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スピードテストで送受信さ
れる情報を覗いてみよう
2016/09/16
電子の妖精(@biz4g)
とうほぐモバイルミーティング2017
みんな大好きスピードテスト
• スピードテストを行う理由
• 遊びの一環として
• 問題切り分け手段として
• 業務として
• 脳内麻薬でハイになるため
• スピードテストが
• どのサーバと
• どんな内容を
• どれだけ通信しているか
• 知っていますか?
勝手に利用者情報を送信?
• 会場限定
機微情報を他人に覗き見られる?
• JVN#24238648: スマートフォンアプリ「RBB SPEED TEST」
における SSL サーバ証明書の検証不備の脆弱性
• http://jvn.jp/jp/JVN24238648/
これは恥ずかしい
パケットキャプチャのススメ
• Wireshark? いいえ、違います。
• Packet Capture (Grey Shirts) – Google Play
• https://play.google.com/store/apps/details?id=app.greyshirts.sslcap
ture&hl=ja
Packet Capture (Grey Shirts)
• ここが良い
• 無料でフル機能
• Root不要
• 日本語化済み
• UIがわかりやすい
• SSL通信も覗ける
• ここがダメ
• 有料版がない
• 重いデータを開こうとすると落ちる
• あくまで簡易的な解析用
DEMO
上り速度が理論値を超える現象
• UQ mobileがau本家級の速度、mineoとIIJmioは昼時が鬼門
――「格安SIM」の実効速度を比較(au&Y!mobile回線4月
編) - ITmedia Mobile
• http://www.itmedia.co.jp/mobile/articles/1705/22/news046.html
• 『上りの速度は下りを上回っており、トップはUQ mobileで99.18Mbps。
LTE NETも93.79Mbpsとアップロードは相当速い。IIJmio(タイプA)も上
りは26.9Mbps出ている。ただしauの上り理論値(25Mbps)を超えてい
るため、参考程度に見ておいた方がいい』
JR横浜駅西口での測定結果(午前)
JR横浜駅西口での測定結果(昼)
その正体は……UDC
•Uplink Data
Compression
(上りデータ圧縮)
地域格差
UDCが有効になる条件
• UQ WiMAX 2+ または AXGP
• 東名阪エリア(特定メーカーの機種)
• HUAWEI→OK!
• ERRICSON→NG!
• ZTE→NG!
• UDC対応機種であること
• Qualcomm X12 LTE Moderm採用モデル?
• 時間帯?
• SSL通信でないこと
UDCの様々な実装
• 3G世代のIPDC
• 3GPP TR 25.700
• 実際は利用されず…?
• QualcommのUpload+
• Qualcommのプロプライエタリ技術
• UQ/WCP/チャイナモバイルに採用
• 4.5G世代のUDC
• 3GPP TR 36.754
• https://portal.3gpp.org/desktopmodules/Specifications/Specification
Details.aspx?specificationId=3167
• 第816回:UDCとは - ケータイ Watch
• http://k-tai.watch.impress.co.jp/docs/column/keyword/1072258.html
何が起こるか
• 「総務省実効速度調査」測定方法/測定結果 | その他のネッ
トワークサービス | 通信・エリア | モバイル | ソフトバンク
• https://www.softbank.jp/mobile/network/explanation/speed-survey/
スピードテストの値が信用できない
• 総務省|「インターネットのサービス品質計測等の在り方に関
する研究会」報告書等の公表及び意見募集の結果
• http://www.soumu.go.jp/menu_news/s-
news/01kiban04_02000095.html
• 「理論値だけはダメ」「実効速度を公表しなさい」
• UDCの実効値は実効値か?
• スピードテストがSSL対応か否か?
• 総務省仕事して💛

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スピードテストで送受信される情報を覗いてみよう