數位簽章-文字檔

1. 對 demo.txt 進行明文數位簽章。

   [deyu1@kvm8 ~]$ gpg --clearsign demo.txt
   
   You need a passphrase to unlock the secret key for
   user: "abc123 (ABC) <abc123@csie.cyut.edu.tw>"
   2048-bit RSA key, ID A98B198E, created 2014-05-26
   

2. 簽章後檔案預設為檔名.asc，也就是 demo.txt.asc，檔案以 ASCII 碼存檔。

   [deyu1@kvm8 ~]$ cat demo.txt.asc 
   -----BEGIN PGP SIGNED MESSAGE-----
   Hash: SHA1
   
   abc123
   -----BEGIN PGP SIGNATURE-----
   Version: GnuPG v2.0.14 (GNU/Linux)
   
   iQEcBAEBAgAGBQJTgsY1AAoJEGKwGRGpixmOF9MIAKCgWrK7sgqJqUsMOutKIOQT
   aQXER43zTXQPUHQgB88q8UX2HdObfNUgG70oSpqLhNEloTYEF66sTVQ6143NDCR1
   NwjdK3WNH9KhBHhy+TyYKx7vOWhyugBI/ePEPzkrbqrMiMOiAB+S4bWsFCGVPTOb
   iiyeUq71AdXLveXmfS5qQzR3jGaQy+K9WDEnVVDhMoz2Sv9BbNBkVahs4gMSO9+y
   aBu4L4h4bBcjesQV42IebUjNwDkl76VxkL8m0XXlip8u9pwELjsl+dfCxS//9qK0
   oc0duZIGnqboZqI75v9gHqhRsmxUlnWs9H67m1X7inb9iy7xqtPEHGBat0tRaB8=
   =Y+e7
   -----END PGP SIGNATURE-----
   

3. 驗證簽章。

   [deyu1@kvm8 ~]$ gpg --verify demo.txt.asc
   gpg: Signature made Mon 26 May 2014 12:42:29 PM CST using RSA key ID A98B198E
   gpg: Good signature from "abc123 (ABC) <abc123@csie.cyut.edu.tw>"
   

4. 對 demo.txt 進行數位簽章。

   [deyu1@kvm8 ~]$ gpg --sign demo.txt
   
   You need a passphrase to unlock the secret key for
   user: "abc123 (ABC) <abc123@csie.cyut.edu.tw>"
   2048-bit RSA key, ID A98B198E, created 2014-05-26
   

5. 簽章檔預設檔名加上 gpg 附檔名，也就是 demo.txt.gpg，檔案不以 ASCII 存檔。

   [deyu1@kvm8 ~]$ cat demo.txt.gpg
   .............................
   

6. 驗證簽章。

   [deyu1@kvm8 ~]$ gpg --verify demo.txt.gpg 
   gpg: Signature made Mon 26 May 2014 12:51:59 PM CST using RSA key ID A98B198E
   gpg: Good signature from "abc123 (ABC) <abc123@csie.cyut.edu.tw>"