≡ Menu

ssh-keygen command

How To Setup SSH Keys on a Linux / Unix System

I recently read that SSH keys provide a secure way of logging into a Linux and Unix-based server. How do I set up SSH keys on a Linux or Unix based systems? In SSH for Linux/Unix, how do I set up public key authentication?
[click to continue…]

Debian / Ubuntu: Install Duplicity For Encrypted Backup In Cloud

My cloud based backup service provider has ssh access to the backup system. How do I install and configure duplicity software for remote backups in incremental and encrypted format on Debian or Ubuntu Linux based desktop / laptop / server?
[click to continue…]

Rackspace Cloud Files: Upload Files Using Secure FTP (SFTP) Client [ sftp-cloudfs ]


I‘m using cloud files from Rackspace to store files in cloud. I know how to use ftp client with cloud files, but I would like to use Secure File Transfer Program, sftp on the command line, a true SSH File Transfer Protocol client from the OpenSSH project for security and privacy concern. How do I install sftp-cloudfs under Linux or Unix like operating systems?
[click to continue…]

Linux / Unix ssh-keygen: Create A Host Key File

How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
[click to continue…]

Install / Append SSH Key In A Remote Linux / UNIX Servers Authorized_keys

How do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?
[click to continue…]

Linux Generate RSA SSH Keys

How do I generate ssh RSA keys under Linux operating systems?
[click to continue…]

Linux / UNIX: Generate SSH Keys

How do I generate ssh keys under Linux / UNIX / Mac OS X and *BSD operating systems for remote login?
[click to continue…]

Debian / Ubuntu Linux Public key Blacklisted (see ssh-vulnkey(1)) Error and Solution

Q. When ever I try to login to my remote Debian Linux server called in013.example.com, I get the following error message in /var/log/auth.log file:

Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))
Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))

I’m using Ubuntu Linux as desktop operating system. How do I fix this error?
[click to continue…]

OpenSSH Change a Passphrase With ssh-keygen command

How do I change OpenSSH passphrase for one of my private keys under Linux, OpenBSD, FreeBSD, Apple OS X or Unix like operating systems?
[click to continue…]

Warning: Remote Host Identification Has Changed error and solution

When I run ssh command I get an error which read as follows:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c.
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
RSA host key for ras.mydomain.com has changed and you have requested strict checking.
Host key verification failed.

How do I get rid of this message?
[click to continue…]