Questions tagged [handshake]

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57 views

SSL server sends wrong certificate when accessed via Java

In my project I have to integrate with another system which uses quite specific SSL (and also specific cipher suite). Here's what I mean. Whenever I try to access the server with Java (send a request)...
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0answers
60 views

why does ssl need record protocol?

According to this answer, I think that this fact that at the beginning of communication, record protocol just uses a null cipher will make some issues. For detecting any issue, I need to know in which ...
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1answer
64 views

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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1answer
43 views

Does a TLS client needs to support one of the named groups (curves?) supported by the server for TLS handshake to succeed?

Does a TLS client needs to support one of the named groups (curves?) supported by the server for TLS handshake to succeed? Longer version: I'm running a web site using Windows Server 2016. The web ...
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2answers
71 views

Handshake without asymmetric encryption

One of my teacher said "Without asymmetric encryption, we would be forced to use third-party to initiate any connection". I don't understand how it can be possible, what if an attack occur during the ...
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0answers
15 views

Which part/step of the TLS handshake is essential for providing PFS? [duplicate]

I would say the key exchange part, because PFS is used only during the key exchange of server and client. Am I right or have I overlooked something?
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1answer
56 views

TLS handshake random bytes reused

What would happen if the random bytes provided by the client and the server in the first two messages would be reused by one peer/by both peers? I think it would highly reduce the provided security, ...
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1answer
67 views

SSL Handshake problems

I captured my network traffic to a web server and the SSL Handshake consists only of two packets. Why does that happen and why aren't there all the other packets?
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2answers
278 views

SSL handshake not visible in Wireshark

In my organization we have a cloud proxy that work on a loopback address. The vendor of this proxy has deployed an app on our machine which listens on the loopback address. I have captured the apps ...
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3answers
5k views

Can attackers change the public key of certificate during the SSL handshake

The communication is not encrypted during the SSL handshake. If an attacker conducts a man in the middle attack between server and client to capture the certificate, and change the public key in the ...
2
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0answers
211 views

Airgeddon-ng Handshake fail [closed]

I've followed the following instructions below. This is a freshly installed Parrot OS, not using VirtualBox and etc. I am also using Alfa AWUS036NHA wifi adapter. ifconfig sudo airmon-ng start wlan1 (...
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1answer
98 views

how are symmetric keys generated in TLS [duplicate]

My confusion stems from reading that TLS handshake uses some kind of Diffie Hellmann, when I was certain that the symmetric key was generated by a digest of earlier packets encrypted with clients ...
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1answer
62 views

Do wifi access points and routers get some kind of data from devices when a device is able to see them?

I was wondering if when a router is broadcasting its signal, it is able to handshake with devices that are wifi enabled and looking for a wifi network to connect and get some info from them?
2
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1answer
41 views

Is it possible to setup 1-way TLS client authentication without server certificates?

Is it possible with TLS to only authenticate the client? In other words can one-way TLS be setup in such a way that only the host initiating the connection uses a client certificate and the second ...
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0answers
23 views

What are these semi-arbitrary, seemingly nonsensical TLS hello bytes? [duplicate]

I'm comparing two different TLS ClientHello packets sent from a single client across two requests to the same remote host. For the most part the data is as expected (no change except for the ...
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1answer
188 views

TLS-Handshake, Server Key Exchange, Diffie-Hellman: Where does key length come from?

Where does the key length come from? In this example it is 2048 bits long: Secure Sockets Layer TLSv1.2 Record Layer: Handshake Protocol: Server Key Exchange Content Type: Handshake (22)...
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1answer
108 views

Authentication handshake between two independent apps

I need help on a solution for below scenario from a security perspective. Scenario: There are two independent web applications App1 and App2. User will log in to App1 by performing authentication ...
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2answers
386 views

Interpreting SSLLabs Handshake simulation results

While testing SSL/TLS details on ssllabs.com for a website, the Handshake Simulation part contains: TLS 1.2 > http/1.1 TLS 1.2 > h2 For eg: What do these things mean? I couldn't find it ...
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1answer
116 views

Key reinstallation attack how does it work without a pre-shared key?

The author of the key reinstallation attack released scripts on Github to test AP and clients. To test the clients, you have to connect to a fake AP but you still need to know the pre-shared key. Of ...
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0answers
295 views

TLS Pre-master key [duplicate]

If I have access to the pre-master key of a TLS handshake, is it possible to decrypt the rest of the handshake following this? If so, is it possible to get the pre-master key while it is still not ...
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1answer
113 views

Can do I brutefore wifi password with handshake without wifi detection? [closed]

I have captured handshake but now I want to bruteforce wifi without detection it (in different place). Is it possible? If yes, how to do that?
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0answers
45 views

Identify SSL invalid handshake using Wireshark

I am doing a research on "Network flow anomaly detection" and use Wireshark for my work. I have a problem of identifying the packets with invalid SSL/TLS handshakes. Is there a way/algorithm to detect ...
3
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1answer
265 views

Is it possible to make HTTPS 0-RTT with help from DNS?

This article gives an implementation of encrypted SNI where a public key is retrieved from the DNS. It feels like cheating but imagine this: If the server publishes its certificate on its DNS record, ...
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1answer
134 views

How does Authenticator gets the PMK which is used to calculate PTK?

I am trying to setup a Supplicant- authenticator and AAA server to perform EAPOL mechanism. I am able to successfully completed the EAP authentication procedure but 4-way handshake was not initiated ...
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0answers
78 views

WPA technical doubts (3)

This is the third post about the set of doubts that came up when I tried to understand WPA3. I am new to this world of cyber-security so every bit of help is welcome! Someone told me that in WPA2 ...
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1answer
825 views

Finding wpa2 key length

Is it possible to determine WPA key length through a successful handshake? Below is a screen capture showing the packet capture session of interest as displayed in Wireshark: My question came from ...
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2answers
3k views

What is the Session ID parameter indicate in Client Hello and Server Hello messages

I was trying to understand the TLS handshake in depth. I set up Wireshark and captured the github.com traffic. While inspecting the Client Hello and Server Hello, I found a parameter Session ID. ...
2
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1answer
178 views

TLS 1.2 Missing Finished Message

I'm setting up a TLS connection for the purposes of sending secure SIP. The remote gateway (Twilio) doesn't always send a finish message and as such those requests fail. Everything else appears to ...
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2answers
941 views

Where is Hashing Used in the TLS Handshake

I understand the basic steps in the TLS handshake. My question is, where and how does one-way hashing fit into the steps below? Is it the session key that is hashed? Many texts mention that the ...
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1answer
94 views

How SSL Handshake recognise any attack

I already know that a replay attack on an SSL handshake is ineffective, but if we suppose that an "intruder" has listened and has got all of the information from a previous handshake, how will the ...
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0answers
158 views

Why WPA2 did not design a PTK based on asymmetric cryptography?

I was shocked to learn how the PTK is crafted from the PMK in WPA2 WiFi. PMK is made with crypt_hash(SSID + PSK). OK, seems good. Then, the client and the Access Point (AP) make the famous 4 way ...
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2answers
428 views

Do TLS standards require the server-side preference to always be used when negotiating ciphers to use?

Someone told me the other day that the TLS standards require the server-side to always have the authority to decide which mutual cipher to use when negotiating with a remote client. This makes sense,...
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0answers
61 views

What forces SSL exchange to require my smartcard to finish handshake

First, I hope that this is a legitimate question because it is spawned by what I am experiencing and what is happening. The environment is as follows... I have an apache reverse proxy, that I stood ...
3
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1answer
453 views

What are the factors making a WPA2 handshake suitable for cracking?

Days ago I was dumping handshakes of my APs using airodump-ng. I would later use aircrack-ng to crack them using wordlists which would purposely contain the passphrases. However, I noticed that some ...
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2answers
165 views

Why not encrypt TLS handshake?

this is my first question here, I've researched this briefly but couldn't find any satisfying answer. TLS handshakes are being sent over the wire unencrypted. This way someone that eavesdrops can ...
2
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1answer
261 views

In TLS 1.3 handshake, can an internal error at the client be interpreted as a decrypt error at the server?

In TLS 1.3 handshake protocol, the client sends the ClientHello message to the server. The server then sends back the ServerHello message followed by some encrypted messages. The client then computes ...
4
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1answer
155 views

Circumventing Netflow's visibility on SSL traffic

In a SSL handshake, the hostname is visible most of the time as it is needed to validate the certificate over HTTP. Netflow is thus able to pick up the common name from the certificate exchange, ...
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0answers
434 views

SSL/TLS handshake potential vulnerabilities [duplicate]

After handshake one could be assure that data are encrypted and secure. But before that, handshake parameters are transferred via not secured channel. One could be MitM during the handshake procedure....
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0answers
247 views

what is the logic in choosing a certificate chain during a “server-hello” message in a SSL/TLS handshake

In a client-server ssl handshake, my server sends a certificate chain back to the client in a server-hello message. But I want to understand as to how that particular certificate chain is getting ...
3
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1answer
8k views

HandShake TLS- Certificate Unknown

I have added the necessary certificates to communicate a web service by TLS, both the client and the server added the certificates to the keystore, but in the handshake, certificate unknown is ...
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2answers
67 views

Decide for client certificate auth in https based on hostname or url

Let's assume this (made-up) scenario: I install a webserver that reacts on two hostnames (anonymousserver.com and authenticatedserver.com) I would like the following behaviour: If the webserver is ...
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2answers
1k views

Airodump-ng doesn't capture handshake or sees any devices connected on Kali, but captures everything on Backtrack. How to fix it? [closed]

I ran into a problem in using kali linux system. Kali doesn't allow me to see any devices connected to certain spot or capture any handshakes, I know that it can capture them(and see connected ...
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1answer
731 views

Sniffed SSL/TLS decryption : handshake necessary?

I read some topics where people claim to be able to decrypt SSL/TLS communications just by having the private key of the recipient. But, I recently learned that a public key can, but should never ...
3
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0answers
426 views

Raspberry Pi (Raspbian) not capturing WPA2 handshake with Aircrack-ng [closed]

I've been using Aircrack for a short time now with my Alfa wfif adapter on my laptop and it's been working perfectly. However when I try and do the same thing on my Raspberry Pi it's having issues ...