Chain Pass

A project built with JetBrains Compose Multiplatform to save and manage passwords.

Security

The cryptographic system consists of the ChainKey(SecretKey) with which the ChainLink(Password) are encrypted, and the authentication system that consists of the ChainKey(PrivateKey) validation.

The application asks the User to type the Key together with a randomly generated Salt, from which theSecretKey is derived, then the Key together with the SecretKey derives the PrivateKey that is saved to the Database.

Chain(Key) -> Hash(Key,Salt) = SecretKey -> Hash(Key,SecretKey) = PrivateKey -> Chain(PrivateKey)

The application asks the User to type the Password that is encrypted with the SecretKey together with a randomly generated IV, obtaining thePrivatePassword that is saved to the Database.

ChainLink(Password) -> Encrypt(Password, SecretKey, IV) = PrivatePassword -> ChainLink(PrivatePassword)

Known vulnerabilities

• Access to the User device allowing the attacker to steal or delete the Database.

There is no way the attacker can decrypt ChainLink(PrivatePassword) because the Chain(SecretKey) is never leaked.

Distribution

To package applications run the following commands with Gradle:

• Create Desktop binaries with gradlew composeApp:packageDistributionForCurrentOS
• Create Android APKs with gradlew composeApp:build

Packaging requires JDK 17 or later to be installed.