What is the purpose of the Challenge Handshake Authentication Protocol?
The Challenge-Handshake Authentication Protocol (CHAP) is an identity checking protocol that periodically re-authenticates the user during an online session. Properly implemented CHAP is replay attack resistant, and far more secure than the Password Authentication Protocol (PAP).
What is the challenge string in CHAP Challenge Handshake Authentication Protocol?
CHAP authentication uses the notion of the challenge and response, which means that the peer (authenticator) challenges the caller (authenticatee) to prove its identity. The challenge includes a random number and a unique ID that is generated by the authenticator.
What type of handshake occurs with CHAP authentication?
three-way handshake
CHAP is an authentication scheme used by Point-to-Point Protocol (PPP) servers to validate the identity of remote clients. CHAP periodically verifies the identity of the client by using a three-way handshake. This happens at the time of establishing the initial link (LCP), and may happen again at any time afterwards.
Is CHAP three-way handshake?
CHAP uses a three-way handshake to verify and authenticate the identity of the user, whereas the Password Authentication Protocol (PAP) uses a two-way handshake for authentication between the remote user and PPP server.
What is challenge response method?
Challenge-response authentication uses a cryptographic protocol that allows to prove that the user knows the password without revealing the password itself. Using this method, the application first obtains a random challenge from the server.
What is challenge-response method?
What does CHAP stand for?
CHAP
| Acronym | Definition |
|---|---|
| CHAP | Common Humanitarian Action Plan |
| CHAP | Challenge Handshake Authentication Protocol |
| CHAP | Community Health Alliance of Pasadena (Pasadena, CA) |
| CHAP | Community Health Aide Program |
Why is the PPP Challenge Handshake Authentication Protocol CHAP more secure than the PPP password authentication protocol PAP )?
CHAP is a stronger authentication method than PAP, because the secret is not transmitted over the link, and because it provides protection against repeated attacks during the life of the link. As a result, if both PAP and CHAP authentication are enabled, CHAP authentication is always performed first.
What is the difference between PAP and CHAP authentication?
The main difference between PAP and CHAP is that PAP is an authentication protocol that allows Point to Point Protocol to validate users while CHAP is an authentication protocol which provides better security than PAP. It is possible for a user to enable either PAP or CHAP or both on a network.
What is the correct sequence of the three way handshake?
The TCP handshake The exchange of these four flags is performed in three steps: SYN, SYN-ACK, ACK, as shown in Figure 5.8. The client chooses an initial sequence number, set in the first SYN packet.
Is a challenge-response authentication?
In computer security, challenge-response authentication is a set of protocols used to protect digital assets and services from unauthorized users, programs or activities. While challenge-response authentication can be as simple as a password, it can also be as dynamic as a randomly generated request.
What is chap (Challenge Handshake Authentication Protocol)?
Challenge Handshake Authentication Protocol (CHAP) is a Point-to-point protocol (PPP) authentication protocol developed by IETF (Internet Engineering Task Force). It is used at the initial startup of the link. Also, it performs periodic checkups to check if the router is still communicating with the same host.
What is the handshaking protocol used in an authenticator?
It uses 3-way handshaking protocol (not like TCP). First, the authenticator sends a challenge packet to the peer then, the peer responds with a value using its one way hash function.
What are the different types of password authentication protocols?
Summarise the features of the following common types of password protocols: Challenge handshake authentication protocol (CHAP). The challenge handshake authentication protocol or (CHAP) is an authentication method that is initialised by the server or the host.
What is CHAP authentication in PPP?
CHAP is an authentication scheme used by Point-to-Point Protocol (PPP) servers to validate the identity of remote clients. CHAP periodically verifies the identity of the client by using a three-way handshake. This happens at the time of establishing the initial link (LCP), and may happen again at any time afterwards.