File is not a database:

[developernotes]

Hello @naser_jafari

We have put together some guidance on migrating from a plaintext SQLite database to a SQLCipher encrypted database. Please review this post for more information:

How to encrypt a plaintext SQLite database to use SQLCipher (and avoid “file is encrypted or is not a database” errors)

We often field questions about how SQLCipher encryption works. In one common scenario, a developer wants to convert an existing standard SQLite database to an encrypted SQLCipher database. For example, this might be a requirement for an application that was not previously using SQLCipher, and must convert an insecure database to use SQLCipher full database encryption during an upgrade. In such cases, developers may initially attempt to open a standard SQLite database and then call sqlite3_key o…