Banana Split uses Shamir's secret sharing to make your paper backups more resilient and secure.
After you type in your secret into Banana Split, it will be encrypted with a autogenerated passphrase and split into N QR-codes, ready to be printed out. You'll need N/2+1 of those printouts to reconstruct the secret, and then the passphrase to decrypt it.
Banana Split tries to protect your secret from the attack vectors like "attacker is able to intercept everything you're sending to your printer", and that's why you'll have to write down the passphrase on your printouts by hand.
Banana Split is a self-contained HTML page, and should only be opened from your local Documents folder, while browser is in the Offline mode — this way the risk of compromise will be minimal.
Recovery can be done on any device with a webcam — just show your QR codes to the webcam and follow the notifications on screen in the process.
Saved to Keybase.
Shamir Secret Sharing Scheme in single page which can be used offline.
The Python keyring lib provides an easy way to access the system keyring service from python. It can be used in any application that needs safe password storage. Works with iOS Keychain, Freedesktop's Secret Service, KWallet 4 and 5, and Windows Credential Locker. Pluggable back-ends.
A utility that makes it easy to back up your OpenPGP keys on dead trees by extracting the secret bytes and printing them out.
A utility used to extract user credentials and other secrets from the Windows registry hives offline.
An excellent writeup of how Shamir's Secret Sharing Scheme works. There is even a simple demo linked off of this page. This is also the homepage of SSSS, which is a command line utility that implements SSSS for secrets (up to 128 characters in length).
A website of secret menus at fast food restaurants around the country.