Putty ssh with private key
SSH agent forwarding allows you to forward the SSH key remotely. In such a scenario, SSH agent forwarding should be used. This leaves a security risk of the private key being exposed/accessed by other users of jump/bastion host.
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So that it can be used for authentication when connecting to servers. If you are using some jump server or bastion host for connecting servers then you need to store your private key on that server (jump/bastion). So every time you connect to the server you need to supply your private key for authentication. In this age of cloud, all the Linux servers deployed in the cloud come with default key-based authentication Authentication is done using pair of keys: Private key (with user) and Public key (stored on server). Traditionally we used to have password-based authentication for Linux servers.
![putty ssh with private key putty ssh with private key](https://res.cloudinary.com/lwgatsby/f_auto/www/uploads/2021/10/image20-min.png)
Putty ssh with private key how to#
Then we will dive into how to configure it in putty. The passphrases are relatively easy to break compared to the private key itself so this should not be relied on for primary security (you should keep your private key in safe places only).Let’s start with some basics about SSH key/agent forwarding. The public key isn't affected at all by this. When you assign a passphrase to a key, it just does a simple encryption on the private key stored on your computer. So in essence, no it's realistically not possible. Currently there is no known way to do this quickly I'm not sure if hackers have even bothered with writing tools to try. You can factor n to figure out p and q the problem is that n is a freaking huge number with tons of possible p and q numbers. Originally there were two huge prime numbers p and q which were used to calculate n, d, and e so that n and e could encrypt a text n and d could decrypt the cyphertext. The private key has the same n, and another number d.
![putty ssh with private key putty ssh with private key](https://dmhnzl5mp9mj6.cloudfront.net/security_awsblog/images/SSH4.b.jpg)
The system was specifically designed this way so that you could issue your public key to anyone without worrying about them being able to figure out your private key.Īssuming you had RSA keys (the most common), the public key has two number in it: n and e. Presently the only way of "recovering" the Private key from the Public key is by exhaustive search (brute force). Is there any way to recover the private key, if i can't recover the actual file that contained it? Perhaps by importing the public key into PuTTYgen or openssl and doing some reverse thing on it? Contacting all the admins involved and sending them new keys could be a pain, so that's pretty much a last resort.
![putty ssh with private key putty ssh with private key](https://www.amaze.com.au/wp-content/uploads/2019/01/Public-and-Private-Keys.png)
But the prospects aren't looking good so far.) Either way, it sounds like it might not be possible to recover the key file itself. I might(!) still have an old backup of the registry from before the machine died as well, but would have to search for it. What i have left is an OpenSSL-compatible base64 of the public key (from one of the machines still set up to accept passwords), and of course the passphrase to the key. The private key file is encrypted by the file system, and now that it's basically on what looks like a whole other OS and user, whatever XP would do to decrypt the key apparently can't be done anymore.) (The computer it was on crashed, to the point that a reinstall of XP was required. I have an RSA key (generated by PuTTYgen) that's set up for logging in to a bunch of machines via SSH.