Questions tagged [kerberos]

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Kerberos Use of SHA-1

A lot of good information on Kerbero's encryption methods discussed here, but I there is a second question that arises. Does use of SHA-1 in the overall algorithm weaken Kerberos? If so, will ...
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Why isn't Kerberos using temporary keys to avoid dictionary attacks?

In the Kerberos protocol, the user sends his ID, the server (Or ticket granting server) ID and a nonce value. The Key Distribution Center uses a key (I assume symmetrical) derived from the client's ...
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70 views

Break an encryption made with XOR of a key and a known Nonce

My questions is general, but in my case regards the Kerberos protocol and the communication between the client first message and the KDC. Is there some problem in encrypting using a: (secret key XOR ...
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Why is authentication needed between Alice and Ticket Granting Server in Kerberos Protocol

Being the messages of the protocol: With KAS = Kerberos Authentication Server, TGS = Ticket Granting Server, B is a service and T1 T2 T3 T4 are timestamps. I was wondering why is the "...
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Known plain-text attack on Kerberos

This is a form of the Kerberos protocol I have two questions. Why does this protocol give the opportunity of a known plain-text attack because of no authentication of Joe? And how would an attacker ...
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161 views

Use exported certificate with private key to logon using Kerberos

First I just would like to mention, that my knowledge in windows authentification methods are very limited. So my question: Is it possible to use custom credential provider in windows to log on, that ...
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1answer
82 views

Protocol that generates keys every 2 minutes using KDC

I am using a Key Distributed Center (KDC) and a key distribution protocol such as Kerberos. In order to limit the amount of ciphertext produced with the same key, I want to renew the session keys ...
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390 views

What is the DK function when generating an AES key for Kerberos 5?

I'm trying to understand RFC3962. So far I understood everything, except for the last part: generating the derived key from the PBKDF2 output. To generate an encryption key from a pass phrase and ...
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58 views

Hiding the identity of a party within the Kerberos authentication scheme

In the Kerberos authentication protocol, as described here: would it be safer to replace step (1) with: $$ A \rightarrow T : A, E_{K_A{_{T}}}(B, N_A) $$ so that a passive adversary does not know ...
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1answer
20k views

What does AES256-CTS-HMAC-SHA1-96 mean in relation to Kerberos?

I'm not completely clueless as to what it means, but I'd like to understand it at a higher level. The highest encryption type used by Active Directory domain controllers for Kerberos authentication ...
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287 views

What is sent on the initial communication with Kerberos?

When a user wants to communicate with another user (let's say Alice and Bob), what is sent over the network during the initial communication? Alice uses her Kerberos client and enters her password ...