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Using file from memory as normal file

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I have a problem which struggles me since few days. I want to use sqlite database, read and write info there WITHOUT having it dropped (unencrypted) on disk. I want the database file to be encrypted with let's say RC4, and upon launching my app, the db file should be:

1. Loaded into memory

2. Decrypted in memory

3. App should access database data directly from memory

4. If there are any changes in database, app should encrypt the 'memory database file' and write it to the disk as encrypted database.

Can someone give me a hint, for example doing the above in Python? As I know, the database can be read only from some disk path like C:\db.sqlite, but how to do it when file is loaded in memory??



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