小编给大家分享一下Linux中如何使用ssh-keygen命令，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
Linux常用命令ssh-keygen命令用于为“ssh”生成、管理和转换认证密钥，它支持RSA和DSA两种认证密钥。
命令格式
语法 ssh-keygen [-q] [-b bits] -t type [-N new_passphrase] [-C comment] [-f output_keyfile] ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile] ssh-keygen -i [-f input_keyfile] ssh-keygen -e [-f input_keyfile] ssh-keygen -y [-f input_keyfile] ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile] ssh-keygen -l [-f input_keyfile] ssh-keygen -B [-f input_keyfile] ssh-keygen -D reader ssh-keygen -F hostname [-f known_hosts_file] ssh-keygen -H [-f known_hosts_file] ssh-keygen -R hostname [-f known_hosts_file] ssh-keygen -U reader [-f input_keyfile] ssh-keygen -r hostname [-f input_keyfile] [-g] ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point] ssh-keygen -T output_file -f input_file [-v] [-a num_trials] [-W generator]常用选项
-b：指定密钥长度；-e：读取openssh的私钥或者公钥文件；-C：添加注释；-f：指定用来保存密钥的文件名；-i：读取未加密的ssh-v2兼容的私钥/公钥文件，然后在标准输出设备上显示openssh兼容的私钥/公钥；-l：显示公钥文件的指纹数据；-N：提供一个新密语；-P：提供（旧）密语；-q：静默模式；-t：指定要创建的密钥类型。参考示例
创建一个默认密钥
[root@localhost ~]# ssh-keygenGenerating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa):Enter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is:SHA256:QfclO+AvXZ/O6vGNfzo4P2pftiHRoKG2fgc5p9bvu1o root@localhost.localdomainThe key's randomart image is:+---[RSA 2048]----+| . o . . || . o o + || . ..+.. || ..oooo..|| So..+. o.|| . .= .+ || . *+ Eo|| . ++oO+=|| .o.+OO%*|+----[SHA256]-----+[root@localhost ~]#指定要创建的密钥类型
[root@localhost ~]# ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa):/root/.ssh/id_rsa already exists.Overwrite (y/n)? yEnter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is:SHA256:nTaoqOxlG6IQQ2zDTMvSk2EON+4tLrYqPy7IBrstoy4 root@localhost.localdomainThe key's randomart image is:+---[RSA 2048]----+|..= ||*B.+ ||.X* ||+..o o . ||o o . S = ||.+ . . . . . ||*oo = . ||EBo= o ||%@B.. |+----[SHA256]-----+[root@localhost ~]#使用-t参数创建一个指定密钥的类型并添加注释
[root@localhost ~]# ssh-keygen -t rsa -C "deng@qq.com"Generating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa):/root/.ssh/id_rsa already exists.Overwrite (y/n)? yEnter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is:SHA256:Wx3MWwj36fwhcnb6hjdIIJ3SUggCLcmFq62Earqy2E0 deng@qq.comThe key's randomart image is:+---[RSA 2048]----+| ..*o .. o . || = .. . * o . || o + * + || . + * * ||. o S =.++oo ||.o . o +.+..||o . E . ..o .||++ o o.+ ||Oo. . o..|+----[SHA256]-----+[root@localhost ~]#读取openssh的私钥或者公钥文件
[root@localhost ~]# ssh-keygen -eEnter file in which the key is (/root/.ssh/id_rsa):---- BEGIN SSH2 PUBLIC KEY ----Comment: "2048-bit RSA, converted by root@localhost.localdomain from O"AAAAB3NzaC1yc2EAAAADAQABAAABAQCyQ/iZYPZHH7+4Gcfq259xChnidsf25piKsnRi+o/XZcD0s9QL8oX24OuX5pPQcmfD6Rw6sQCrTy66LrSw2NmPpKc0XdUbXEkLYBN4d3SY+ZLT3Ot8L6jaDmwgXsBu8lTXzAEWLm+16RXAZAB/27ohi48PfcIDYyeJ1JDpieCJ1/a/KrR9V4erWVBt/ZE8KoC0MTQlUn7H3oABVS9O6sdY4dYc/T9l33EbqZMc2feYZnuWtrPdrYfz37C+kzg3ZrDojGXtiWk1p/PG5KoAH6GzuYYIuMtrUTnadRv4wZo29RF+n5Ty8HEeYqSceHWWvwJjqnpqj9cgeNQvq6E3PJbD---- END SSH2 PUBLIC KEY ----[root@localhost ~]#安静模式生成密钥对
[root@localhost ~]# ssh-keygen -q -t rsaEnter file in which to save the key (/root/.ssh/id_rsa):/root/.ssh/id_rsa already exists.Overwrite (y/n)? yEnter passphrase (empty for no passphrase):Enter same passphrase again:[root@localhost ~]#以上是“Linux中如何使用ssh-keygen命令”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注编程网行业资讯频道！
