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Android Privacy Guard (APG) is a Free Software and open source application that runs on the Android Operating System. The application provides strong, user-based encryption which is compatible with the Pretty Good Privacy (PGP) and GNU Privacy Guard (GPG) programs. This allows users to encrypt, decrypt, sign, and verify signatures for text, emails, and files. The program allows you to store the credentials of other users with whom you interact, and to encrypt a file such that only a specified user can open it. In the same manner, if a file is received from another user from whom you already have stored credentials, you can verify the authenticity of that file (and decrypt it if necessary). For more information on how the system for encrypting, decrypting, signing or verifying signatures works, see the page for Pretty Good Privacy as this is based on exactly the same algorithms and methods of operation. The specific implementation in APG relies on the Spongy Castle APIs. == Reception == After its initial release in June 2010, it has gained a strong following with over 2000 reviews and over 100,000 installs from the Google Play store. Several tutorials have been written which instruct new users in how to set up APG on an android phone. These tutorials generally reference APGs interaction with the K-9 Mail Android e-mail client. Between December 2010 and October 2013 no new version of APG was released. In the light of the global surveillance disclosures this lack of development was viewed critically by the community. In September 2013 a fork of APG was released, version 2.1 of OpenKeychain.〔(【引用サイトリンク】url=https://github.com/open-keychain/open-keychain/releases )〕 Some of the new features and improvements were subsequently merged back to APG. However, this process stopped in March 2014, while the Openkeychain project continues to release regularly new versions of OpenKeychain.〔(【引用サイトリンク】url=http://www.openkeychain.org/ )〕 As of March 2015 the OpenKeychain software is vastly superior to APG. Notable features of OpenKeychain include a modern user interface, support for NFC and the YubiKey NEO.〔(【引用サイトリンク】url=http://www.openkeychain.org/about/ )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Android Privacy Guard」の詳細全文を読む スポンサード リンク
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