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Bcrypt, the default password hashing algorithm supported by PHP’s password_hash() function.Secure hashing algorithm ( SHA-256), the hashing algorithm underlying each round of the above PBKDF2 operation.Password-based key derivation ( PBKDF2) to expand human-readable passphrases into keys appropriate for use in other cryptographic operations.The system is built atop several, well-studied cryptographic primitives: I’ve also taken steps to fully containerize this project and have now launched it as a publicly available project – Project Swordfish. Nothing in the server can see his password, encryption key, plaintext data, or any information that could be used to violate the secrecy of the information. The Redis datastore holds only encrypted data, and the PHP application merely provides an interface to that data. send me the link in email and text me the password). The goal was to allow him to store an encrypted secret and send me a secret link directly, then communicate his user-selected password out of band (i.e. An in-memory Redis datastore used to store the secrets.A PHP application used to power an API for both creating and retrieving secrets.A static HTML page using in-browser Javascript and the SubtleCrypto API to encrypt a secret using a key derived from a password of your choice.This service was comprised of three elements: Project SwordfishĪ little while later, I sent him an Ngrok link to demo a service running on my local machine. On his urging, I took it upon myself to build an alternative. A bit like driving an M1 Abrams tank to pick up groceries – you’ll definitely get there, but is this really the best way to run errands? The app worked as advertised, but it repurposed a system they’d built for a completely different purpose. In this case, end-to-end encryption is the best approach as your data is encrypted by you before the server sees it, and it’s only ever decrypted by the recipient.Įven if the server wanted to spy on you, they’d be blocked by the encryption around the secret!Ī few months ago, a friend and colleague introduced me to a fully end-to-end encrypted secret sharing app his team had built. If you can’t trust the third party exchanging or storing the secret data, you need to take further precautions. So again, how secure are secret sharing services? Really? Secure secret sharing However, both your secret and your passphrase are sent to the server in plaintext, meaning the site owner can see them! With One Time Secret, the system uses your passphrase to encrypt the secret when it’s stored on disk. Whenever you use a system like One Time Secret (or the numerous clones out there on the web) you have to trust the third party running the system to not eavesdrop on your secrets.
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For the longest time, I used services like One Time Secret because it allowed for large secrets, automatic expiration, and an optional passphrase to protect the secret.īut how secure are these services? Really? I’ve always been on the lookout for new, innovative ways to empower secret sharing between non-technical folks.