Questions tagged [protocols]
A description and set of rules for the ordered exchange of structured information designed with the goal of protecting the security of the system.
288
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25 views
Open source KMIP Server in a production-level environment [closed]
I need to use a KMIP server for a project and searched for an open source solution. The only viable options I found are PyKMIP (https://github.com/OpenKMIP/PyKMIP) and KMIP4J (https://sourceforge.net/...
0
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0answers
67 views
Secure protocol without back-and-forth for IoT [closed]
I am looking for a secure protocol that does not require more than one round trip in order to send a message and receive the response.
The reason behind this requirement is that our connection goes ...
0
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1answer
58 views
Remote authentication with random number challenge vs timestamp?
Many remote-terminal to server authentication protocols use random numbers sent by the server as a challenge that the user will encrypt and send back to the server. This way an adversary cannot ...
3
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0answers
53 views
Good book detailing the security aspects of Microsoft Active Directory [closed]
I am attending training later this summer related to AD pentesting. As such, I wanted to ask for book recommendations which detail (in full or in part) the security aspects of Active Directory. The ...
0
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0answers
30 views
In Kerberos authentication protocol, why is the TGT encrypted using the user's key Ka?
When the user first logs in, he fetches his TGT from the KDC along with the session key. I get why Sa (session key) is encrypted with Ka (user's key). But why is TGT also encrypted with Ka. TGT is ...
0
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1answer
50 views
Security element that relate to breaking protocol
I am working on evaluating an unsecure protocol. I am trying to categorize the vulnerabilites according to some commonly accepted security elements like the ones specified in the CIA triad or the ...
3
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1answer
64 views
Verifying Security of a Custom Network Protocol
I’ve designed a custom network protocol using high-level LibSodium primitives for authentication and encryption. The purpose of the protocol is for a game, and the security is to ensure only paid ...
0
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1answer
51 views
Is there such a thing as an Authenticated Protocol?
I need two devices to communicate in plain sight and I want to know what to ask for. Nothing is secret so no need to encrypt. However, I need the source to be authenticated to prevent bad actors from ...
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1answer
31 views
Criteria for selecting fields and network protocols for fuzzing
I want to test a specific device connected to different networks using fuzzing. For each network interface, there are different services listening using different protocols, with open specification.
...
2
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2answers
63 views
Trouble trying to understand SET protocol
This is the first class I'm having on security and one of the concepts discussed is the SET protocol. I've read about it in many different sources and although I came into many unknown terms, after ...
1
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1answer
135 views
How does the KeeLoq block cipher work?
Note: This question is follow-on from comments on this answer that were broad enough to be a separate question.
As far as I understand, KeeLoq is a block cipher designed for use in the automotive ...
1
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1answer
356 views
OAuth 2.0 when and how to use the client id and secret
The OAuth 2.0 protocol uses the client id and secret. It considers the client id to be public while the secret is private. Anyway it also considers to generate the client id randomly with a certain ...
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0answers
33 views
Formal verification of security protocols
When you try to verify security protocols you have to do a lot of different steps like formalizing a simpler version based on a extremely complex real protocol using some extended Dolev Yao model. ...
3
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1answer
118 views
How do I know that the request and response is using encryption protocols in burp suite?
I know these things can easily be done on wireshark, tshark, etc but is it possible to know that the request I forwarded and the response I received is using protocols such as TLS, TLSv1.2, TCP, HTTP, ...
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1answer
60 views
What are the flaws in this security protocol between client and server? [closed]
Here is my security protocol for the use of a service provided by server. It utilises a symmetric key:
Client requests to use a service
Server sends back nonce
Client sends back nonce encrypted with ...
1
vote
3answers
209 views
Why is it required to HMAC riv in HDCP 2.3?
In HDCP 2.3 (pdf) during the Session Key Exchange, the HDCP transmitter sends also the 256-bit HMAC of riv (HMAC-SHA256(riv, kd)).
Why is it required? Does it prevent any attack?
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0answers
37 views
Kerberos Protocol Centralized Server
If a small company is expanding with various branches across the country, how would the kerberos centralized server be configured? Are the new users assigned new ticket granting servers or are they ...
1
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0answers
45 views
Provide email author origin integrity [closed]
If i receive an email, how does my computer verify the author origin integrity using the digital certificates? Does it use any specific protocol for this?
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1answer
60 views
Are there other methods than fuzzing for black box?
I find fuzzing a bit to basic method if it comes to black box apps. I am specifically interested how to find a vulnerability in network protocols. I have read "Attacking Network Protocols" but only ...
1
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1answer
49 views
NAS with a public IP and multiple file sharing services – security concerns
I've ‘inherited’ (it's now my responsibility to take care of it) a WD My Cloud EX2 with a public IP and since it's exposed to the internet, I want to make sure that the data and other machines on the ...
0
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1answer
92 views
Is it possible to become infected with virus, trojan or malware by browsing the infected sites or running installation .exe?
I am quite paranoid and I am always afraid that when i accidentally open some infected sites it would run scripts that automatically download malwares, viruses and trojans into my pc and run by ...
2
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0answers
27 views
Multi Party Protocol - Proof with semi-honest adversaries
I have designed a protocol where one entity acts as a "client", sends information to one of many "server-parties". This second party sends some other information to another "server-party" and so on, ...
0
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1answer
119 views
How are USSD messages used and who could send them?
Some illegal ads started showing up on my Android phone as message boxes recently. They are said to be "USSD messages" in an app recording notifications (com.evanhe.nhfree).
There is a Wikipedia ...
1
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1answer
801 views
Where exactly in the OSI model does TLS/SSL belong [duplicate]
I am trying to understand where exactly SSL/TLS sits in OSI model. If I look at this answer on StackExchange,
While all network models are imperfect, this question can only be
answered by looking ...
2
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1answer
118 views
Slow Hashing Without a Salt?
I'm trying to design a security scheme that involves a shared secret but isn't a traditional account password situation. The server would store a set of "keys", each of which has a blob of data ...
1
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1answer
291 views
Is there any open source SDK for implementing a KMIP server?
Is there any reputable open source SDK for implementing an OASIS Key Management Interoperability Protocol (KMIP) server?
3
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1answer
268 views
What is httpvh:// and is it the result of something malicious?
I was working on a client's old website and I noticed that some of their YouTube links were broken and looked like this:
httpvh://www.youtube.com/watch?v=jNQXAC9IVRw
At first I assumed it was some ...
4
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1answer
155 views
Simple File Transfer Protocol
My SIEM has produced something intriguing. I went looking for unauthorized SSH connections, and looked for the SFTP protocol by mistake. I found a Windows web server that is connecting from port 80 to ...
2
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1answer
65 views
Does EAP exist as an independent authentication protocol, or just as a framework?
Does EAP exist as an authentication protocol itself, or will it only be found implemented as one of its methods (EAP-TLS, EAP-TTLS, etc)?
If EAP is only a framework, what additional detail do its ...
0
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1answer
172 views
What does a secure path mean?
I saw it in a slide for Mark Stamp. He says:
"Authentication on a stand-alone computer is relatively simple: 1) For
example, hash a password with a salt. 2) “Secure path,” attacks on
...
89
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10answers
20k views
Does it improve security to use obscure port numbers?
I recently started a job at a small company where the CTO prefers to host SSH services at obscure, high numbered ports on our servers rather than the well known port 22. His rationale is that "it ...
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votes
1answer
377 views
LTE Security: What kind of cryptograpy could be used to fix layer 2? [closed]
New attacks on LTE:
https://thehackernews.com/2018/06/4g-lte-network-hacking.html
https://www.alter-attack.net/media/breaking_lte_on_layer_two.pdf
Layer two (data link) does not guarantee the ...
0
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1answer
46 views
Trustable Sources For Security Algorithms and Standards?
I am learner of cryptographic algorithms and security standards. I usually Google it to understand the basics of the algorithm or the protocol, and to find an implementation of a protocol. However I ...
2
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2answers
118 views
One way protocol with encryption without tcp
I am trying to brainstorm how I might either:
1) create a protocol (although against this option)
2) use an existing protocol
That does the following:
1) allows 1 way communication from 1 node to ...
7
votes
1answer
4k views
What are non-standard ports and protocols [closed]
I am new to the security field and reading about how to check if an application is secure. One of the checks involves finding out if the app uses non-standard security ports and protocols. However, ...
3
votes
1answer
1k views
MsChapV2 authentication and Evil Twin attack
I'm trying to understand the dynamics of the authentication process in the MS-CHAPV2 protocol. In particular, if I implement an Evil Twin attack I can't understand how it's possible that I can ...
7
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1answer
3k views
WireGuard VPN: how safe is it for production in its current state?
In our project we had to build a VPN to get through to computers residing behind NAT. I never did it before. While looking for suitable software I came across WireGuard which claimed to be very simple....
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1answer
235 views
Does TLS protocol make encryption at L2/L3 layers redundant?
If a pair of endpoints are using TLS protocol for secure data exchanges, does it make the encryption at the network or MAC layers redundant?
E.g. if I create a TLS session between two endpoints ...
9
votes
1answer
644 views
Why does TLS 1.3 deprecate custom DHE groups?
According to the second draft of the TLS 1.3 specification, custom DH groups have been deprecated. As we all know, hardcoded DH groups are vulnerable to a precomputation attack that allows retroactive ...
1
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1answer
350 views
Does TLS 1.3 encrypt alert messages?
I'm working quite some time now with TLS 1.3 implementations (OpenSSL, WolfSSL), but I can't find anywhere in the TLS 1.3 drafts if alert messages should be encrypted or not. I personally thought only ...
2
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1answer
82 views
Are there techniques or methods to develop security protocols without side channel attacks?
In general timing attacks are a manifestation of the implementation. So if I am processing data on the server or the client then I can leak information depending on how the code is written.
To ...
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1answer
82 views
How to restrict my PC to browsing only for security reasons? [closed]
I have a PC that i only use for browsing the web. I do not have any problem with disabling any other services/protocols that does not affect web browsing.
I want to disable these unnecessary services (...
2
votes
1answer
205 views
What's the fastest protocol to target for password attacks
In a Windows domain environment, there are numerous protocols (SMB, LDAP, Webpages, RDP, FTP, etc.) that query against the same Windows based AD. Many of these protocols have their own overhead that ...
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2answers
1k views
Why is SQL considered to be a session layer “protocol”? [closed]
Within the OSI-Model, why is SQL considered to be a session layer "protocol"? Isn't SQL a language and not a protocol at all?
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2answers
138 views
Is there any way to protect a client-side game from a hacked client?
Here's a toy example of a game: the player is presented with N slot machines. They can click on each slot machine once, and when they do so, the slot machine rolls a random outcome (based on a ...
15
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1answer
324 views
Why is caller ID spoofing so simple, and catching offenders so hard?
There is plenty of software which allows a user to input a recipient's information, and a fake-originator's information, and the software will complete the caller ID spoof. I'm trying to understand ...
4
votes
1answer
328 views
Secret Santa - implementation that does not require a participant to trust the server
In the Christmas spirit I read Cryptographic Secret Santa from MathOverflow, and then followed the link to another page titled Cryptographic Secret Santa.
On this latter page the author explains an ...
2
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1answer
339 views
Is it safe to store secrets in LDAP?
Many systems store secret or sensitive information in LDAP attributes. For example, IEC/TS 62351-8 prescribes storage of user tokens in LDAP.
Is it safe to store secret or sensitive information as an ...
3
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0answers
100 views
Is there a secure, anonymous peer to peer matching solution?
I am newbie so please pardon my naivete. I was wondering if there is any cryptographic procedure that allows for peer to peer matching.
Perhaps to illustrate my question I will use an example. Say I ...
9
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2answers
4k views
Is it already the right time to say goodbye to TLS1.1 support on web servers? [closed]
Reading different articles, mentioning this one, for the sake of this question on old TLS topic.
Quoting part of the article:
30 June 2018 is the deadline for disabling SSL/early TLS and ...
