Alfi'S Expressions

Tugas mata kuliah Keamanan Informasi selanjutnya adalah mengenai keamanan email. Tugas pertama adalah mengirimkan dua (2) attachment kepada diri sendiri, kemudian melihat “raw file” dari berkas email tersebut. Kemudian menunjukkan bagaimana attachment diproses dalam email.

Saya menggunakan email client thunderbird dari mozilla. Email yang masuk dilihat kode sumber halamannya.

Hasil yang didapat adalah sebagai berikut.

Delivered-To: alfibisnis@gmail.com
Received: by 10.223.120.15 with SMTP id b15cs34829far;
        Sun, 10 Apr 2011 03:31:42 -0700 (PDT)
Received: by 10.231.8.67 with SMTP id g3mr4177085ibg.115.1302431500442;
        Sun, 10 Apr 2011 03:31:40 -0700 (PDT)
Return-Path:
Received: from nm3-vm0.bullet.mail.sg1.yahoo.com (nm3-vm0.bullet.mail.sg1.yahoo.com [115.178.12.242])
        by mx.google.com with SMTP id s1si13437842iba.13.2011.04.10.03.31.38;
        Sun, 10 Apr 2011 03:31:40 -0700 (PDT)
Received-SPF: pass (google.com: best guess record for domain of alfibisnis@yahoo.com designates 115.178.12.242 as permitted sender) client-ip=115.178.12.242;
Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of alfibisnis@yahoo.com designates 115.178.12.242 as permitted sender) smtp.mail=alfibisnis@yahoo.com; dkim=pass (test mode) header.i=@yahoo.com
Received: from [115.178.12.220] by nm3.bullet.mail.sg1.yahoo.com with NNFMP; 10 Apr 2011 10:31:38 -0000
Received: from [115.178.12.229] by tm1.bullet.mail.sg1.yahoo.com with NNFMP; 10 Apr 2011 10:31:38 -0000
Received: from [127.0.0.1] by omp1006.mail.sg1.yahoo.com with NNFMP; 10 Apr 2011 10:31:38 -0000
X-Yahoo-Newman-Property: ymail-3
X-Yahoo-Newman-Id: 122162.116.bm@omp1006.mail.sg1.yahoo.com
Received: (qmail 13846 invoked by uid 60001); 10 Apr 2011 10:31:38 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1302431498; bh=fH2tUi0N0ugbx2BHzu5tHib1HSIMuITC8zNLQJY5Qg4=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=ctHbsgxgPD+LPOuCH/Vhs7LC57M0+xRb5X+ixoRlf0wJWI0+CTvusYEQM6aD3mw6P61TjyqM34oUlCSfGan9ozAfRRHCsqUqUoA90yXT/GYuSNA2yET+aKOT19hItrELwoTWrrySED+OpYR3ogZZKyRjUN7iRH5aSYbNZKYZ8A8=
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=yahoo.com;
  h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type;
  b=OfynqPQWImJaRckv/F20Ta7ul+B+VA8RLTaUGrlpmSD+Ns6iIfeSss83bl1M9Atub+y26yc0zgtX6o6LTPWR2CcD/QfE/++sg5bWDw4z0QHbcP4TezwxQNE/IrtAWXNgOqwtXC8u5DEvpaBzJ1v/uanChvgrFE+wVk8Ip5Defv0=;
Message-ID: <8929.13658.qm@web78206.mail.sg1.yahoo.com>
X-YMail-OSG: BTofHbIVM1kmO1hFuK.NEIipPhhQosbdMGPKy.yvyiOeWOz
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 rLRCfWu53Fr5UPzTyDVupas0.bhtnc0Echp7_qrS0ltIlkKU-
Received: from [114.79.3.183] by web78206.mail.sg1.yahoo.com via HTTP; Sun, 10 Apr 2011 18:31:37 SGT
X-Mailer: YahooMailClassic/12.0.2 YahooMailWebService/0.8.109.295617
Date: Sun, 10 Apr 2011 18:31:37 +0800 (SGT)
From: Alfi Satria
Subject: Kamsis tugas keamanan email
To: alfibisnis@gmail.com
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="0-489932914-1302431497=:13658"

--0-489932914-1302431497=:13658
Content-Type: multipart/alternative; boundary="0-649080733-1302431497=:13658"

--0-649080733-1302431497=:13658
Content-Type: text/plain; charset=us-ascii

ini contoh pengiriman 2 attachment, satu txt, satu lagi gif.
--0-649080733-1302431497=:13658
Content-Type: text/html; charset=us-ascii



ini contoh pengiriman 2 attachment, satu txt, satu lagi jpg.


--0-649080733-1302431497=:13658--
--0-489932914-1302431497=:13658
Content-Type: text/plain; name="tes-email.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="tes-email.txt"

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--0-489932914-1302431497=:13658
Content-Type: image/jpeg; name="wmpnss_color32.jpg"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="wmpnss_color32.jpg"

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--0-489932914-1302431497=:13658--

Dua attachment yang dikirim dibatasi oleh kode: –0-489932914-1302431497=:13658-, yang merupakan boundary yang diperoleh dari informasi header. Attachment dikodekan dengan metode base64, sehingga plain text atau gambar yang kita sertakan akan membentuk karakter lain seperti yang kita lihat di atas.

Selanjutnya, tugas kedua adalah menyadap email. Untuk menyadap email ini saya menggunakan program Wireshark. Sementara program Wireshark bekerja, saya mengirimkan email dari Thunderbird ke alamat email saya yang lain. Hasil tangkapan Wireshark adalah sebagai berikut (khusus untuk protocol SMTP saja).

Terlihat bahwa ada komunikasi antara komputer saya dengan mx.googlemail.com, tapi karena saya menggunakan pilihan enkripsi, maka pesan-pesan yang saya kirimkan dienskripsi sehingga tidak bisa terbaca dengan jelas pada hasil tangkapan Wireshark.