות

Why is the Needham-Schroeder Public-Key protocol vulnerable to a Man-in-the-Middle (MiTM) attack?

How can the Needham-Schroeder Public-Key protocol be modified to prevent a Man-in-the-Middle attack?

What is the final outcome if the Needham-Schroeder Public-Key protocol is executed successfully without any attacks?

What is the role of the nonce in the Needham-Schroeder Symmetric Key protocol?

In the Needham-Schroeder Symmetric Key protocol, what does the server S send to Alice?

What is a vulnerability of the Needham-Schroeder Symmetric Key protocol?

How can the Needham-Schroeder Symmetric Key protocol be improved to prevent replay attacks?

What is the purpose of including a timestamp (TS) in the Needham-Schroeder Symmetric Key protocol?

What does POSIX stand for?

What type of access control mechanism is POSIX classified as?

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