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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.

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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. ...
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2answers
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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 ...
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1answer
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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 ...
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1answer
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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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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. ...
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1answer
87 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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59 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 ...
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3answers
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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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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 ...
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0answers
36 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
54 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 ...
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1answer
38 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 ...
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1answer
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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 ...
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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, ...
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1answer
89 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 ...
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1answer
289 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 ...
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1answer
110 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 ...
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1answer
120 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?
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1answer
237 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 ...
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1answer
125 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 ...
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1answer
55 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 ...
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1answer
107 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 ...
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10answers
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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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1answer
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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 ...
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1answer
43 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 ...
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2answers
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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 ...
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Non-invasively forcing reauthentication in Bluetooth 2.1

Is it possible for an unauthenticated bystander to force reassociation/reauthentication of a pair of Bluetooth 2.1 devices in a manner similar to IEEE 802.11i deauths? Bluetooth 2.1 (BR/EDR) uses ...
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1answer
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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, ...
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1answer
567 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 ...
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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
177 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 ...
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1answer
547 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 ...
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1answer
279 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 ...
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1answer
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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
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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 (...
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1answer
173 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
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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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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 ...
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1answer
294 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 ...
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1answer
278 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 ...
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1answer
254 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 ...
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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 ...
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2answers
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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 ...
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1answer
462 views

Penetration Testing & TCP/IP Interview Question [closed]

I recently read that as a penetration tester you should be able to explain the TCP/IP protocol in depth, however these writers never say how in depth is good? Rewriting the protocols by hand type of ...
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2answers
102 views

TLS Extentions: Omitting TLS Handshake Messages

I've been reading though various RFCs and couldn't find a definite answer to my question: can a negotiated TLS extension skip some of the TLS Handshake messages and still be compliant with the TLS ...
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1answer
42 views

How to connect to external address as other outgoing port number without proxy [closed]

Is it possible to (mask / define) outgoing port locally on network without using a proxy? default (outgoing protocol) [address] [port] set to (outgoing protocol) [address] [selected port] There ...
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1answer
124 views

File transfer secure from a network security perspective

Let's assume a simple network with a (Windows) server and a (Windows) workstation. Turns out the question of how to securely transfer files between the two isn't obvious considering: I define secure ...
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1answer
247 views

How can I see whether the e-mails I exchanged with someone have been encrypted?

In my understanding (please correct if applicable), The e-mails sent through a secure server are encrypted in the route between me as client and the mail server, whether this is a local or remote ...
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How do adversary models and security types relate [closed]

Reading some questions in this forum I encountered this answer mentioning IND-CPA as a requirement for ciphers. It got me thinking about this paper I recently read, where a formal model of the Honest-...
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335 views

Minimum set of TLS features for an embedded device

I am reviewing the security of an embedded system, specifically how it uses the TLS or DTLS protocol to communicate securely. The system implements as few features of the protocol as it can get away ...