HACKER Q&A
📣 mandeepj

How to Harden Your Phone?


Inspired by this thread - https://news.ycombinator.com/item?id=45106903

Whenever I hear the Pegasus app or read about it at HN, I get a bit worried. So, today was that day again.

I'm sure we have cybersecurity experts, security researchers, and Infosec pros here at HN. What do you recommend to keep your phone, especially an iPhone, hardened as a brick? Came across the following article, although a bit dated, which suggests not using FaceTime and iMessage. But in another search, I found iMessage is more secure than just plain old SMS/Text. I'm more worried about zero-click exploits.

https://usa.kaspersky.com/blog/how-to-protect-from-pegasus-spyware/26103/

Just a thought - would having a firewall[0] on your phone to block any incoming request or quarantine it for review will work? A response to a user-initiated request is different than an independent request coming to your phone. A clarification to avoid mixing both.

Also, a traffic monitor[1] to watch excessive outgoing traffic or excessive hard drive reads to detect if you are compromised.

I've also been thinking about developing a custom Secure Vault app, more like an isolated Sandbox; I'll share more details about it if I think I can pull it off. Any pointers, books, articles, or videos are greatly appreciated.

Security is a fascinating topic; Let's discuss.

[0] : https://apps.apple.com/us/app/guardian-firewall-vpn/id1363796315

[1]: https://apps.apple.com/us/app/traffic-monitor-with-widget/id482570191

[2]: https://www.youtube.com/watch?v=1p0Xm-Opzjg (Catching NSO Group's Pegasus spyware)

[3]: https://help.apple.com/pdf/security/en_US/apple-platform-security-guide.pdf

[4]: https://www.reuters.com/technology/cybersecurity/governments-spying-apple-google-users-through-push-notifications-us-senator-2023-12-06/


  👤 runjake Accepted Answer ✓
This guide for iPhone and Android is a good start. Not all their recommendations are obvious.

https://www.cisa.gov/sites/default/files/2024-12/guidance-mo...

For a deeper guide, check out the CISecurity benchmarks for your smartphone. They go a bit deeper. But the CISA guide will get you most of the way there.

https://www.cisecurity.org/cis-benchmarks


👤 k310
How about this idea?

Since a great deal of mobile usage is at home, how about a firewall of the home network as an 80/20 kind of solution? (YMMV) You might include a VPN.

This does not help away from home.

I have asked friends to use Signal for its many features, but I'm in low-tech company lately. They need a kick. Signal might address your messaging needs, and TBH, is better than imessage or FaceTime in mixed company. "Green people". Mainly because it is entirely crosds-platform.


👤 max_
At the bare minimum, ditch the iPhone.

Get a pixel

Install grapheneOS


👤 2rsf
Who and what are you trying to protect from? ICE/NSA will hack your phone, and all you can do as an amateur is to make their life harder (and raise their suspicion even more)

👤 reify
I alway found that dipping it in some araldite epoxy resin works great

Basically, squeeze both tubes, part A and part B, into a bowl, mix well.

lay your phone on a flat surface and pour the mixed araldite over the phone.

smooth and level the araldite with a plastic tool.

let dry.

sorted!