Questions tagged [cryptography]
The cryptography tag has no usage guidance.
67
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Host Key Exhange failing on AWS Transfer Family SFTP
I have a customer who is unable to connect to an SFTP Server (AWS Transfer Family SFTP).
The error I am getting in my logs is:
ERRORS KEX_FAILURE Message="no matching host key type found" ...
- 101
9
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2
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1k
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AWS Graviton Processors: which encryption specs are hardware accelerated?
In testing Graviton instances there seems to be significantly more CPU overhead from AES/SHA functions compared to the same on cheaper/smaller Intel/AMD instances. Do these procs supports hardware ...
- 281
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Windows Server 2022 does not enable BrainpoolP256r1 ECC curve
I want to enable the ECC curve BrainpoolP256r1 on a Windows Server 2022.
expected bahavior
brainpool curve is added with enable command:
PS C:\> Get-TlsEccCurve
curve25519
NistP256
NistP384
PS C:\&...
- 101
0
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1
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768
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PHP openssl encryption aes-256-cbc and decryption using NODEJS
I have a PHP script used to encrypt data with openssl_encrypt() and the aes-256-cbc algo.
Encryption/Decryption works well using PHP, it's an old script.
I've been trying to decrypt the datas using ...
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33
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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 ...
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0
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0
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110
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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
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1
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3k
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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 ...
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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 ...
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1
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396
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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 ...
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1
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831
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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
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1
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2k
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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.
...
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1
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1
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2k
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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 ...
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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)...
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-5
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1
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65
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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.
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48
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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 ...
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1
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1
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568
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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
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1
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75
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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
1
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1
answer
876
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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 ...
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2
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1
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1k
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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 ...
- 588
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1
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84
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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 ...
- 406
3
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1
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465
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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:
...
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1
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1
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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 ...
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1
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210
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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 "...
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3
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4k
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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 ...
- 317
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2
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431
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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 ...
- 361
1
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1
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823
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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 ...
- 315
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0
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620
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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:
...
- 933
-1
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1
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84
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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
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1
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2k
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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?
...
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1
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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 ...
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2
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2
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2k
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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 ...
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12
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6
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9k
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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 ...
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1
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55
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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.
...
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3
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4k
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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 ...
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70
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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.
...
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3
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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 <...
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1
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693
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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 ...
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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
...
- 1,150
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431
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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
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2
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206
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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 ...
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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 ...
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2
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1
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269
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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 ...
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2
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370
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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 ...
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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.
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2
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3k
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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/...
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1
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3k
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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 ...
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2
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4k
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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 ...
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1
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2k
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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 & ...
- 2,369
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2
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872
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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+...
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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 ...
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