Strong passphrase experiment at App Store analyse

App power index: 100 (based on ranks around App Stores today)
Utilities Reference
Developer: WIlliam Cheswick
Price: 0 free
Current version: 2.0, last update: 7 years ago
First release : 12 May 2014
App size: 1.66 Mb
4.8 ( 2848 ratings )
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Estimation application downloads and cost

> 2.2k
Monthly downloads
~ $ 900
Estimation App Cost


This is an experimental app to see if there is a way for users to remember pass phrases that correspond to long, computer-generated random keys. The random keys generated go up to 105 bits long (hence, the name.) Random keys are generated by /dev/random, though the next version will include additional entropy from the video camera, a la the lava lamp generation from many years ago.

The keys are encoded using one of many non-secret dictionaries, and the user is expected to eventually learn a phrase of pets seven random words.

These keys are used to lock a simple memo-pad type file with AES256 encryption and PBKDF key derivation techniques. The encoded envelope is saved as a UTF-8 text file (extension .105) that can be stored, mailed, and installed.

Note that this app does not envision storage of any keys permanently on a computer, but the keychain may be used until the passphrase is learned.
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Available in countries
Country Price
Canada free
China free
France free
Germany free
Italy free
Netherlands free
Portugal free
Spain free
Poland free
UK free
India free
Japan free
Poland free
Russia free
Turkey free
USA free
Korea, Republic Of free
Ukraine free
Available for devices
iPhone3GS, iPhone4, iPodTouchFourthGen, iPad2Wifi, iPad23G, iPhone4S, iPadThirdGen, iPadThirdGen4G, iPhone5, iPodTouchFifthGen, iPadFourthGen, iPadFourthGen4G, iPadMini, iPadMini4G, iPhone5c, iPhone5s, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPhone6, iPhone6Plus, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPodTouchSixthGen, iPhone6s, iPhone6sPlus, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPhoneSE, iPhone7, iPhone7Plus, iPad611, iPad612, iPad71, iPad72, iPad73, iPad74, iPhone8, iPhone8Plus, iPhoneX,