How can i implement SQLCipher encryption - decryption for already created physically SQLite database with added populated row, also able alterable this database via coding in iOS?

Just to close out this thread, SQLCipher does not rewrite standard SQLite databases with encryption using sqlite3_key. It is necessary for the application to use an attached database to copy data between standard and non-encrypted databases (e.g. with the sqlcipher_export() function). Please see this related post for more details: