Questions tagged [public-key]

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Create a Root CA self-signed certificate using the command line

I have Microsoft Server 2019 offline Root CA I want to renew the Root CA certificate, but I do not want it to be used immediately (as I want to push out the new Root CA certificate to key stores on ...
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Fingerprint in PuTTY host key warning does not match EC2 key fingerprint

I rebooted my AWS EC2 instance, and now when I try to connect via SSH or FTP, I get the PuTTY warning about a potential security breach and that the host key doesn't match the one cached in the ...
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3 votes
1 answer
832 views

extracting a public key from an Ed25519 private key with OpenSSL?

Ed25519 private keys can be generated by doing openssl genpkey -algorithm ed25519 -outform PEM -out private.pem. My question is... using OpenSSL is there a way to get the public key from the private ...
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SSH connection with Putty : Server refused our key

I'm having quite a hard time with ssh keys. To explain the context, I'm trying to ssh my VM (my computer is the client and the VM on it is the server). For now, it works using password authentication ...
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SSH Login from Termius using HashiCorp Vault's Certificate based Authentication on any Linux Server

Can we able to login to the Linux server with Certificate Based Authentication (which is provided by Hashicorp Vault) through Termius ? I have a requirement to login through Public key and Private key ...
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passwd: Authentication token manipulation error using ssh and public key

I'm using ssh and public key (saved in my local computer) to connect to a HPC cluster as follows: $ ssh -i ~/narvi_key/xenial-narvi-key alijani@narvi.tut.fi Enter passphrase for key '/home/xenial/...
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92 views

ssh public key authentication with PAM

My Ubuntu servers are using kerberos auth for ssh with password failover using PAM. I'd like to add public key authentication as well. As I read that doesn't really work. Has anyone implemented this ...
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SSH connection on a redhat server

I have been struggling for the past few days trying to get an ssh connection working with a public rsa key on a redhat ftp server. I have been following guides such as this one with little luck:https:/...
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295 views

Unable to decrypt TLS data with wireshark

I have recorded some TLS encrypted data with tcpdump. Now, when I open this in Wireshark, I mostly only see gibberish data and I would like to decrypt it, to see what's going on. I have both, public ...
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542 views

How can I convert my plain text (r,s) signature to a format that openssl can verify?

I have my (r,s) in the following format: ["r","442ca7cb054a9862ed93848cc13e0134968eba79db89e0e6f9ded510149aacd1","s","...
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How could I do a list from an AWS account listing all running instances?

I'm using AWSCLI at Windows 10 Professional with GitBash. I need to have a list of all running AWS instances by account. Will start doing in an account to make a list to populate the public keys from ...
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WinSCP PuTTY key format too new [duplicate]

I am trying to connect to my server with WinSCP. I created a key by PuttyGen but when I am trying to connect to it by WinSCP it says that my PuTTY key format too new, Image of the error. Can somebody ...
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2 answers
6k views

How do I use the openssl command to decode a public key .PEM file?

I have my localhost TSL/SSL certificate from Chrome stored to a .PEM file. Was wondering how do I use the oppenssl command to decode it into a list of human-readable fields. Googling this only ...
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1 answer
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connect ssh key on server windows fail

I want to connect to a Windows server with an SSH key and if I connect via an SSH password, it's works, but if I via my SSH key, it fails I'm user on this server and my public key is %UserProfile%/....
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Bastion with private keys, jailed users and proxycommand

I want to setup a bastion for SSH and tunneling HTTP : let the user use a private key stored on bastion without having read access to it permit the use of proxyjump (or proxycommand) on the client ...
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OSX Big Sur SSH Public Key Location

On a new Mac-mini OSX Big Sur 11.0.1 I cannot find my public SSH key. It's not in ~/.ssh as that only has known_hosts Running the command find / -name "*.pub" -print does not find any ...
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1 vote
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387 views

ssh-keygen, is it possible same public key generated? (ssh public key duplicate)

Is it possible same public key generated? In the following example, the two keys(test1.pub, test2.pub) created are different public key. $ ssh-keygen -C IsItPossible Generating public/private rsa key ...
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WIndows 10 ssh public key auth - server does not accept public key

I'm having both client and server running Windows 10, and did the steps according to the following guidelines in both client and server(ssh-keygen, put pub key in server auth keys file...): Key-based ...
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Putty Private/Public Key Pair - Generate Certificate

I have generated a private/public key pair using Putty. I have a private key file with extension .pem and public key file with extension .pub. Now I want to create a certificate from that and import ...
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1 vote
0 answers
108 views

SSH | Permission denied (publickey)

I have two VMs in Google Cloud: I need to establish SSH connection between them. I generate a key in vm by ssh-keygen. saviord7@vm:~/.ssh$ ls -l total 12 -rw------- 1 saviord7 saviord7 1766 Aug 19 15:...
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217 views

Is there a SSHD "Match" Argument for "If user doesn't use pubkey/SSH key auth, do x"?

Is it possible to create a Match argument for when a SSH connection doesn't use a public key for authentication (such as when they use a password instead)? Ideally, I want to run a certain ...
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1 vote
0 answers
485 views

Proftpd: Use public key only to connect

My requirement is such that there must be a custom proftpd docker image which any user can use. The user will run the docker container using the image and on running will mount a mount path to the ...
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0 votes
1 answer
79 views

Unexplained cached public fingerprint for private ssh key with ssh-keygen

I'm having a weird problem with SSH. I'm using ssh-keygen -lf id_rsa to generate the public fingerprint from my private ssh key id_rsa. However, no matter how I replace or change the contents of my ...
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1 vote
1 answer
147 views

OpenSSH RSA publickey mysterious auth failure

I'm not new to configuring OpenSSH to require public key authentication, or generating keys and setting up access via authorized_keys, but this one has me stumped. I made a Linux Mint box for my in-...
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1 answer
412 views

Importing server public key into FileZilla (or other sftp clients)

How to import server public key into FileZilla? I'm able to access my server from SSH, and have the privilege to view whatever that's in /etc/ssh. I can produce hash fingerprints for these public ...
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219 views

share ssh public key on sftp configuration

I've configured a SFTP server on CentOS following this doc. My intention is to forbid the console login for the new users (user1, user2), which belong to the sftpusers group, but still can log in to ...
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0 votes
1 answer
964 views

How to verify a gpg-signed file against a specific public key?

Background information: I have a directory full of files and detached .asc signatures. I also have my default keyring which includes many public keys of people (some of whom I trust and others I don't)...
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1 vote
1 answer
331 views

How could I connect ansible by ssh into 2 Vagrant machines (Virtualbox Hypervisor)?

I would like to connect by ssh one machine with another to do ansible commands. I have a CentOS7 and want to connect inside the OS to Ubuntu16 VM. Look at my Vagrantfile and what I tried: Vagrant....
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2 votes
1 answer
946 views

How to verify an ssh key is valid for a given a host?

I want to test the validity of an ssh passphrase-protected identity file against a given host. I do not want to actually provide the passphrase nor do I necesarily know it, just verify that the ...
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0 votes
1 answer
371 views

DISM RestoreHealth fail because an Invalid public key token

After some trouble with my OS (Windows 8.1 Professional N), i've decide to run the good old SFC /scannow, which found and repair some corrupted file. The CBS log report: 2019-10-05 06:52:37, Info ...
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Public key authentication and change of password

I have set up public key authentication for my Raspberry server. If I change the password of the user authenticated by the public key, shall I recreate the public key? Please advise. Thanks, Dan
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1 vote
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214 views

Openssl DSA Signature Verification Failure Error not understood

I am given a public key in PEM format: -----BEGIN PUBLIC KEY----- MIIDRjCCAjkGByqGSM44BAEwggIsAoIBAQCPPVSofEh+2wGLK/1UOEbx7R5YgCp5 JVrhglBS2QZxdiYnl9JCHVuFQC/vOxFeNmP9GUxv1vcQ7Jjr0J26sdUDFg+dP3ZD ...
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0 votes
1 answer
190 views

SSH connection via intermediate hosts with keys

I read several versions of this question and try to implement them but they did not work so I want to ask my problem with specific details. Host A: Local Computer Host B: Intermediate computer ( I ...
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9 votes
1 answer
10k views

OpenSSH public key file format?

I am having trouble parsing an OpenSSH public key file. I believe (but I am not certain) the format is detailed in RFC 4253, The Secure Shell (SSH) Transport Layer Protocol Section 6.6, Public Key ...
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force scenario about REMOTE HOST IDENTIFICATION HAS CHANGED

everyone know the following message "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r", "@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @\r", "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@...
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3 votes
1 answer
784 views

Differences between ssh-keygen private keys and libressl's?

I generated a private key using libressl 3.0 using curve secp521r1. openssl genpkey -aes128 -algorithm EC -pkeyopt ec_paramgen_curve:secp521r1 -pkeyopt ec_param_enc:named_curve As far as I know this ...
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1 vote
1 answer
5k views

what is the size of public key for ecdsa spec256r1

I tried to generate pair key for ecdsa using openssl. Why the public key length is 65 bytes and not 64? Create private key openssl ecparam -genkey -name secp256r1 -noout -out private.pem Generate ...
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0 answers
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Windows successfully executes ssh but Manjaro does not (publickey)

I have a Raspberry Pi and I can login to it using Windows.  The .ssh/known_hosts file is empty.  However, using Manjaro (a fresh install), I get the following error: pi@raspberrpi: Permission denied (...
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1 vote
0 answers
344 views

importing public key with GNU Privacy Assistant (win 10)

I am trying to import my public key that I generated with Kleopatra and GNU Privacy Assistant. First I generated my public and private keys. I then export my public key and save it to my desktop (...
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1 answer
14k views

How to fix shell request failed on channel 0

a public key authentication is established between 2 machines (windows and linux) when i attempt to connect from the first machine (OS: Centos 7) to the second machine (windows server) , a error ...
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1 vote
0 answers
2k views

OpenSSH resetting connection when I try to SSH

I'm trying to set up my local Windows 7 machine to receive SSH connections so I tried to follow this guide on how to install OpenSSH into a Windows machine to server as an SSH server. I was able to ...
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2 votes
1 answer
2k views

Load key “ec256.pem”: invalid format is thrown on trying to generate public key from private key

I am trying to generate public/private key pair using ECDSA curve secp256k1 On generating public key from ec256.pem (private key) the following error is thrown "Load key "ec256.pem": invalid format" ...
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6 votes
2 answers
8k views

How can I convert a public key generated by PuTTY to RFC 4716 format?

I am using PuTTYgen in order to generate public and private key. My question is, how could I convert this files to RFC4716 format? PuTTYgen allows me to save the public key under a general format, ...
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0 votes
1 answer
2k views

Can't use Debian archive repositories, despite having installed debian-archive-keyring and debian-keyring

I'm trying to use some Debian Archive repositories in my sources.list, for testing purposes. I want to be able to search packages from Debian Sarge. My sources.list looks like that: # Stretch (...
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7 votes
3 answers
20k views

How to check if a GPG encrypted file is encrypted using a specific public key?

Consider if a file is encrypted using command e.g. gpg --output test.txt.gpg --encrypt --recipient test@example.com test.txt Now, consider another person received test.txt.gpg the the pub key test@...
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1 vote
1 answer
69 views

I've generated a public key: 2976 bits ...?

I have generated a public key via ssh-keygen -f foo. The key inside the file foo.pub is AAAAB3NzaC1yc2EAAAADAQABAAABAQDaJ1UGxfjTCzuVNvgjOyK/NF5KFDO2qUREGd9PBB+zJotS85XO9hQjq5XhdekXHfhCM/h3AeGW/xH+...
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0 votes
2 answers
50 views

Issues understanding CA certificates

I have misconceptions regarding CA (Certificate Authority) certificates. No matter how many things I read, it is still not fully clear. Let's take an example, Bob accesses a website. In order for ...
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-2 votes
1 answer
807 views

Cannot connect to server using my public key

I copied my public key to ~/.ssh/authorized_keys on the server. Now I'm trying to establish an ssh connection, but it doesn't work. This is the output from ssh -v (server domain and ip address ...
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19 votes
3 answers
15k views

I got "BEGIN PGP PUBLIC KEY BLOCK" attached to an email and I don't know what it is [duplicate]

Okay, I have no clue what this is, but I just received an email that has this in it. -----BEGIN PGP PUBLIC KEY BLOCK----- [redacted] -----END PGP PUBLIC KEY BLOCK----- If this means something, ...
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3 votes
2 answers
5k views

How to delete public key by fingerprint?

In my pubring.gpg I have two users with the same email address, but one of the entries is not valid anymore. How one can delete one of them?
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