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Questions tagged [ciphers]

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How do I fix: SSL/TLS: Report Weak Cipher Suites for Ubuntu Server [closed]

I ran a vulnerability scan and I got these results for ports 993, 995, and 5432. I am running Dovecot for POP3S and IMAPS and Postgres for port 5432. I got these results from the vulnerability scan: ...
3
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1answer
77 views

How to filter ciphers based on ssl certificate?

I have many ssl certificates. On one of the certificates I run the command openssl x509 -in cert.pem -text -noout it shows: Signature Algorithm: ecdsa-with-SHA256 Public Key Algorithm: id-...
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3answers
264 views

Losing the Initialization Vector in Cipher Block Chaining

I have written a message and encrypted it using cipher block chaining. What will happen if the receiver loses the Initialization Vector, or doesn't receive at all?
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1answer
133 views

Do ciphers and encoding schemes make passwords more secure?

I recently came across a tech professional advising a user to take some plaintext of their choice, run it through one of these ciphers, convert it to Base64, and then use the result as their master ...
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1answer
51 views

What's the difference between `aes-128-cbf` and `aes-128-gcm`?

We often hear of AES-128-CBF and AES-128-GCM, but what's the difference between them?
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1answer
50 views

What's the meaning of cipher's `IV Length`?

What's the meaning of IV length? there provide several stream ciphers, what's the meaning of IV Length? Name Key Size IV Length aes-128-ctr 16 16 aes-192-ctr 24 ...
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1answer
87 views

For a cipher school challenge I need help breaking this cipher [closed]

[CIPHERTEXTSTARTS]HI wsndtonInehbihs if at t iyoncniegtrf .e noionbpni y,iu.w ahoui hs hroyh!euecsy m.ot ew hrc hb;ntsresnmdma ipMsat ln ts , ryiceg ensh c n byr t k t oe de uhw stiytoer s ...
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0answers
24 views

Whether cipher suites is related to public key certificate? [duplicate]

I want to use TLS version 1.2 and Authenticated Encryption with Associated Data (AEAD). Can a public key certificate obtained from a certification authority specify which of the ciphers I can use? ...
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1answer
41 views

OpenSSL Padding Oracle. Specific Ciphers on apache2 seems a little limited

I've seen a lot of articles giving the official explanation on how to prevent OpenSSL Padding Oracles, Usually all of them state that its CBC cipher suites that leave you vulnerable. The following ...
2
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1answer
540 views

What is a “non-stitched” ciphersuite?

From the OpenSSL Security Advisory - 0-byte record padding oracle (CVE-2019-1559) In order for this to be exploitable "non-stitched" ciphersuites must be in use. What is a 'non-stitched' ...
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1answer
71 views

Cipher that does not give confirmation whether decryption is successful

I was reading this question where the author wanted to know whether layered encryption would be better than a long password. The answers to this question all said the same thing: It would be easier ...
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1answer
302 views

How to disable obsolete/insecure TLS_RSA ciphers to harden Chrome? [closed]

Multiple vulnerabilities have basically obsoleted TLS_RSA, CBC and QUIC implementations. February 9, 2019: "Seven researchers from all over the world found --yet again-- another way to break RSA ...
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choosing a cipher suite for sending a simple email on embedded systems

Anybody have any input/feedback on this. I've been given the task of researching how to send a 'secure' email using SSL on an embedded system with very limited RAM and Flash ROM. The email is very ...
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3answers
177 views

What are the 'P' values in some cipher string?

Most of the cipher strings I see are in the format: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 ...
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1answer
57 views

Why are ciphers using DSS being offered when using DH+AES:!DSS?

When I run the following command on Windows 10 with OpenSSL 1.0.2p installed I receive a curious result back (Formatted for readability): openssl ciphers "DH+AES:!DSS:!aDSS:!aNULL" DH-DSS-AES256-GCM-...
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2answers
273 views

Apache TLS with only ECDHE-RSA-AES128-GCM-SHA256 enabled

Is there anything against this TLS-configuration in Apache: SSLProtocol TLSv1.2 SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256 There are lots of examples that use a more complicated setup, but I believe ...
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2answers
572 views

Cipher Suite TLS 1.2 - Weak in OHS

I am trying to correct weak encryption in TLS, by doing a test in SSL Labs, it throws weak encryption in the following chpher suite: Current Configuration: SSLCipherSuite HIGH:!MEDIUM:!LOW:!aNULL:!...
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2answers
156 views

How are ciphers related to cryptographic algorithms like DES or AES?

It looks like I am having a terminology issue here. In cryptography, we have stream ciphers and block ciphers. I understand their difference. We also have cryptographic algorithms like AES (Rijndael). ...
1
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1answer
681 views

Why would TLSv1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA still be used?

First, I may be asking a dumb question. I am trying to learn, so please, take it easy on me. Second, if this is not the right place for this question, or you can link me elsewhere, please tell me/ ...
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1answer
68 views

Could this list of ciphersuites be improved on?

During my self-teaching about trying to find mobile application vulnerabilities, I found a list of cipher suites that are/were considered insecure: md5 sha1 sha-1 md4 rc4 des tripledes 3des If I ...
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1answer
250 views

How do you find the key domain of the multiplication cipher efficiently?

If the plaintext is made of both letters (a to z) and digits (0 to 9), how do you find the key domain of the multiplication cipher?
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1answer
112 views

Understanding Cipher suite prefixes

I have been lately reading cipher suites and how it works. I figured how it works in the web servers and there is a doubt regarding the prefixes used in the order. How are RC4-SHA and RC4+SHA ...
0
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1answer
915 views

Understanding SSL Cipher suite in Apache

On reading the documentation Apache documentation. A cipher suite example has been given : RC4-SHA:AES128-SHA:HIGH:MEDIUM:!aNULL:!MD5 I have understood the explanation given by them. My question is ...
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1answer
105 views

Are the cascading ciphers in Veracrypt susceptible to the meet-in-the-middle attack? (MITM)

Veracrypt offers cascades of ciphers. Are these cascades (at least those comprised of two ciphers) susceptible to the meet-in-the-middle attack? Why not? For example: AES-Twofish Two ciphers ...
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1answer
1k views

Clarifications regarding ciphers and Nmap scan

I'm running the below Nmap command to test the strength of the cipher suites I have used in my host nmap -sV --script ssl-enum-ciphers -p 443 <host> The Nmap doc says that Each ciphersuite is ...
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1answer
328 views

Are ciphers with a strength of 112 bits considered weak?

SSL/TLS Ciphers of strength 128 bit is considered strong while ciphers of strength 112 bits is considered weak. Ciphers of 56 bit is understandably weak as they can be easily brute-forced. If it is ...
2
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1answer
343 views

SSL - Enabling Forward Secrecy with or without RC4

I'm running an Apache 2 server with Ubuntu 16. Here's my current configuration: SSLProtocol All -SSLv2 -SSLv3 SSLHonorCipherOrder on SSLCipherSuite I'm a bit confused as to what I should use for ...
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2answers
344 views

does anyone know how this text is encrypted? [closed]

Im trying to solve a copher challange, but i have no idea on this question. does anyone have any ideas on the encryption method used here? Dvoo wlmv, blf'ev hloevw xrksvi xszoovmtv mfnyvi gdl. Gsrh ...
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2answers
125 views

How attackers extract data from cipher text using brute force?

Lets take an example. Plain text: HJOU UT Cipher text: IKPV VU Above one just a simple substitution technique. Data is random text. If attackers substitute -1 then they will get GINT TS. Otherwise if ...
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1answer
1k views

Google Chrome weird random Cipher Suite

This websites gives you information on the SSL cipher suites your browser supports for securing HTTPS connections. If you browse it with Google Chrome, you'll probably see some weird Cipher Suites in ...
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1answer
473 views

OpenVas remediation cipher suites

This is my first time running a vulnerability scan software like OpenVas. It is really a great tool to found out about vulnerabilities in the network. I have found difficult to troubleshoot the ...
0
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1answer
103 views

Is EV (Extended Validation) Certificate Green Bar Affected by Available Cipher Suites?

I am wondering whether Extended Validation (EV) Certificate 'green bar' on the web browser is affected by Cipher Suites. I can't find seem to find a reference that says that apart from this answer. ...
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1answer
351 views

Is TLS_ECDHE_RSA_WITH_RC4_128_SHA secure?

I was wondering whether TLS_ECDHE_RSA_WITH_RC4_128_SHA is secure. We have added it within the ciphers tag of the Tomcat configuration file.
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1answer
749 views

How to decrypt a text with substitution cipher? [closed]

I recently got a file which I had encrypted with substitution cipher a long time ago. I went to crack down the key and almost got it. But I encrypted it not just with alphabets but also with numbers ...
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1answer
468 views

What are the benefits and disadvantage of disabling <TLS1.2 client side (in browser)?

We are considering disabling TLS1.0 and TLS1.1 in the policies for a browser used organization-wide. We already have a primary browser, where >=TLS1.0 is enabled (i.e. SSLv3 is disabled). We do not ...
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0answers
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SSL/TLS cipher suites order for Windows 2016 hosted https sites

We are SaaS & IaaS provider that predominantly use Windows 2012 (R2) for hosting. We have started evaluating Windows 2016 OS and noticed our sites are no longer accessible via Chrome / Firefox (...
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1answer
696 views

openssl PSK cipher support

openssl version on ubuntu machine is $ openssl version OpenSSL 1.0.2g 1 Mar 2016 Following is openssl PSK cipher list :- $ openssl ciphers -v 'PSK' PSK-AES256-CBC-SHA SSLv3 Kx=PSK Au=...
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1answer
1k views

selft signed certificate for AES128-GCM-SHA256 cipher

To generate self signed certificate for AES128-SHA256 cipher using openssl, following commands are used. AES128-SHA256 cipher commands :- openssl genrsa -aes128 -out 1.key 2048 openssl req -...
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2answers
295 views

What would be a better encryption algorithm then RSA_DES_EDE3_CBC?

First off, please let me explain why I'm asking this at all: The default implementation of EnvelopedCms is using AlgorithmIdentifier which by itself will use RSA_DES_EDE3_CBC or OID 1.2.840.113549.3....
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2answers
119 views

Using old ciphers in email security

My email provider still supports old SSL_RSA_WITH_RC4_128_SHA ciphers. What does that mean for me? If I use an updated system (Ubuntu 16.04) and an updated client (Thunderbird 52), shouldn't it use ...
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2answers
2k views

Role of the chosen ciphersuite in an SSL/TLS connection

When it comes to a secure TLS configuration (e.g. for HTTPS), the topic is prominently about the supported cipher suites. I want to fully understand which part of the cipher suite has which role in a ...
2
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1answer
495 views

How to disallow specific ssh ciphers and/or MACS (blacklist approach)

I have a report detailing weak ssh ciphers on a system. How can I dis-allow these specific weak ciphers. The common solution which I am aware of is adding the following lines in sshd_config (which is ...
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2answers
92 views

Given the following yaSSL ciphers, how do I know what's being used?

Scope: I am considerable new on cryptography and only know some basic fundamentals of it. Looking at yaSSL ciphers I am trying to, as an exercise, to figure out which ones are still safe to use by ...
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1answer
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Secure communication between peers with ANON ciphers and password authentication

Using ANON ciphers (No certificates required/used) while establishing connection and later using the username/password for authentication considered secure communication? Are there any flaws in it, ...
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1answer
72 views

Changing cipher list of a ctx object after connection establishment

Does changing the cipher list for a CTX object (using SSL_CTX_set_cipher_list), have any effect on the already established connections (connections that had used that very CTX object)?
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1answer
232 views

Cipher with mixed case, numbers, hyphen and period [closed]

Given the following cipher text: LE-eheadty.AC2lta oiwyGC24 What possible ciphers could it be?
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1answer
460 views

How to make TLS_RSA_WITH_3DES_EDE_CBC_SHA strong

First off I have NO idea what ciphers are and my knowledge is very basic in security! With that said, from this tutorial I have established a secure SSL site and I have a ran a test on my domain and ...
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2answers
2k views

What is the most robust available algo for GPG symmetric encryption? [closed]

What is the most robust available algo for GPG symmetric encryption (given as argument of --cipher-algo)? Possible ciphers: IDEA 3DES CAST5 BLOWFISH AES AES192 AES256 TWOFISH CAMELLIA128 ...
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1answer
236 views

what is wrong with openssl ciphers?

I used openssl recently and noticed that in the cipher list there is AES (what else ) and then I saw many rarely used ciphers like camellia and seed, then I saw stuff like rc4, rc2 ... Why are ...
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1answer
2k views

Apache naming for TLS_RSA_WITH_3DES_EDE_CBC_SHA

According to NIST and HIPAA guidance, I miss one cipher on a new web server: TLS_RSA_WITH_3DES_EDE_CBC_SHA Despite I read this one is discouraged, I am curious as to how do I add it? I am on Linux ...