Windows7+SSH

How to solve the problem of UNPROTECTED PRIVATE KEY FILE?

F:\> ssh -i "id_rsa" -p 2251 ??@??.com
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions for 'id_rsa' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
Load key "id_rsa": bad permissions
??@??.com: Permission denied (publickey).

So I went home and tested it with my old computer:

1. An error message appeared: ssh: The term 'ssh' is not recognized as the name of a cmdlet, function, script file, or operable program

2. Checked whether OpenSSH was installed through Get-WindowsCapability -Online | ? Name -like 'OpenSSH*', and found that Windows7 system does not natively support OpenSSH

3. Tried to solve it by installing Git Bash, but Unable to locate the program input point GetSystemTimePreciseAsFileTime on the dynamic link library KERNEL32.dll

4. Tried Release on the OpenSSH official website, and found that it could not be compiled because the api-ms-win-core-file-l1-1-0.dll file was missing in the computer

5. Cygwin official website found that it supports unsupported Windows version, https://cygwin.com/install.html

6. Win+R->cmd->setup-x86_64.exe --allow-unsupported-windows --site http://ctm.crouchingtigerhiddenfruitbat.org/pub/cygwin/circa/64bit/2024/01/30/231215 --no-verify

7. Successfully run Cygwin, set up the Tsinghua University mirror source, https://mirrors.tuna.tsinghua.edu.cn/cygwin/, select openssh, and install various C++ packages

8. It still failed, and then I found that the key file can be used after it is removed from the USB drive. . .