Kerberos is a network authentication protocol designed to allow nodes, communicating over a non-secure network, to prove their identity to one another in a secure manner.

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How to avoid DDOS against Kerberos Authentication Server

I have a school project where i am supposed to implement a Kerberos based infrastructure (AS, TGS and resource server). It is already done and working, but i started thinking about how to protect the ...
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219 views

What is inside a Kerberos TGT ticket?

I would like to know what makes up a TGT ticket? The reason is that we've noticed the more Windows AD groups the account is in, the larger the size of the ticket. We've also noticed that when we clear ...
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169 views

Kerberos for sending secrets

I understand that Kerberos is used as an authentication protocol. However, would it be possible to achieve a similar effect as Diffie-Hellman with Kerberos i.e. establish a session key which can be ...
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1answer
82 views

Hash Security of Windows 7 Password

I need to find some materials about how Security Accounts Manager(SAM) works in windows 7+. I am confused with the storage format of hashed value. Many materials (such as, 1) tells me that it uses ...
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is this optional keyword redundant? [closed]

KDC-REQ ::= SEQUENCE { -- NOTE: first tag is [1], not [0] pvno [1] INTEGER (5) , msg-type [2] INTEGER (10 -- AS -- | 12 -- TGS --), padata [3] SEQUENCE OF PA-DATA ...
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1answer
105 views

What good does the Kerberos Authentication Server

I currently try to understand the Kerberos protocol. And I think I understand the parts of it. How Alice gets a ticket from the Authentication Server to authenticate herself to the ticket granting ...
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1answer
109 views

SAML and kerberos what to use where [closed]

I came across SAML and kerberos, both are used to establish identity using assertions (tickets) so is there an overlap in their use ? Can somebody highlight their differences and point which ...
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1answer
264 views

Relative merits of Heimdal and MIT Kerberos?

What are the relative advantages of Heimdal and MIT Kerberos now MIT is freely exportable? Ones I've come across so far that might be relevant to my particular project is that it seems MIT supports ...
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918 views

Kerberos authentication over the public internet

What are the threats to having the KDC accessible via the internet for remote clients? It's my understanding that the authentication is a challenge/response protocol and that the password is never ...
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1answer
30 views

What security mechanisms enable a user to change their password under a Kerberos environment?

During client authentication, neither the secret key nor the password is sent to the KDC. If a user changes their password on the client, how is the password updated in the password database in the ...
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1answer
152 views

With a 'man in the middle' attack, can the attacker find out Client/Server session keys with a compromised AS/TGS secret key?

Assuming that an AS/TGS secret key has been compromised by a 'man in the middle' attack who in turn can monitor the network traffic, is an attacker able to find out the Client/Server session keys ...
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Get Service_key in the course of kerberos authentication

Built environment 1) Exchange server: The operator system of Exchange server is Windows Server2008R2, We configured it as Active Directory (primary domain controller) used for client authentication ...
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How to get Service_key and the corresponding function call interface from the Samba source TGS_REP part

1, My existing configuration environment are as follows: (1), Server_side, Redhat5.5 Enterprise with samba4.0.0 installed, Ip Address: 5.5.5.149; domain name: EXAMPLE.COM; (2), Client_side: windows ...
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Kerberos - what can an attacker achieve from a replay attack?

On the last step of Kerberos, the client sends the target server a ticket and an authenticator. One of the authenticator's parts is a timestamp. The timestamp is said to prevent replay attacks, as the ...
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149 views

Teaching security concepts

I think it would be nice to teach security concepts by giving practical examples. I am looking for some practical cases for x509 certificates, kerberos and SET. How could I know an ecommerse site ...
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1answer
474 views

Preventing LSASS from storing clear-text passwords in Kerberos environment

It is a well known security risk that LSASS stores clear-text passwords if a user has performed a keyboard-interactive logon on a machine - be it local login to his/her workstation or using RDP to a ...
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1answer
68 views

Kerberos v4 compromised TGS [closed]

What would happen under the Kerberos v4 protocol if an attacker has compromised TGS and identified the Ktgs key? What would be the outcomes of such an attack?
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1answer
67 views

Remote network security option

I'm a bit confused with some different network security techniques. Say we want a secure communication with a particular mail server in a remote company network. Reading and sending mails should be ...
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456 views

krb5 and pam_mount

I successfully installed and configured krb5 on a Red Hat 6.4 server, now I can authenticate against an active directory with kerberos. pam_mount is installed and configured, but it only mounts a ...
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1answer
175 views

Kerberos realm understanding

Could someone summarise why realms are necessary in Kerberos and the advantages of the concept. I'm struggling to isolate everything I know / beginning to understand into some well defined points for ...
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267 views

Implications of having a service account in AD use RC4 rather than AES for Kerberos?

Bear with me, I know this is sloppy, but here is the back story: We have a partner that uses Jira and is using spnego with a custom auth back-end that expects certain group membership in the token. ...
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1answer
393 views

Public web server and AD- based Kerberos authentication

I would want to use SPNEGO/Kerberos protocol on a public internet webserver for specific remote ip addresses coming from corporate intranet. Other authentications methods are used for other addresses ...
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1answer
143 views

Kerberos ticket lifetime

I was just reading up on Kerberos and realized that the lifetime of a master ticket called the TGT(ticket granting ticket) is 25 hours. Is there any particular reason behind this choice of lifetime?
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1answer
119 views

Do public keys make Kerberos more secure (RFC4556)?

We're using IPA to centralize our authentication and I found an option to add a public key for each user. After doing a little research I found this to be an extension to Kerberos 5, RFC4556. From my ...
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79 views

Distinct databases with the same Kerberos Authentication server

Should two deployed applications within a private network requiring distinct databases (for storing their own users credentials) require distinct Authentication servers (implementing Kerberos)? Or is ...
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1answer
890 views

Does the Kerberos KDC know the users' plaintext passwords?

In http://www.freebsd.org/doc/handbook/kerberos5.html section 15.7.8.3 “The KDC is a Single Point of Failure” you can read: By design, the KDC must be as secure as the master password database is ...
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1answer
292 views

secret key compromise in SSL vs in Kerberos

Consider the consequences of compromise of a secret key in the Kerberos system vs. in SSL. For example, suppose your individual shared secret key (for your user account) becomes compromised (i.e. it ...
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1answer
198 views

How do we encrypt a password using another password?

Heys all I've got a nub question, I was wondering What does it mean to encrypt a password using another password? For example I want to encrypt a password foo using a password bar, does it mean that ...
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1answer
116 views

Are the SSL Digital Security Certifiactes based on Kerberos Network Security Protocol

I just want to know if digital certificates use the kerberos session key algorithm.