Generate A Public Key Openssl

Generate A Public Key Openssl Average ratng: 8,7/10 3033 reviews

One of the most common forms of cryptography today is public-key cryptography helps to communicate two system by encrypting information using the public key and information can be decrypted using private key. These keys are using mainly on login to server securely and also transferring data securely.

Nov 06, 2019 It's also possible to generate keys using openssl only: openssl genrsa -out private.pem 2048 openssl rsa -in private.pem -pubout -out public.pem This comment has been minimized. While Encrypting a File with a Password from the Command Line using OpenSSL is very useful in its own right, the real power of the OpenSSL library is its ability to support the use of public key cryptograph for encrypting or validating data in an unattended manner (where the password is not required to encrypt) is done with public keys.

We can generate these private public keys by various ways. Microsoft office 2013 standard key generator.

1) By using openssl.

with password encryption

Generate public key:

2) By using ssh keygen

3) using putty-gen for windows.

Download puttyGen from http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html and run it.

You can select one of the key types, SSH-1, SSH-2, and SSH-2 DSA.
SSH-2 is probably better than others but you have to make sure if your system supports SSH-2, if your system ( server) doesnt support it then you better off with SSH-1.

Level of encryption can be set from “Number of bits in a generated key” . Security level can be enhance by using 2048 but again make sure where you are using it and thus follow the recommendation for this value. I prefer 2048 but even with 1024 is much more secure.

Click on generate to create keys. Move your mouse over the empty space to help puttygen to genereate random variables.

Once the key is generated you will see following window.

If you want to login without password ( in case of ssh login) you can put your passphase empty. click on Save Public key and Save private key to save your keys.

Extract Private Key Openssl

When you save private key it will be saved in ppk format which you can use putty to login to your system.

We can get private key for openSSH by clicking on Conversions->Export OpenSSH key

If you want to use ssh to login with these generated key / pair then
copy public key ( mykey.pub) to .ssh/authorized_key.

Generating Self sign certificate:

To perform the following actions for Windows or Linux, you must have OpenSSL installed on your system. Cisco ios generate ssh key.

Generating the Private Key -- Windows

In Windows:

1. Open the Command Prompt (Start > Programs > Accessories > Command Prompt).

2. Navigate to the following folder:

C:Program FilesListManagertclwebbincerts

3. Type the following:

openssl genrsa -out rsa.private 1024

4. Press ENTER. The private key is generated and saved in a file named 'rsa.private' located in the same folder.

NOTE The number '1024' in the above command indicates the size of the private key. You can choose one of five sizes: 512, 758, 1024, 1536 or 2048 (these numbers represent bits). The larger sizes offer greater security, but this is offset by a penalty in CPU performance. We recommend the best practice size of 1024.

Generating the Public Key -- Windows

1. At the command prompt, type the following:

openssl rsa -in rsa.private -out rsa.public -pubout -outform PEM

2. Press ENTER. The public key is saved in a file named rsa.public located in the same folder.

Generating the Private Key -- Linux

1. Open the Terminal.

2. Navigate to the folder with the ListManager directory.