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Strong passphrase experiment

By WIlliam Cheswick

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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.

What's New in Version 1.1

- Improved user interface
- Key stretching option to experiment with optional delays
- Keychain storage of passphrase until it is memorized
- Various bug fixes
- IOS 10 stuff.


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Strong passphrase experiment
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This app is designed for both iPhone and iPad
  • Free
  • Category: Utilities
  • Updated:
  • Version: 1.1
  • Size: 1.4 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

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