1 SUBMITTED BY- PATEL KUMAR C.S.E(8 th - sem). SUBMITTED TO- Mr. DESHRAJ AHIRWAR.

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Presentation transcript:

1 SUBMITTED BY- PATEL KUMAR C.S.E(8 th - sem). SUBMITTED TO- Mr. DESHRAJ AHIRWAR

 Introduction  What is Protocol?  Why Kerberos?  Firewall vs. Kerberos?  Design Requirements  Cryptography Approach  How does Kerberos work?  Kerberos Vs SSL  Applications

Introduction Kerberos is a computer network authentication protocol, which allows nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed primarily at a client–server model, and it provides mutual authentication — both the user and the server verify each other's identity. Developed at MIT in the mid 1980s Available as open source or in supported commercial software.

What is Protocol? protocol is a set of rules which is used by computers to communicate with each other across a network. A protocol is a convention or standard that controls or enables the connection, communication, and data transfer between computing endpoints.

Why Kerberos? Sending usernames and passwords in the clear jeopardizes the security of the network. Each time a password is sent in the clear, there is a chance for interception.

Firewall vs Kerberos Firewalls make a risky assumption: that attackers are coming from the outside. In reality, attacks frequently come from within. Kerberos assumes that network connections (rather than servers and work stations) are the weak link in network security.

Cryptography Approach Private Key: Each party uses the same secret key to encode and decode messages. Uses a trusted third party which can vouch for the identity of both parties in a transaction. Security of third party is imperative.

How does Kerberos work? Instead of client sending password to application server: Request Ticket from authentication server Ticket and encrypted request sent to application server How to request tickets without repeatedly sending credentials? Ticket granting ticket (TGT)

Kerberos Vs SSL

Applications Authentication: It is the act of confirming the truth of an attribute of a datum or entity. Authorization: It check the user is liggle or not Confidentiality: It ensuring that information is accessible only to those authorized to have access. Within networks and small sets of networks

Limitation Single point of failure: It requires continuous availability of a central server. When the Kerberos server is down, no one can log in. Kerberos has strict time requirements, which means the clocks of the involved hosts must be synchronized within configured limits.

The tickets have a time availability period and if the host clock is not synchronized with the Kerberos server clock, the authentication will fail. Since all authentication is controlled by a centralized so attacker may attack the user.

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