Cryptographic - Private Key

Public Key Crypto Pair Key Creation

About

This article talks about the secret known as the private key in a asymmetric cryptographic scheme.

A private key is a cryptographic key that is private (that you should be kept secret).

This page is about how to manage/create a What is a Public Key Cryptography (known as Asymmetric Cipher) ? private key.

An What is a Public Key Cryptography (known as Asymmetric Cipher) ? private key is categorized as something you have authentication.

Management

Algorithm Scheme

There is two asymmetric cryptographic scheme that defines how to create a private key.

There is therefore two types of key. The most known being RSA

File Format

Different file formats are used to store keys.

Create

The creation of the private key is format dependent.

Pem

See Management of a RSA Private Key in PEM format (OpenSSH)

Ppk

For a ppk private key (Putty), see ppk create

Decrypt / Suppress passphrase

With a: 

-----BEGIN OPENSSH PRIVATE KEY-----
xxxxxxxxxx
-----END OPENSSH PRIVATE KEY-----

# with prompt of the passphrase
# where N is the new passphrase (ie empty)
# and f is the file
ssh-keygen -p  -N "" -f /path/keyfile.pem

Support

WARNING: UNPROTECTED PRIVATE KEY FILE!

chmod  400 /path/keyfile.pem




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