February 2015
Intermediate to advanced
200 pages
4h 48m
Japanese
Content preview from Bluetooth Low Energyをはじめよう
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Bluetooth Low Energyをはじめよう
ペアリングのアルゴリズム
ペ ア リ ン グ 手 順 に は 、 セ キ ュ リ テ ィ・ マ ネ ー ジ ャ・ プ ロ ト コ ル（ SMP）パ ケ ット を や り 取 り し て
短期鍵（STK）と呼ばれる一時的な暗号鍵を両側で生成することが必要となる。ペ アリン
グ手順の最後のステップ（セキュリティ暗号鍵のやり取りを続けてボ ン デ ィン グ 手順に進
むかどうかにかかわらず）は、生 成された STKを使ってリンクを暗 号 化することだ。パケット
のやり取りによって、両側のピアは以下の STK 生成手法のネゴシエーションを行う。
• Just Works
STK は、平文でやり取りされるパケットに基づいて両側で生成される。中間者（MITM）
攻撃に 対 す るセ キュリティは 提 供され な い 。
• パスキー表 示（Passkey Display）
ランダムに生 成された数 字 6 個のパスキーが一方のピアに表示され、反対側ではそれを
入力するよう要求される（ディスプレイが利用できない場合など、場合によっては両方の
側で同じキーを入 力することになる）。MITM 攻撃に対する保護が提供されるので、可
能な場合には常にこの方式が利用される。
• ア ウト オ ブ バ ンド（OOB）
この手法を使用する際には、NFC のような別の無線技術など、BLE 無線とは別の手段で
追加的なデータが転送される。この手法でもMITM攻撃に対する保護が提供 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.