Questions tagged [tls]

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

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1answer
67 views

Why isn't HTTPS enough to defeat an evil twin attack?

I am having a disagreement with a friend concerning how best to defend oneself against an evil twin attack at the local coffee shop, airport, or hotel. According to what I have read it is best to ...
1
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1answer
35 views

Mix and match RSA and ECDSA in TLS

Suppose TLS client and server want to communicate, authenticating both parties. They each have sufficiently trusted certificates, but one corresponds to an ECDSA private key and the other corresponds ...
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0answers
47 views

Offloading SSL for over ten thousand top level sites [on hold]

I have many sites (more than ten thousand) which have different domains but are served by the same application. For example http://firstDomain.com , http://anotherdomain.it, and http://...
0
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1answer
19 views

Exported certificate mismatch with this from proxy connection

I regenerate certificate on burp, restart it, export from burp, import to firefox and passing requests thru burp then I have "MOZILLA_PKIX_ERROR_MITM_DETECTED" where after checking serial number and ...
2
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1answer
48 views

RSA key size in TLS ciphersuite with RSA key exchange

I'm using the TLS cipher suite TLS_RSA_WITH_AES_256_CBC_SHA56. The Public Key of the Server's Certificate is RSA (2048 Bits) I understand that the RSA algorithm is used here for for key exchange, as ...
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0answers
51 views

Additional Encryption of SSL certificate and Public key before handshake?

I am currently working on a security-based product (VPN) and we have one critical requirement that I am unable to figure out. The connection between the User and the VPN server is based on the OTP (...
0
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2answers
52 views

Can certificate pinning be achieved strictly at the network layer?

With a client side java application that interacts with the server over http, is it possible to handle certificate pinning strictly at the network layer? Meaning, if the certificate is pinned on a ...
-1
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2answers
43 views

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 ...
0
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1answer
87 views

How can I distribute highly confidential keys for a symmetric cipher?

Say I want to exchange a key with someone for a symmetric cipher (say AES) without meeting them in person. What would be the most secure way to do this over the Internet? My first instinct would be ...
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3answers
139 views

TLS and reverse proxies

Hypothetically speaking, let's say I purchase the domain eve-mail.com and get a cert via LetsEncrypt. I then use a reverse proxy to point to the reputable and widely used alice-mail.com. Connecting ...
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4answers
90 views

Https POST Request for POST Parameters

im looking to allow a previously GET request of a url like: myurl.com/site/id/1 where the value 1 in this case - is a pseudo random and not too difficult to guess. I'm looking to bring this id/1 key/...
0
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1answer
70 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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0answers
45 views

EAP-TTLS and EAP-TLS in RADIUS: Which is more accepted?

From what I understand: EAP-TTLS forces the RADIUS server to identify itself to a client with a certificate, but optionally a client to the server. All information about an end-user is encrypted ...
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1answer
58 views

How does client authentication work when using a TLS Proxy?

We're using a load balancer, which implements TLS interception for a server, which in turn uses TLS Client authentication. Since TLS interception implies that the client will make the connection to ...
2
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1answer
68 views

SSL MITM Proxy Security - Can we rely on it?

In my organization, we have an SSL MITM (Man-in-the-middle) proxy (like ZScaler proxy). If I browse an HTTPS website and check the certificate, I can see that the proxy has issued a separate ...
1
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1answer
47 views

TLS key exchange and certificate subject public key clarification

This question is similar to this one, so let me elaborate what I'm struggling with. I want to get the length/strength of the key used by the server during the key exchange and authentication, i.e. ...
0
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2answers
99 views

I work with a company and another developer posted this and wanted us all to run it. i'm noob with things like this [closed]

I don't really trust the guy and i'm trying to take my time to learn everything about it, but what do you guys think? generate_ssl.sh #!/bin/bash name=ourwebdomain.local openssl req \ -new \ -...
0
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1answer
68 views

Does TLS protect against a man-in-the-middle masquerading as the client?

A message authorization code is used in TLS to prevent man-in-the-middle-attacks that involve tampering with the contents of the packet in-flight. However, there is one specific attack which I don't ...
3
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1answer
122 views

How to verify my connection is not going through MITM proxy?

I realized the issue a MITM proxy can pose to my privacy and I started to dig into it more to see how to detect it as a client. Things I know to check so far are: Checking who issues the certificate ...
0
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1answer
74 views

What is the meaning of this TLS output: TLSv1.2 (OUT), TLS alert, Client hello (1)

I'm downloading a small sample tar file using curl and outputting verbose log to see the details: curl -v -H 'Connection: close' https://ftp.gnu.org/gnu/gcc/gcc-2.95.1/gcc-objc-2.95.1.tar.gz > /...
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0answers
48 views

How does the “TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256” cipher suite work with RSA Signature Algorithm during TLS communication? [duplicate]

I see that facebook using ECC public key but the CA signed using RSA private key.While connecting to facebook it uses TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256. Here the Authentication algorithm is ...
1
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1answer
61 views

Extracting openssl pre-master secret from nginx

I have to store pre-master keys for all TLS connections due to regulator request. We are using nginx to terminate TLS. I've read Extract pre-master keys from an OpenSSL application and especially ...
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0answers
35 views

Install SSL for a site in IIS 8 when you have a certificate.txt file and private key file [migrated]

I have two files. File whose contents start with -----BEGIN CERTIFICATE REQUEST----- File whose contents start with -----BEGIN PRIVATE KEY----- How do I use these two files to create a SSL for a ...
0
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1answer
28 views

Openssl not showing complete certificate chain

Tried following openssl command to show the certificate chain,but the ROOT certificate 'depth=2 OU = GlobalSign Root CA - R2, O = GlobalSign, CN = GlobalSign' is not shown in the output...Why? ...
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0answers
45 views

Openssl using the cipher parameter result in handhsake failure

When i use Openssl to connect to facebook.com I see 'ECDHE-ECDSA-AES128-GCM-SHA256' ciphersuite used. openssl s_client -connect www.facebook.com:443 SSL handshake has read 3280 bytes and written 373 ...
2
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3answers
172 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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0answers
54 views

OpenSsl and self-signed certificates - verifying a chain [migrated]

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 ...
2
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1answer
169 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
20 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
48 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 ...
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1answer
48 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....
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1answer
91 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
110 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
25 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
1k 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
51 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
68 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
43 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
93 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
45 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 ...
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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
104 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
199 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
86 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?
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1answer
52 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 ...
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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
57 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 ...
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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 ...