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Secure Erase with iShredder 5?
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You'll want to get something like iShredder that overwrites the data- ordinary deletion simply gets rid of directory files, not the files themselves, which stay there until overwritten. I've used iShredder but there are plenty of similar apps on the play store.
iShredder: https://play.google.com/store/apps/details?id=com.projectstar.ishredder.android.standard
Phlebitis?
Nixon's bbaaaaaaaccckkk!
Sorry.
This might give you some ideas:
https://security.stackexchange.com/questions/175968/how-to-secure-erase-files-and-folders
https://play.google.com/store/apps/details?id=com.projectstar.ishredder.android.standard&hl=en
Unfortunately, complete erasure with a phone may be difficult, since there's OS etc to deal with.
Multiple factory resets perhaps?
The only way to be sure is to physically destroy the device, after erasure.
Then there's the question of any cloud storage or backup.
I've used apps like this in the past before I sell my old phones... https://play.google.com/store/apps/details?id=com.projectstar.ishredder.android.standard
You can get similar apps for windows and Mac. Basically fills your free space with data to overwrite the deleted data. However, if you're phone is encrypted, I think that's normally enough. I go above and beyond to make myself feel better.
Unfortunately, I don't know any certified software for mobile, but you could emulate their function as follow:
- Encrypt your device (if it was not)
- Make a wipe data and factory reset from the recovery mode
- Download or transfer very large files (such as 10-15 Linux distro ISOs or whatever of the amount of GBs of data) to your device storage
- Redo a wipe data and factory reset from the recovery mode
If you repeat this cycle 3-4 times It might be enough to clean your smartphone. You have to perform this cycle because the wipe data feature included in the smartphones might not be enough to clean the slack space.
If you want to add more steps you could opt to download a couple of apps like https://play.google.com/store/apps/details?id=com.projectstar.ishredder.android.standard, launch them to wipe your data and then perform a wipe data and factory reset from the recovery mode.
The aim of these process is to overwrite all the possible slack spaces, in order to make quite impossible to recover your previous data.
Folosesc iPhone, deci nu am problema asta (default encryption FTW!).
Pentru Android, da-i un factory wipe si apoi instaleaza o aplicatie gen iShredder ca sa iti rescrie spatiul liber cu zero-uri. Daca este paranoic, fa vreo 2-3 pass-uri.
Daca esti super paranoic, fute-i un root si foloseste adb sa clonezi partitia interna pe comp, monteaz-o si foloseste photorec sa vezi daca mai se poate recupera ceva (cel mai probabil nu).
I'm not exactly sure if that's possible with a phone (without root; with root, you could use dd if=/dev/zero of=/sdcard/junk.bin). You can try an app like iShredder, but I'm pretty sure that you would have to have the file there for it to be able to securely delete it.
Wiping the free disk space (aka zeroing it out, because you're writing zeros over the free space) is particularly difficult on flash storage devices because it's limited by the floating gate slowly accumulates electrons, causing a gradual increase in the storage transistor’s threshold voltage which manifests (in its most observable form) as increased programming time and, eventually, an inability to erase the cell.
Your best bet is to encrypt your phone and then perform a factory reset.
Use iShredded to securely delete files and then use overwrite freespace option.
Vou testar.
Achei esse também:
https://play.google.com/store/apps/details?id=com.projectstar.ishredder.android.standard
You can try something like this: https://play.google.com/store/apps/details?id=com.projectstar.ishredder.android.standard