Hello sir,
I have checked all the requirements and understood what is necessary.
Actually, I have done exactly this kind of work in past. So I guess, I am the best person for you to carried out the work.
According to the task, what I understood is below:
1. You want to store Selected Emails & Attachments to Local SQLite DB, Which should be Encrypted format using AES256, right?
2. Once I store those emails, then How do User know that these selected emails are in Encrypted format?
3. Should I need to show on UI something like these email is encrypted, something kind of? If yes, then can you please share to in Private Chat session.
I have versatile experience in iOS Android development for 8 years. I have almost developed 112+ all types of domain apps. I worked are really complex and took a lot of efforts to develop and all apps are crafted since I am working. I am very confident enough to make your app successfully designed and programmed.
Best Regards,
Krunal