Cryptography/zh-cn

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加密技术 为您的谈话和文件保障了安全和隐私。Fedora 内置了两个有关工具: OpenSSHGnuPG LUKS 也被整合进入了Fedora以便提供硬盘加密功能。

Contents

原理

OpenSSH and GnuPG use a common cryptographic theory to allow encryption and cryptographic signatures based upon public and private keys. In this theory, each person or organization has one or more private keys, and each private key has a corresponding public key. The private key is required to decrypt data and create signatures. The public key can be shared freely and is used to encrypt data and verify signatures. More information about how and why this works can be found on the OpenSSH and GnuPG websites.

OpenSSH

OpenSSH is an SSH implementation included in Fedora. SSH (Secure SHell) allows encrypted and cryptographically authenticated connections between computers.

安装 OpenSSH

OpenSSH is usually included by default on Fedora installations. If you do not already have it installed, you can install the package using yum:

yum install openssh

生成 SSH 密钥

Once SSH is installed, you can use ssh-keygen to create your private and public keys:

ssh-keygen -t rsa

You will be prompted for a location (pressing Enter uses the default. You may wish to name this something specific if you are using this key to access some specific set of machines), and a passphrase. Choose a good passphrase that you won't forget.

Warning (medium size).png
You must remember this passphrase!
If you forget it, you will not be able to recover it, and you will not be able to access anything using your key. You would then have to create a new key and share the new public key with anyone who had your old one.

For usage instructions for ssh-keygen, run man ssh-keygen to view the manual.

By default, your new private and public keys will be stored in ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub, respectively.

You can share your public key openly. Server administrators can use it to grant you access to their systems. You should carefully protect your private key and not share it with anyone.

You can use your ~/.ssh/config file to determine which key is used for which hosts:

HOST *.fedoraproject.org fedorapeople.org *.fedorahosted.org
     IdentityFile ~/.ssh/id_rsa_fedora

see 'man ssh_config' for more information.

Additional information is available at:

GnuPG

The GNU Privacy Guard (GnuPG or GPG) is a generic cryptographic tool. GPG is often used to sign email messages, and the Fedora Project uses it to sign packages.

安装 GnuPG

GnuPG is included in Fedora. It can be installed using yum:

yum install gnupg

生成 GPG 密钥

GPG key creation is more complex than SSH key creation, and many people prefer to use a graphical interface such as kgpg on KDE or seahorse on GNOME. kgpg is available in the kdeutils package. seahorse is in the Fedora repository.

See Creating GPG Keys from the Fedora Documentation Project for detailed command line instructions.

Additional information is available at: