Questions tagged [handshake]
The handshake tag has no usage guidance.
64
questions
1
vote
1answer
149 views
How is the MIC (message integrity code) generated in WPA2?
We know that in WPA2's four-way handshake, a MIC is generated in order verify the supplicant (client). But how it is generated? Is something hashed to get the MIC? The PTK (pairwise transient key) ...
0
votes
0answers
78 views
symmetric key generation in TLS 1.3
Am trying to understand the phase where the symmetric key is getting generating. From what I am understanding Diffie-Hellman is used to derive the symmetric key in TLS1.3
I am reading this tls ...
0
votes
1answer
121 views
What is the relation between “signature_algorithms” handshake extension and TLS ciphersuite
I am learning TLS handshake and find client/serve will negotiate a cihpersuite during client/server hello.
Usually, the last part of a ciphersuite is a hash algorithm, like SHA256 in ECDHE-ECDSA-...
1
vote
0answers
78 views
SSL Handshake in Android via Bluetooth Classic [closed]
I am working on implementing an Android App (client) which will be connected to Raspberry Pi (server) via Bluetooth Classic.
To make data transfer securely, I want to implement SSL encryption between ...
3
votes
1answer
98 views
Why can SSH negotiatie two different encryption and authentication algorithms?
I recently found out, that according to the RFC, SSH can negotiate two different cipher (and MAC) algorithms for server-to-client-encryption and for client-to-server-encryption (check section 7.1. for ...
0
votes
0answers
63 views
Automating handshake capture to decrypt 802.11 frames
Networking newbie here.
I am running some experiments on IoT devices for which I need to capture the handshakes of the devices on my network in order to decrypt the frames I obtain through monitor ...
0
votes
0answers
47 views
How does WPA MIC key protect its PSK variable during 4 way handshake process
Background: I had a hard time finding an answer to a simple question, about the very first communication between an AP and a client. In the 2nd packet delivered during the 4 way handshake process (the ...
0
votes
0answers
59 views
Private key vs encryption session keys: For what is the private key used when there are session keys for encryption? [duplicate]
I have read that the private key that the certificate owner/web server has (which is the corresponding private key of the public key presented on the certificate) is used to decrypt the data that the ...
-1
votes
1answer
64 views
Strong TLS parameters even though MITM is being performed
I am performing a MITM attack against my own network using bettercap and https proxy.
On my client-side I use the Google Chrome browser and navigate to https://webs.com
At the same time I use a script ...
1
vote
1answer
96 views
TLS- Key exchange for session keys. Why?
I have a question about the Key Exchange Algorithm used in TLS process.
I have read that the Key Exchange algorithm is used by client and server to exchange session keys.
Do the client and server ...
1
vote
1answer
52 views
Is it possible that a single handshake can have 2 TLS versions included?
I am seeing different TLS versions (1.3 and 1.2) in the handshake and intermittently it fails with this error:
TLSv1.3 (OUT), TLS handshake, Client hello (1):.
2020-05-28T14:44:00Z.664 [thread-...
0
votes
0answers
455 views
Not able to capture 4 way handshake using airodump-ng
I am not able capture 4 way handshake, I also tried manually disconnecting and reconnecting my device to the network in hope that airodump-ng will capture the handshake but no luck. I checked the ...
0
votes
1answer
360 views
How does client verify the certificate provided by the server which is signed by different intermediate CA
I am creating a c++ secure client-server application using openssl library. I am still not clear about some aspects of the SSLHandshake procedure
I have enabled Mutual TLS in-order verify the both ...
1
vote
0answers
57 views
How does BLE secure connection ensure man in the middle protection?
I understand BLE secure connection pairing mode is improvement over Legacy Pairing. The issue with legacy pairing was intial TK value can easily be bruteforce by an attacker.
In contrast, in secure ...
0
votes
1answer
417 views
What is the role of leaf certificate private key In TLS handshake [duplicate]
What is the role of leaf certificate's private key if this certificate is signed by the intermediate certificate's private key and the certificate signature will only be validated using its public ...
1
vote
0answers
57 views
How are symmetric encryption algorithms tracked once handshake is complete in common secure communication protocols?
My understanding is that most secure web communication protocols ultimately want to agree on a symmetric encryption algorithm to use for sending and receiving data. Once an algorithm is agreed upon by ...
0
votes
0answers
30 views
Where the certificate public and private keys take a place? [duplicate]
I was reading this topic which talks about the handshake process and key exchange
https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_7.1.0/com.ibm.mq.doc/sy10660_.htm
The article says that the ...
2
votes
0answers
43 views
Which messages are included in (D)TLS Finished message's verify_data field for session resumption
The https://tools.ietf.org/html/rfc5246#section-7.4.9 states which messages are included for PRF computation that is included in Finished messages
It is clear for 'regular' (initial) handshake
But ...
1
vote
1answer
91 views
TLS 1.2. Handshake: Where do Client and Server negotiate how the master key is built from randoms and pre?
I am currently trying to solve an exercise where I should look at a TLS 1.2 handshake trace while having access to pre and both randoms (server random and client random).
In order to decrypt ...
3
votes
1answer
132 views
TLS 1.2 Handshake: Does the server have to take all extensions sent by the Client?
I am unsure about how extensions are handled in TLS v1.2.
During the handshake, the client is able to add some extensions during ClientHello. As far I understood, the server can pick arbitrary ...
0
votes
1answer
94 views
Is Certification path construction algorithm needed for SSL/TLS?
In the TLS Handshake a Certificate message is sent. This message contains the (chain of) certificates needed to validate the provided certificate of the communicating party.
However, I have also ...
0
votes
1answer
274 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)...
2
votes
1answer
184 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 ...
1
vote
1answer
81 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 ...
2
votes
2answers
92 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 ...
0
votes
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?
2
votes
1answer
150 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, ...
0
votes
1answer
116 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?
1
vote
2answers
2k 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 ...
19
votes
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
votes
0answers
862 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 (...
1
vote
1answer
117 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 ...
0
votes
1answer
71 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
votes
1answer
135 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 ...
1
vote
1answer
877 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)...
3
votes
1answer
269 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 ...
-1
votes
2answers
1k 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 ...
1
vote
2answers
161 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 ...
0
votes
0answers
645 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 ...
0
votes
1answer
226 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?
0
votes
0answers
53 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
votes
1answer
305 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, ...
0
votes
1answer
288 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 ...
2
votes
0answers
87 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 ...
0
votes
1answer
2k 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 ...
2
votes
2answers
9k 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
votes
1answer
280 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 ...
1
vote
2answers
2k 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 ...
0
votes
1answer
100 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 ...
2
votes
0answers
232 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 ...
