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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Does any real world protocol makes use of the associated data in AEAD?

I'm trying to find evidence of use of the associated data (authenticated cleartext associated with the encrypted and authenticated data) feature offered by AEAD (Authenticated Encryption with ...
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How to evaluate a responsive but unknown network protocol?

I am studying CREST CPSA where the syllabus is listed here. There is a part of the syllabus which states I should know the Evaluation of responsive but unknown network applications. I find this ...
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Why is the authentication server needed in the Kerberos protocol

Consider the diagram in https://en.wikipedia.org/wiki/Kerberos_(protocol)#/media/File:Kerberos_protocol.svg depicting the Kerberos protocol. I'm wondering how the authentication server (AS) is useful.....
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Usage of HMACs to verify the licensing during production

We have a production that uses our software (put on a chip) and a requirement that we need to limit the amount of chips produced for each customer (so they need to buy a license) - so they can't ...
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Can proprietary protocols be considered as secured?

I am new to the info-sec industry and was recently tasked with evaluating the communication protocols used by my various subsystems. So it was stated in the requirements that the systems have to ...
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Standard for encrypt files before transfer them over internet

I know there are some standards for transferring data securely such as HTTPS for web applications, or SPC & SFTP for secure file transfers. Encrypting files using PGP is a way to encrypt files ...
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Could someone the real IP address when using tunnel protocols like ngrok, localtunnel or serveo?

Could someone get the real IP address that is hidden behind the URL generated by tools like ngrok, localtunnel or serveo?
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Should I be seeing network management protocols on 'user' subnets?

When performing a passive packet capture of a network, I have seen a large amount of traffic being broadcast using different protocols. These protocols are primarily used to perform some kind of ...
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Can my ISP see which VPN protocol I am using?

I know that my ISP can detect when I am using a VPN, but can it see which protocol I am using?
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Why isn't U2F's CTAP protocol forwards-compatible with FIDO2's CTAP protocol?

I've been trying to find the major differences between "U2F" versus "FIDO2" two-factor authentication standards. Reading some of the articles posted by different companies and even ...
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Defending against Wiegand sniffing (ESPKey) attacks in RFID card readers

It's known that card readers, which use the Wiegand format, can be attacked by installing a sniffer, such as an ESPKey. After the sniffer is installed, whenever anyone uses the reader, their ...
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Can I elicit responses from "any remote host" on "all protocols" if I want to?

An nmap scan of my test computer returns a result of “5357 / tcp open wsdapi”. After some research, this is something that can be exploited. It is explained here that: By default, WSDAPI will listen ...
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TLS client does not drop connection even when there are no suitable ciphersuites in the server ciphersuite list during handshake

I have two Windows systems, and I want to establish an encrypted TCP/IP communication between them. Specifically TLS 1.2 or TLS 1.3. I have configured in both systems the list of allowed ciphersuites: ...
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Performing a simpler ssl handshake [duplicate]

Consider the following scenario: client sends hello server send a hello and its certificate client generates a key and encrypts that with server's public key server decrypts the key with its private ...
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How Wifi prevent hacking in the same network?

We all know that the client device and WiFi AP will perform the 4 way handshake to generate the session key (PTK). Here is the recap of the 4 way handshake. 1.Client device<-----ANonce-----WiFi AP ...
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How do I write my own authentication protocol and add that to OpenWrt? [closed]

I would like to add a ticket based authentication mechanism to my network. Can you give me brief idea where do I start, which language should i write the protocol in and how do i get those in my ...
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Can an ISP block BitTorrent peer discovery but not file transfer?

When I start new torrents, I find there is no traffic for hours. I switch to another network (a cellular data hotspot) and the torrents start flowing. I return to my usual network, and the torrents ...
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Can using web-based protocol handlers for protocols such as mailto: links be dangerous in any way?

My question is specifically about an option in Google Chrome under Settings > Site Settings > Handlers. I've read in the past that with desktop-based protocol handlers--such as Office Outlook or ...
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Detect use a private key by more than one or by someone other than the owner [closed]

I'm designing a protocol over the SSL but I faced a challenge. In the network each user takes a private key from authority. I want to just the owner can use his/her the private key. there are two ...
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2 votes
1 answer
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Deauth not working on a certain network and I want to understand why

I've done some research for the past hour but I can't find a definitive answer to what is happening. So I use a AWUS036NHA, put it in monitor mode, sniff everything, then sniff the AP I want to do ...
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Should I disable TLS 1.0 and TLS 1.1 support on my web servers

Currently, my webserver support TLS 1.0 TLS 1.1 TLS 1.2 One of your single sign-on clients will move to TLS 1.2 on 1st April 2020. Can I remove TLS 1.0 and TLS 1.1 now? Or I need to wait till ...
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WiFi Router, current status of security options?

I'm about to buy a new WiFi router tomorrow (probably) & I'm wondering what kind of security features I should choose (Like: AES, WPA2, DMZ, TKIP, SPI, ...) What is the current status of what is ...
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What is the problem with developing secure protocol on top of communication protocol without binding

I read that developing a security layer on top of communication protocol without any binding between them could cause an issue like MITM attack. I am having a hard time seeing how that could be ...
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What is extension intolerance in the context of TLS?

SSL Labs checks for TLS version intolerance and TLS extension intolerance. I've seen another answer on this site that covers version intolerance, but what does extension intolerance mean, specifically,...
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Cardholder info transmission between issuing and acquiring banks

Which data is actually transmitted between issuing and acquiring banks during various phases of a card payment transaction? Specifically, does the Issuer tell the Acquirer any info (and which if any?)...
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SSH and the ECDH component

With SSH, most of my servers use ed25519 (the twisted Edwards variant EC) for authentication. I was wondering, after authentication with ed25519, does SSH protocol 2 simple use ephemeral/ephemeral ...
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Is this symmetric key system secure?

I am creating a secure network data transfer system, and would like to know if there are any obvious flaws in this scheme. Secrets The secret is a password that is known to both clients. This ...
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Advantages of EAP Authenticator in EAP protocol

What is the purpose of using a EAP authenticator in the EAP protocol ? Since underhood, the authentication procedure is between the EAP peer and the authentication server, what is the advantages of ...
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Does the SSL record protocol encrypt the handshake protocol too?

As I know the first communication protocol which establishes between client and server in SSL is handshaking protocol and as this site says: The SSL record protocol is used to transfer any data ...
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Thought process on Network Protocol Attack

I'm preparing for an introductory information security examination in university and this is one of the tutorial question on Network Protocol attacks. I tried (a) and came to this conclusion: Since ...
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2 votes
1 answer
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Is this key exchange algorithm secure and valid? [closed]

I'm writing reliable UDP implementation and I want it to be secure. Also, I want to make use of elliptic curve cryptography. I don't have the proper education to really understand the math behind this ...
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What protocols are authenticated by Active Directory?

Most of the new authentication solutions (IDaaS) are focused on HTTP (for example implementing SAML and OIDC). What protocols does Active Directory support, that are not normally supported by IDaaS?
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Access Control Lists - Why block a port rather than block a protocol?

I am studying for my Security + exam. I have just learned that ACLs can be designed to block ports and/or entire protocols. The book I am reading states an example: "if you want to block HTTP traffic,...
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2 answers
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technical difference between TLS and a certificate [duplicate]

I don't quite understand what the difference is between TLS and a certificate. TLS secures the transmission by encrypting the data. So normally no man in the middle attack is possible and nobody else ...
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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/...
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Remote authentication with random number challenge vs timestamp? [closed]

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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 answer
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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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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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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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1 answer
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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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1 vote
1 answer
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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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1 answer
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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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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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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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