Alfi’S Expressions

Happy to share my feelings

Keamanan Email

    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
     O2KObRY4ezS1yNgah4YU2M1Dj1ng3cb.nmszdM9C8vG4PTaTynr_GGOPHMyc
     WutK8bJoPXpwWWoSddteycNjyZOwi8zneJZPcxMKOS5yCIRihvBnVee7v6xy
     byCzN63_1Mi5vhZ.NpuCvwgSNvSksakbKph7o1HiZZPEdDxX7G4BGzmfY0KC
     V677zC5UuoyVbq2Vn8W2.uAsHcUorxAJOSTcQnvmbdKhFPGpvO6tMzgTc31T
     qvbJoOFIV2KpqTrwrOrIo67c_8db7w5_Annw7mCYSFRFkXJslBPLgsxzO1N5
     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.
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    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.

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