Questions tagged [tls]

SSL (Secure Sockets Layer) and/or TLS (Transport Layer Security)

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3answers
150 views

Ensuring all network services on a device use strong TLS cipher suites

(This is hypothetical, but based on a real-life problem I've had) Context: I am developing an (embedded) device which includes a few exposed network services. I'm responsible for security, not ...
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1answer
51 views

OpenSsl and self-signed certificates - verifying a chain

I have a chain.pem -----BEGIN CERTIFICATE----- // My server cert signed by intemediate CA -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- // My intermediate cert signed by root CA -----END ...
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0answers
55 views

How can I call an API that requires TLS 1.2 when my http client can only support TLS 1.0?

We have an application written in PLC Structured Text using the B&R Automation Studio. This application needs to send HTTP requests to an external API server that only supports TLS 1.2. According ...
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1answer
130 views

Why are many Security sites not using HTTPS?

I've seen a lot of websites by security teams & companies which use HTTP instead of HTTPS. I'm using HTTPS Everywhere and have found even some medium-big groups not using HTTPS. I'm a noob at ...
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0answers
15 views

Can someone explain the significance of Certificate Signature algorithm in the selection of Cipher suite in a TLS communication? [duplicate]

Can someone explain the significance of Certificate Signature algorithm in the selection of Cipher suite in a TLS communication?
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0answers
43 views

Determining clients connecting to IIS using CBC ciphers. (preparing for Lucky13 remediation)

I am trying to determine the impact of re-mediating a lucky 13 vulnerability; which i understand requires disabling CBC cipher modes. So far i have added custom logging to my IIS instance to capture ...
0
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1answer
43 views

Replacing revoked SSL with a new cert but domain still showing old revoked cert

I bought and installed a SSL cert for my domain but then changed my mind and canceled the purchase and bought a slightly cheaper one. The old cert is then revoked and I proceed to install the new cert....
1
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1answer
81 views

TLS 1.0 Deprecation and Mitigation Tactics

With the deprecation of TLS 1.0 on the horizon, I'm curious how others are handling connectivity and mail delivery issues for dated client environments. Lets face it, there are more environments live ...
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2answers
101 views

Using unencrypted protocols with IoT devices

Old IoT devices and some low-power devices are not capable of doing encryption or use weak encryption methods like TLSv1.0. What could be the risks of using such devices and unencrypted protocols like ...
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3answers
4k views

How to decide whether an eshop is safe or compromised

So, I am having this issue where I want to buy a specific wacom product but their online store eu-store.wacom.com and us-store.wacom.com, even though it is being accessed through https, does not ...
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0answers
22 views

Verifying Public Key Using The Digital Signature on Mac

I have just started with encryption and stuff, so please bear with me. Just playing around. I have an upstream service that has sent us a self-signed cert. Now from what I understand, we can verify ...
9
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2answers
990 views

Trying to understand how Digital Certificates and CA are indeed secure

I understand that Digital Certificates and Certificate Authorities (trusted 3rd parties) help prevent man in the middle attacks during HTTPS connections. However, I am confused on a few details. Let'...
2
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1answer
50 views

Is it possible to detect the application level protocol in a TLS tunnel without interception?

Consider a proxy that doesn't intercept TLS, but allows CONNECT tunnelling, but only to limited ports (eg: 443 only). If someone runs an ssh server on port 443 and connects to it using CONNECT, would ...
2
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2answers
64 views

Does TLS have any way of exposing only the URI in a SSL-SSL proxy, or BlueCoat style appliance?

I'm writing an experimental authentication protocol and need to see the unencrypted URI's of the HTTP Call, but want to provably show that I can't see the data. Does any standard, or feature exist ...
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0answers
40 views

How to specify maximum allowable client clock skew for SSL/TLS

I am investigating the possibility of testing a system which relies on SSL/TLS with a client which, for testing purposes only, has a very different clock time, at least several weeks different from ...
1
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1answer
60 views

Extracting openssl pre-master secret from apache2

I would like to be able to decrypt my server's https traffic for debugging and analysis. My server is a debian 9 Apache2 server running mod_wsgi and django. I have seen this post: Extract pre-master ...
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0answers
40 views

Define ncat set ssl version from client

I am trying to use ncat from Kali to connect to another ncat instance running on Windows 7. The exercise requires the use of SSL. The Windows instance is using ncat v5.59BETA which does not support ...
0
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1answer
53 views

Are all web servers for a domain wildcard certificate supposed to have the same private key?

If I have three web servers that all have the same CSR based on a domain, *.domain.com, does that mean all the servers have the same private key? I know it's a short question, but I am not sure of ...
0
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1answer
72 views

Is ssh tunneling to remote server Php admin secure?

I have not been able to find an answer online so I thought I would ask here. I have setup an Amazon Lightsail instance to act as a development platform for my website. I have setup SSH for accessing ...
3
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2answers
98 views

What is Multi-Perspective Validation?

The Let's Encrypt upcoming features page lists the following: Multi-Perspective Validation Currently Let’s Encrypt validates from a single network perspective. We are planning to start ...
5
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2answers
178 views

How does Tor protect against MITM attacks between the client and relay nodes?

According to robertheaton.com: When a Tor client constructs a circuit, it negotiates TLS sessions with each of the nodes it has chosen for its circuit using the nodes’ TLS certificates and public ...
0
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1answer
81 views

Why does a VPN prevent snooping when https already encrypts the traffic? [duplicate]

Why use an additional VPN (to prevent against snooping) if https is already encrypted? Is it solely for an additional layer so snoopers need to decode the data twice?
1
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1answer
45 views

Is this a threat if website to connect to is in clear in the TLS SNI extension or when using an HTTP proxy?

As per my understanding, after the TCP three-way handshake we send a TLS ClientHello which has the SNI field in clear text and anyone can see which website I am trying to connect to. Isn't it a ...
0
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0answers
48 views

Is client-side password hashing still useful when using TLS? Is TLS crackable? What about PFS? [duplicate]

Is client-side password hashing still necessary / useful when using TLS? What about TLS protocols with PFS (perfect forward secrecy) like Diffie-Hellman? Let’s say that I’m running a web application ...
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0answers
54 views

nonce encryption in https

I am thinking about using nonce and secure request to API Server. Is this the right implementation for using nonce? PURPOSE Protect API Server from Replay attack Protect API Server from MITM attack ...
19
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3answers
4k views

Are certificates without DNS fundamentally flawed?

I am new to security work and I am implementing someone else's design. The design calls for a TCP server with TLS in an environment where there is no DNS - only IPs. I am working with a typical ...
18
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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 ...
1
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1answer
69 views

End-2-End and server to server encryption over home network

I am setting up a private home management system containing several daemons/servers and a few clients to connect from. I am trying to achieve end-to-end encryption with the most monitoring and health ...
1
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1answer
88 views

Why do 256 bits SSL certificate show “256 bytes” for key size?

I've seen many places refer to "256 bits certificates" in SSL encryption. Assuming they are talking about the key size, when I look at these certificates in browser I see 256 bytes instead. I know 1 ...
1
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1answer
127 views

Why is it okay to run NGiNX or Apache Web Server as root on port 80/443 and not your app directly?

Just like the title says, I would like to understand: what are the implications of running a custom app (like node or flask) on port 80/443. Is running a reverse proxy like Nginx mandatory from a ...
0
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2answers
43 views

What is the use of private key of a SSL certificate? [duplicate]

I have read a few wrong information about HTTP/SSL (I think) and those information was saying that the private key from a certificate is used for message decryption. I have followed a tutorial on ...
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0answers
23 views

Talking TLS with EC cryptography and the secp256k1 curve [migrated]

How reasonable would it be to speak TLS over the secp256k1 curve? My initial experiments show that OpenSSL supports it (albeit with special flags, see below): Running an OpenSSL client against an ...
2
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1answer
137 views

Is it dangerous to add a custom cert authority to a browser?

For example if my friend develops a webapp with a custom cert and I add them as CA to my browser, can they do any damage? I mean for example somehow faking certs and stealing my banking password, etc.?...
3
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1answer
57 views

Should the Strict-Transport-Security max-age be tied to the duration of the certificate?

I understand the principle of HSTS, and the fact that the choice of max-age limits how long a visitor could potentially be locked out if the site somehow lost its certificate and had to go back to ...
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0answers
45 views

Read HTTPS data ? decode HTTPS? [duplicate]

I've create a RogueAP with my RaspberryPI. With this cool tool i'm able to intercept HTTP authentification : https://github.com/DanMcInerney/net-creds For the next level i want to try to intercept ...
0
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0answers
110 views

Intercept mobile traffic using burp

I'm trying to intercept a mobile traffic of an android app I built using burp suite. I connect the mobile device to burp proxy, and install the CA. But I get a protocol error message, and couldn't see ...
1
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2answers
81 views

Can I get an SSL certificate even if external DNS does not resolve

I have an intranet website that requires an SSL Certificate. From what I've seen it seems like this is difficult to accomplish or cumbersome. Would I be able to buy an SSL certificate if there is an ...
72
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1answer
15k views

How can Kazakhstan perform MITM attacks on all HTTPS traffic?

There is now MITM on HTTPS traffic in Kazakhstan. But for MITM to work, other than installing the certificate, there has to be someone proxying the request, right? Will that role be played by the ...
1
vote
1answer
89 views

Self Signed Certificate in Certificate of Chain [closed]

I setup an internal Root CA with another Intermediate CA, which will issue and sign the certificates for other internal servers. When I did the "openssl s_client -connect :443" it shows the error ...
2
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2answers
177 views

Does changing DNS help prevent MITM on ISP level?

A few days ago Kazakhstan gov-t passed a law to enforce using gov-t signed SSL certificates on all https traffic on all (almost) ISPs. So when you visit https://google.com your browser will warn that ...
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0answers
37 views

In AWS EKS, how should Kubernetes certificates be generated?

This article from 2018 states (emphasis mine): It is common practices for Kubernetes clusters to self-signed their digital certificates. I often get from Security Practictioners the hairy eyeball ...
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0answers
25 views

How can TLS/HTTPS remain secure if the entire transmission is monitored? [duplicate]

Okay, so I'm pretty sure this question comes from a fundamental misunderstanding of how HTTPS works, but here goes: Say that someone has hooked into the "internet line" coming from your home so that ...
6
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2answers
218 views

State forces installation of SSL root CA, how to evade / mitigate?

Kazakhstan has forced all users in its territory to install a state-issued SSL root CA certificate "aimed at enhancing the protection of citizens, government bodies and private companies from hacker ...
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0answers
32 views

Automating certificate management across a large number of printers?

Is there a way to manage certificates on a large group of printers that will install and renew them? It doesn't look like any of the fleet management programs will do this. How are these managed in an ...
1
vote
1answer
84 views

Serving local HTTP over VPN [closed]

I’m running a server on my LAN. It’s setup as a Webserver that’s only listening to local connections and a WireGuard VPN server. When I’m not at home, I establish a connection to the vpn. The ...
20
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7answers
5k views

Is encryption still applied if you ignore the SSL certificate warning for self-signed certs?

Would encryption still be applied on communication with devices using self-signed certificates if you ignore the warning and proceed without installing the certificate? Would you need to install it to ...
0
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1answer
55 views

How do I get the list of cipher suites supported in a specific TLS version?

Is there any cipher suites supported in one TLS version and not supported in the other? If yes, then is there any documentation that talks about the cipher suites supported in each TLS or SSL versions?...
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0answers
42 views

Can charles proxy (with root cert installed) intercept and read all traffic between mobile app and server? [duplicate]

I have a mobile app that queries various 3rd party API/sites (these are https links). I have a concern that SSL proxies (e.g. Charles) can be used to intercept the traffic - man in the middle. Are ...
0
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0answers
70 views

Is it safe to send an unencrypted password through https? [duplicate]

There's an endpoint that receives an e-mail and password and creates a user account in an external system. To access that endpoint, one must be logged in to our system as it's the only way for that ...
0
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0answers
20 views

Would a HTTPS protected URL be secure in the following circumstances? [duplicate]

I am looking at enabling a hosted phonebook provided by a hosted VOIP provider. The phonebook is hosted on a server. The phonebook is accessed via a username / password protected web GUI for ...