On Wed, 01 Jun 2016 13:58:20 +0800, you said: > Sorry, I mean the mail's content > I can not read the mail, there's only a *.bin file attached You have a defective mail reader, which is unable to recognize a digital signature. There's been an Internet standard for that since 1995, so there's *really* no excuse. 1847 Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted. J. Galvin, S. Murphy, S. Crocker, N. Freed. October 1995. (Format: TXT=23679 bytes) (Status: PROPOSED STANDARD) (DOI: 10.17487/RFC1847) Even if your mail reader doesn't understand how to verify a PGP digital signature, it should at *least* tell you "This was a text mail with a digital signature I can't handle". It's 2016. Even Outlook figured out how to do this a decade ago. Complain to whoever did your mail software. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies