ガーディアン紙ワシントンポスト紙が、国家安全保障局 (National Security Agency) の極秘監視プログムの存在を今週明らかにしたのを受け、アメリカでは自分の電話やパソコンのデータについて警戒する人が増えている。

しかし、個人的な会話がまるでできなくなるというわけではない。最近の検閲問題で、デジタル情報のプライバシーを守るための指針がウェブ上 (マイクロソフトのSlateワシントンポストExtremeTechなど) で盛んに採り上げられている。トーア (Tor) も、インターネット通信経路の秘匿化を守るため、検閲対策のアプリケーションをダウンロード可能にする体制をとっている。

以下に、最強のデジタルスパイさえも撃退し、お持ちのモバイルデバイスを死守できる7つのアプリケーションが紹介している。

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  • Silent Circle

    <a href="https://silentcircle.com/web/how-it-works/" target="_blank">Silent Circle's "Silent Suite"</a> for iPhone and Android encrypts phone calls, files, texts, emails and video recordings, and can be set to erase them all from a sender's device within minutes of sending. When the app hit the market in October of last year, Slate said the product "<a href="http://www.slate.com/articles/technology/future_tense/2012/10/silent_circle_mike_janke_s_iphone_app_makes_encryption_easy_governments.single.html" target="_blank">has governments nervous</a>."

  • Redphone & TextSecure

    If Silent Circle's $120 annual subscription fee is too much, but you still want the option of encrypting your calls and texts, try <a href="https://whispersystems.org/" target="_blank">Open WhisperSystems' free security apps</a> for iPhone and Android. Redphone allows users to encrypt their phone calls, while TextSecure allows them to do the same for texts.

  • Orbot & Onion Browser

    The Android app <a href="https://play.google.com/store/apps/details?id=org.torproject.android&feature=search_result#?t=W251bGwsMSwxLDEsIm9yZy50b3Jwcm9qZWN0LmFuZHJvaWQiXQ" target="_blank">Orbot</a> lets you browse the web anonymously on your phone and would seemingly prevent <a href="http://www.huffingtonpost.com/2012/07/09/app-privacy-ads_n_1658191.html" target="_blank">advertising networks or others from getting information</a> about you based on your mobile web browsings. The <a href="https://itunes.apple.com/us/app/onion-browser/id519296448?mt=8" target="_blank">Onion Browser</a> works similarly, but for the iPhone.

  • Cloudfogger & NoteCipher

    If you're afraid of storing information in the Cloud, you can try <a href="https://play.google.com/store/apps/details?id=com.cloudfogger.cf&hl=en" target="_blank">Cloudfogger</a>, an open-source Android and iPhone app that encrypts anything you store in the Cloud. If you have an Android phone, you can also pair that with <a href="https://play.google.com/store/apps/details?id=info.guardianproject.notepadbot" target="_blank">the Guardian Project's NoteCipher</a>, which encrypts notes on your phone's hard drive.

  • DuckDuckGo

    <a href="https://play.google.com/store/apps/details?id=com.duckduckgo.mobile.android&hl=en" target="_blank">A search engine called DuckDuckGo</a>, available for the Android and the iPhone, has built its reputation around privacy. It doesn't track or store searches, and people who use it are effectively anonymous.

  • Gemini App Manager

    Smartphone users can generally uninstall (or avoid altogether) apps that they believe compromise their privacy -- unless those apps are "<a href="http://whatisbloatware.com/" target="_blank">bloatware</a>," apps pre-installed by the phone's carrier and impossible to remove by normal means. The <a href="https://play.google.com/store/apps/details?id=com.seasmind.android.gmappmgr&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5zZWFzbWluZC5hbmRyb2lkLmdtYXBwbWdyIl0" target="_blank">Gemini App Manager</a> for Android allows <a href="http://www.howtogeek.com/115533/how-to-disable-or-uninstall-android-bloatware/" target="_blank">users to get around the phone's restrictions and disable the bloatware</a>, thus removing potentially privacy-invading apps.

  • InTheClear

    The <a href="https://play.google.com/store/apps/details?id=org.safermobile.intheclear" target="_blank">InTheClear</a> app allows you to delete all your personal data on your Android phone in an instant by pressing the app's red "Panic!" button. You can also use the app to send an emergency text message when the Panic! button is pressed, so that your compatriots know that you've wiped your cell and might be in serious trouble.