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.

We can generate these private public keys by various ways.

Cert Public Key

Aug 18, 2015  This P7B can be used as the 'public key' in AccessData products. AD Enterprise, the AccessData Agent, and Site Server all require a public and private key pair to function. If you use IIS to generate or otherwise house your certificates, you may need to extract your private/public key pair to use with AccessData products. Export the root certificate public key (.cer) After creating a self-signed root certificate, export the root certificate public key.cer file (not the private key). You will later upload this file to Azure. The following steps help you export the.cer file for your self-signed root certificate.

1) By using openssl.

Create A Public Key Certificate

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.

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. Transport fever patch mac download.

Generating Self sign certificate:

Public Keys, Private Keys, and Certificates

When performing authentication, SSL uses a technique called public-key cryptography.

Public-key cryptography is based on the concept of a key pair,which consists of a public key and a privatekey. Data that has been encrypted with a public key canbe decrypted only with the corresponding private key. Conversely,data that has been encrypted with a private key can be decrypted onlywith the corresponding public key.

The owner of the key pair makes the public key available toanyone, but keeps the private key secret.

A certificate verifies that anentity is the owner of a particular public key. Django extensions generate secret key.

Certificatesthat follow the X.509 standard contain a data section and a signaturesection. The data section includes such information as:

• The Distinguished Name of the entity that owns thepublic key

• The Distinguished Name of the entity that issued thecertificate

• The period of time during which the certificate isvalid

• The public key itself

Create Private Key From Certificate

You can obtain a certificate from a Certificate Authority(CA) such as VeriSign. Alternately, you can createa self-signed certificate, in which the ownerand the issuer are the same.

Generate Public Key From Certificate Keytool

An organization that issues certificates can establish a hierarchyof CAs. The root CA has a self-signed certificate. Each subordinateCA has a certificate that is signed by the next highest CA in thehierarchy. A certificate chain isthe certificate of a particular CA, plus the certificates of any higherCAs up through the root CA.