Questions tagged [cryptography]
The cryptography tag has no usage guidance.
63
questions
0
votes
0
answers
22
views
How do TOR nodes select the CircID's when creating, or extending, a circuit?
I am coding my own version of TOR and I am trying to set up circuit management. I looked at the TOR spec and it says:
To prevent CircID collisions, when one node sends a CREATE/CREATE2
cell to ...
- 1
0
votes
0
answers
52
views
Why should I disable insecure SSH hostkeys if I never plan on using them?
A number of articles suggest removing insecure (broken) SSH key types in order to have a more secure server. In practice, if I only connect to the server with secure key types, why should I bother ...
0
votes
1
answer
599
views
Disabling reneg-sec on openvpn
I'm using a kylemanna/openvpn image (Openvpn 2.4) with default settings and I've noticed that each client disconnects for 1 minute every 1 hour. I believe it's connected to reneg-sec, which defaults ...
0
votes
0
answers
579
views
How is setting the system-wide cryptographic policy for Java supposed to work?
When migrating a proprietary Java (and Jetty) based application from RHEL7 to RHEL8 I learned something new: At least with OpenJDK 11 the JVM still defaults to a 1024 bit Diffie-Hellman group unless ...
- 435
0
votes
1
answer
122
views
Understanding SSH Public Key Auth Ciphers
I have a technical recommendation for SSH that states we should only use the following algorithms for Public Key authentication. Unfortunately the guide does not mention the exact names of ciphers as ...
- 17
0
votes
1
answer
556
views
Docker container CMAKE gives crypto/fips/fips.c:153: OpenSSL internal error: FATAL FIPS SELFTEST FAILURE - dracut-fips crypto.fips_enabled = 1
Getting crypto/fips/fips.c:153: OpenSSL internal error: FATAL FIPS SELFTEST FAILURE when
dracut-fips package is installed and sysctl -a shows crypto.fips_enabled = 1
Restriction: Can not disable ...
- 115
0
votes
1
answer
816
views
Create new SubCA certificate fails with NTE_PROV_TYPE_NOT_DEF
I am trying to manually create a key and CSR for a new Windows AD CS Enterprise Subordinate CA (Windows Server 2019).
I'd like to store the key in the modern Microsoft Software Key Storage Provider.
...
- 6,910
1
vote
1
answer
1k
views
Windows Server 2012: how to prevent IIS from choosing SHA-1 for connections?
The problem: IIS on Windows 2012 picks SHA-1 algorithm when the client uses SHA-1 certificate. Even though the server-side certificate is SHA-256. So Chrome/Edge don't work.
On analogous Windows 2016 ...
- 249
0
votes
0
answers
164
views
Are there any Operating Systems or Browsers that still depend on having these Ciphers enabled?
Doing a litle Cryptography Research and hit a case of conflicting data so wanted to try here.
I'm running a Web Service and currently support these 2 Ciphers:
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0X9F)...
-5
votes
1
answer
59
views
Which mobile VPN type, of IPSec, SSL/TLS, and SSH, would be better for travelling workers? [closed]
Not too sure on the specifics of each that would make one better for travelling.
- 1
0
votes
1
answer
27
views
How to list all of the known root keys in docker (Docker Content Trust)
How can I list all of the Docker Content Trust root keys on my system?
I am setting up a CI process that will use the debian:stable-latest docker image to build my application's releases in ephemeral ...
- 679
1
vote
1
answer
408
views
What is the difference between the TVOCache and the URLCache in Microsoft CAPI2?
In the CAPI2 log, I'm seeing some CertVerifyRevocation events that have the location TvoCache and some that have the location UrlCache for the validation of the same certificate:
<Event>
<...
- 111
0
votes
1
answer
51
views
server host key usage problem
I have my server host key(private key) in Openssl format that i want to use for server authentication.
I prefer to use the trust model that client local database should associates each host name with ...
Prasad Roy
0
votes
1
answer
670
views
Digital Signature is not valid
I recently received a digital signed email from a friend and the certificate is issued by COMODO RSA Client Authentication and Secure Email. My problem is the thunderbird detect it as a "Not Valid ...
2
votes
1
answer
846
views
smart card for UAC only
I'm in the process of configuring USB Yubikeys as a smart card for our company so that staff can elevate to an admin account (added to the computer's local administrators group) by simply inserting ...
- 578
0
votes
1
answer
71
views
Two salts, One password [closed]
If I have two different MD5 password hashes with two different salts (the salts are known), is there any way to cryptographically deduce if the two passwords match? Other than brute force password ...
- 376
3
votes
1
answer
374
views
MySQL - SSL with ECDSA Private Key
Under the list of supported TLS cipher suites here, MySQL contains support for a number of ECDSA suites.
I tried to setup MySQL to use SSL with an ECDSA private key, but this does not appear to work:
...
- 133
1
vote
1
answer
3k
views
How to make sure TLS is using AES 256
I am trying to establish a secure TLS connection between my system and a third party API. Third party mandates that I have to use AES 256 for all communication, Now I have installed a X509 ...
- 113
1
vote
1
answer
180
views
Windows Server 2008 R2 - Cryptographic Operators group issue
I have a problem similar to this question: Windows 7 “Cryptographic Operators”.
I am attempting to add a cryptographic rule. When I get to the step to set the cryptographic algorithms I get an "...
- 11
1
vote
3
answers
4k
views
How is a self-signed certificate different from a certificate signing request?
From the wiki page for a Certificate signing request:
In Public Key Infrastructure (PKI) systems, a Certificate Signing Request (also CSR or certification request) is a message sent from an ...
- 269
0
votes
2
answers
289
views
Group Policy Preferences item-level targeting propagation
I'm using GPPs to deliver some registry values and grabbed these using the Registry Wizard tool. This has created a collection with folder structure underneath. I want to use Item-level targeting to ...
- 351
1
vote
1
answer
699
views
IIS RC4 vulnerability Windows Server 2012 R2
I need to disable insecure cypher suites on a server with Windows Server 2012 R2 to pass a PCI vulnerability scan. From the research I've done it seems this is to done in IIS with some registry ...
- 305
0
votes
0
answers
578
views
How to configure a Tomcat 7 TLS connector for maximum security
I'm trying to configure a Tomcat 7 TLS connector for best possible security. To test, I'm allowing the Qualsys test to run against my server.
However I keep failing on the following points:
...
- 901
-1
votes
1
answer
80
views
Secure access to a site using SSL sertificate
I need to implement secure access to the corporate site using SSL certificates. After long time of searching I've came to conclusion that there are 2 ways to do that:
creating own self-signed root CA ...
- 149
1
vote
1
answer
2k
views
TLS-PSK vs TLS-PKI
I have read that once TLS-PSK encryption is about equally secure as TLS-PKI. The level of security by both depends on the data entered to configure the encryption. Could you please confirm this?
...
- 117
-1
votes
1
answer
2k
views
Create random file with openssl [closed]
So I read this questionUrandom Alternative, but I am unable to make a comment there (without 50 rep) - therefore I open a separate question:
If I use this command instead of dd and urandom, how do I ...
- 119
2
votes
2
answers
2k
views
Integrating Apache with PKCS#11 device via engine_pkcs11 and OpenSSL
I have problem with mod_ssl exactly with SSLCryptoDevice directive. When I run command "openssl engine" returns all available engines including pkcs11 (libengine-pkcs11-openssl), but When I set ...
- 23
12
votes
6
answers
8k
views
Generate entropy for PGP key
I'm logged onto a VM remotely and trying to generate a 4096bit PGP key, it just hangs forever because there is no entropy and since I'm working through remote desktop it probably does not detect the ...
- 121
1
vote
1
answer
54
views
Does my SSL cert have anything to do with or say about the symmetric session key?
The answer found on this server fault thread is my jumping off point for this general topic: https://serverfault.com/a/313558
... and this question can be thought of as a follow-up to that answer.
...
- 11
1
vote
3
answers
3k
views
How to create a digital signature and verify it through a server
I am trying to find out a way to create a digital signature for the employees of my company and place it in a server from where they can retrieve them and attach it with any digital document (Office ...
- 111
0
votes
1
answer
69
views
After Updating to SHA2, private and public doesn't match
I've upgraded to SHA2 certificate, but after upgrading the new certificate key doesn't match my old private key.
Public key has changed after updating and it doesn't match to previous private key.
...
- 255
9
votes
3
answers
19k
views
How are Windows MachineKey Container File Name's Derived?
In the C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys directory there's an enumeration of Key Containers. The naming convention is <uniqueGUID>_<staticGUID> and I presume the <...
- 2,397
3
votes
1
answer
507
views
Deprecation of RSA-SHA-1 in DKIM keys?
I recently noticed that opendkim on my mail server is objecting to DKIM signatures from a client, saying their key is insecure. It may be that that's due to lack of secure DNS (confirmation?) but I ...
- 5,846
0
votes
0
answers
1k
views
Check for SSL Weak Ciphers SSL3_RSA_RC4_128_MD5, SSL3_RSA_RC4_128_SHA, TLS1_RSA_RC4_128_MD5, TLS1_RSA_RC4_128_SHA
I am getting a serve ready for PCI compliance, and have one area with crypto from apache with the following report:
Weak ciphers offered by this service:
SSL3_RSA_RC4_128_MD5
SSL3_RSA_RC4_128_SHA
...
- 1,140
0
votes
1
answer
411
views
Can't build crc32c(a nodejs package)
It's not really nodejs related.
It's a C implementation.
Firstly, while building, it exits with error: "warning: linux/if_alg.h: No such file or directory". Then I run yum install kernel-devel-{...
user239843
-2
votes
2
answers
202
views
Is uploading your openssh public key to ~/.ssh/ for a given user safe?
I like to upload my public key (eg: ~/.ssh/id_rsa.pub) to various servers that I connect to on various networks for work. I use this same public key on github. If I am on a shared user account and I ...
- 515
1
vote
1
answer
292
views
Cisco ASA crypto keys, SSH, and VPN
I'm new to the ASA and wanted to know if regenerating crypto keys on an existing ASA with established VPN tunnels could negatively affect the tunnels. The reason for wanting to regenerate crypto keys ...
- 123
2
votes
1
answer
261
views
Linux Kernel setup: is it good idea to enable everything in Cryptographic API?
There are several implementations for some algorithms, which use CPU instructions which may or may not be available on current system. Is it good idea to just enable (in kernel, not as modules) all of ...
- 565
3
votes
2
answers
361
views
how is a website certificate file cryptographically readable by windows?
I have a .crt file signed by a CA. I cat the file to see that it is ascii text. Yet when I double click on the .crt file in windows, it opens it up and somehow displays all the information that's ...
- 431
8
votes
1
answer
8k
views
Logging SSL ciphersuite used in Windows Server 2008 R2
Is there a way to see /log which cipher suites are (actively) being used to establish SSL connections on Windows Server 2008 R2?
Ideally on a per request basis, like an extra column in the IIS logs.
- 183
-1
votes
2
answers
3k
views
how to sign a binary in Linux? [closed]
I have a Linux device that needs to be able to perform a software update of some binaries that may be coming from an insecure source
I'd like to find a way to sign these binaries using a public/...
- 687
5
votes
1
answer
3k
views
Is there a way to see which groups/users have access to an RSA key container?
I used aspnet_regiis to create an RSA key container (machine container).
I want to secure it and I know I can use the -pa and -pr commands to specify access. But is there a way to see which ...
- 521
9
votes
2
answers
3k
views
Https for embedded devices, local addresses
I am trying to add https to the embedded devices I am working on. These devices are generally assigned local ip addresses and so cannot get their own ssl certificates. So essentially my question is ...
- 193
3
votes
1
answer
2k
views
Strong Cryptography in Solaris Zone
I'm trying to setup a Kerberos KDC on a Solaris zone but ran into a bit of a problem with the Cryptographic Framework on Solaris 10
even though the packages for strong encryption (SUNWcry & ...
- 2,229
1
vote
2
answers
861
views
virtual machines and cryptography
I suspect I'm a bit offtopic with the site mission, but it seems me more fitting for the question than stackoverflow
i'm in preparing to create a vm with sensible data (personal use, it will be a web+...
- 13
10
votes
1
answer
5k
views
md5sum returns a different hash value than online hash generators
On suse10
md5sum myname
gives md5 hash as 49b0939cb2db9d21b038b7f7d453cd5d.
The file myname contains string "ravi"
while some of the online md5 hash generators for the same string seem to give a ...
- 101
12
votes
2
answers
12k
views
Entropy on virtual machines
As you might know that it's not as easy to generate entropy on a virtual machine as on a "normal" pc.
Generating a gpg-key on a virtual machine can take a while, even with the correct tools.
There ...
- 403
5
votes
3
answers
404
views
PGP: on the web, what if everything was tampered?
I am trying to wrap my head around how Public Key Cryptography can really work in a secure manner.
From what I can gather, you go to example.com and download their PGP/GPG Public Key and add it to ...
- 63
14
votes
4
answers
8k
views
Validating signature trust with gpg?
We would like to use gpg signatures to verify some aspects of our
system configuration management tools. Additionally, we would like to
use a "trust" model where individual sysadmin keys are signed ...
- 43.2k
1
vote
1
answer
2k
views
apache2 SSL Diffie Hellman key sizes
How to make apache 2.2 in debian lenny use Diffie Hellman key exchange with keys larger than 1024bits?
I found a patch that theoretically adds this ability at Apache bugzilla but can't find any ...
- 6,351