Permantently delete images off Iphone and Icloud, so it cannot be restored by anyone/third party.

Hi guys I'm looking to do three things;
1. I'm looking to permantely delete a few images off my phone, so that they are not not recoverable by anyone, and I mean anyone, including authorities.
2. I have a deleted a few these same images from icloud, I want to make sure they're permnantely deleted so no third party can recover them.
3. Id prefer to delete only these images, but suggestions of factory reset will mean I delete everything. …

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