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Lock Gerfaut so that someone at your unlocked phone or computer sees nothing of your wallets. Your wallet list stays encrypted whether the lock is on or off.

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Turn on the app lock

1

Select the App lock switch

Open Settings > Security. Gerfaut opens Turn on the app lock.
2

Pick PIN or Password

Select PIN (four to 12 digits) or Password (at least eight characters). Only a PIN opens the calculator disguise on Android.
3

Enter the secret twice

Enter New PIN or New password, then Confirm, and select Turn on. Gerfaut asks for the secret each time it opens.

Once the lock is on, Security adds Change PIN, Lock now and the calculator disguise.

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Lock and unlock

Gerfaut asks for the secret each time you come back to it. Returning within ten minutes from a file picker, a save dialog or a share sheet that Gerfaut opened needs no secret. Select Lock now in Settings > Security to lock it by hand. While a lock is set, Android keeps Gerfaut out of screenshots and shows a blank card in the recent apps, or the calculator under the disguise.A notification still names the wallet and gives the amount while a lock is set. To hide both, turn off Show wallet and amount.
On the Locked screen, enter the secret and select Unlock. After three wrong attempts, Gerfaut makes you wait five seconds, then doubles the wait at each failure, up to five minutes.

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Change or turn off the lock

Select Change PIN or Change password to replace the secret. Select the App lock switch again to turn the lock off. Both ask for the current secret.

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Unlock with biometrics on Android

1

Select the Unlock with biometrics switch

The switch shows when a fingerprint or a face is set up on the phone.
2

Enter your PIN or password, then confirm the system prompt

From then on, the lock screen opens the system prompt on its own. Select Use fingerprint or face to bring it back. Gerfaut never sees the biometric itself.
Only a biometric that Android rates as strong unlocks Gerfaut. Many face unlocks that use the front camera are rated weak, since a photo can fool them. On a phone with a weak one only, the switch stays greyed out and says why. When the fingerprints or faces on the phone change, biometrics stop opening Gerfaut, so nobody can add their own finger to get in. Unlock with your PIN or password, then turn the switch on again in Settings > Security.

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Disguise the app as a calculator on Android

With the disguise on, the PIN is the only way into Gerfaut. If you forget it, only a backup brings your wallets back.
1

Select Disguise the app

It needs an app lock of the PIN kind. The sheet lists what changes, starting with the launcher, which shows Calculator instead of Gerfaut.
2

Select Turn on the disguise

From Android 13, the recent apps keep no picture of Gerfaut while it is disguised. On an older Android, clear your recent apps once, because Android may keep an older Gerfaut thumbnail.
3

Open Gerfaut from the calculator

Type your PIN on the calculator and press =. A wrong PIN gives a number like any calculator, with no hint. After three wrong PINs, the right one also gives a number until the wait ends.
The Disguise the app sheet over the Security screen on Android: the list of what changes, the warning that the PIN is the only way in, and the Turn on the disguise button.

The sheet lists everything the disguise changes before you turn it on.

Turning the disguise on changes how Gerfaut tells you about transactions:
  • Notifications: Gerfaut posts none, and clears the ones already in the notification shade.
  • Live: If Live is on, Gerfaut turns it off and sets Check for transactions to Every 15 min. Background checks post nothing either.
  • Widgets: Gerfaut removes its widgets from your home screen.
  • Notification history: If you turned on Android’s notification history, it still lists Gerfaut’s earlier notifications under its name. Turn the history off in Android’s notification settings to clear it.
In Settings > Notifications, New transactions shows off and every notification setting stays greyed out while the disguise is on. The line under the switch says why. Once you turn the disguise off, New transactions is back as you left it.
The Notifications screen on Android under the disguise: New transactions off and greyed out, with the line Off while the app is disguised, Show wallet and amount greyed out, Check for transactions on Every 15 min, and Widgets are off while the app is disguised.

Under the disguise, the notification settings stay greyed out and say why.

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Turn off the disguise

Select the Disguise the app switch again, or turn the app lock off. Gerfaut does not restore Live or the widgets on its own:
  • Live: If you used Live, select Live again under Check for transactions in Settings > Notifications.
  • Widgets: The disguise removed them from your home screen. Add each one again.

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Start over after a forgotten PIN or password

Nobody can reset a forgotten PIN or password, since Gerfaut keeps no copy of it. Start Gerfaut again on an empty vault, then restore your last backup.
Only the wallets in your backup come back. Add any other wallet again from its descriptor, extended public key or address.
1

Uninstall Gerfaut

In the Android settings, open the list of apps, select Gerfaut and uninstall it.
2

Install Gerfaut again

Follow Install on Android.
3

Restore the backup

Follow Restore a backup.