文件：

echo 'This is a sekret' >/tmp/msg.txt

导出公钥（以防您丢失/丢失公钥）：

Export public key (in case you don't have it/lose it):

openssl rsa -in ~/private.pem -out /tmp/public.pub -outform PEM -pubout

使用公钥加密文件（任何人都可以拥有此密钥）：

Encrypt file with public key (anyone can have this key):

openssl rsautl -encrypt -inkey /tmp/public.pub -pubin -in /tmp/msg.txt -out /tmp/file.enc

用私钥解密文件（只有您应该拥有私钥）：

Decrypt the file with private key (only you should have the private key):

openssl rsautl -decrypt -inkey ~/private.pem -in /tmp/file.enc -out /tmp/decrypted.txt

Th解码后的邮件：

cat /tmp/decrypted.txt