Why you shouldn't install banking apps on rooted phones

[WoKoschekk]

Nothing is impossible

Then try to fake a SHA256 checksum and you'll see that is truly impossible.

 

[blackhawk]

Damn straight. A paper and pencil will never run out of batteries, and there isn't a script kiddie in the world that can hack a locked filing cabinet. No one can drain your accounts if there isn't money in them, and they can't steal your identity if you don't have an online presence.

Physical security is the only real security.
Sometimes I go for hikes in the desert and forget my phone. Do I turn around to get it? Nope, not needed. I tend to ignore my smartphone when out anyway. Quiet waking time is important aspect of life never learned by many of today's "always available" kids.

What amuses me are the people who invest a lot of time in their smartphone but fail to regularly and redundantly backup their critical data. Then expect someone to be able to pull that data back from wiped and/or encrypted data hell

 

[blackhawk]

Then try to fake a SHA256 checksum and you'll see that is truly impossible.

That's what the WW2 Nazis and Japanese encoders thought. Didn't work out too well...

 

[WoKoschekk]

That's what the WW2 Nazis and Japanese encoders thought. Didn't work out too well...

Grab a paper and your pencil and start calculating the checksum yourself. The encoders would certainly have used better code back then if a modern PC had been around.

 

[TheMystic]

but with managers such as Magisk, it's not possible for a process to get root permissions unless you specifically authorize it, unless there's a huge back door in your kernel.

As I mentioned earlier, I have a lot of respect and appreciation for the honest developers here who have helped make the Android experience so much better.

But at the same time **** happens and it may be too late before one realises. It is always a good idea to play it safe.

If I have to use my banking and very confidential stuff on a phone, it will be completely stock.

we aren't about to give up freedom for security.

We don't really give up freedom on an Android phone. It is extremely versatile in stock form too!

Every project is open source and documented on github.com

Is there any reliable entity auditing the codes continuously?

I can release a malware and keep the code open source. There is a good chance a lot of damage would be done before anyone finds it.

I grew up without smartphones, I didn't have a cell phone until I was 18, and it was just a flip phone.

Was that a choice or just the times you grew up in?

today's "always available" kids.

Grab a paper and your pencil and start calculating the checksum yourself. The encoders would certainly have used better code back then if a modern PC had been around.

I have read somewhere that a country's military and intelligence services have access to tools and technologies that are anywhere between 10 to 20 years ahead of what is commercially available or even known.

So what you think is impossible is true only for the technology that is currently known to you. But for advanced technologies that you aren't even aware of, this could be like a cup of tea.

So don't assume and take for granted that something is totally safe. It is safe only until you aren't a target.

 

[blackhawk]

Grab a paper and your pencil and start calculating the checksum yourself. The encoders would certainly have used better code back then if a modern PC had been around.

What if I grabbed a quantum computer instead?
The evolution of a technology is what drives their countermeasures. If those countermeasures don't exist today, they soon will and vice versa.
Spy vs Spy, ever read that comic strip?

The code breakers used the best available computers at that time to reduce their work load.
Both the Japanese and Nazis failed because of their over confidence in their encryption. It was used frequently, easy to intercept and was of the highest priority to break. It had a huge bullseye on it... Changing the base system and codes frequently could've changed the course of the war. What if we had had no advanced waring of Midway?

 

[V0latyle]

Btw 256 bit encryption is ridiculously secure. 2 (binary) to the power of 256 = 115792089237316195423570985008687907853269984665640564039457584007913129639936 possibilities. You can't brute force that in a million years with all the computing power on the planet combined. That's why breaches rarely involve breaking encryption, but rather "social" methods to gain the key (password) used for the encryption. You can't break into the connection between a user and their bank, but you can pretend to be their bank and obtain their credentials.

The reason we were able to break German encryption was because we captured critical components such as the Enigma machine. We basically got lucky. The Japanese used poor encryption that made it easy to recognize patterns and cycles.

Was that a choice or just the times you grew up in?

Both

 

[blackhawk]

Btw 256 bit encryption is ridiculously secure. 2 (binary) to the power of 256 = 115792089237316195423570985008687907853269984665640564039457584007913129639936 possibilities. You can't brute force that in a million years with all the computing power on the planet combined. That's why breaches rarely involve breaking encryption, but rather "social" methods to gain the key (password) used for the encryption. You can't break into the connection between a user and their bank, but you can pretend to be their bank and obtain their credentials.

The reason we were able to break German encryption was because we captured critical components such as the Enigma machine. We basically got lucky. The Japanese used poor encryption that made it easy to recognize patterns and cycles.


Both

I think the Enigma code was cracked long before the first one was obtained.
In large part it was operational mismanagement that rendered it useless.

One hallmark of important codes that are broken is keeping that breach a secret to exploit its maximum potential and damage. History tends to repeat itself... never feel you're too secure.

 

[WoKoschekk]

Is there any reliable entity auditing the codes continuously?

An independent "source-code-reviewer"? No. Are there generally people who do this with other source code?

I can release a malware and keep the code open source. There is a good chance a lot of damage would be done before anyone finds it.

Yes, that's right. But you are facing this dilemma also in the Play Store, Microsoft Store, Amazon App Store, and a few others.
It would be pretty stupid if you crash the entire LineageOS project because you have installed malware. With that you have the legendary status for sure.

 

[WoKoschekk]

Btw 256 bit encryption is ridiculously secure. 2 (binary) to the power of 256 = 115792089237316195423570985008687907853269984665640564039457584007913129639936 possibilities

That's not a SHA256 checksum.

 

[V0latyle]

That's not a SHA256 checksum.

Of course it's not a checksum. I said exactly what it is. That's the number of possible combinations of a 256 bit binary string.

To determine the number of possibilities of any string, you take each digit's number of possibilities (2 for binary) to the power of however many places there are. So, since each binary bit in a 256 bit string has 2 possibilities, it's 2^256.

One nibble (four bits) has 16 possibilities: 0 to F

One byte (eight bits) has 256 possibilities: 2^8, 00 to FF. Or, for nibbles, 16^2

One word (two bytes) is 16 bits and has 65,536 possibilities: 2^16, 0000 to FFFF. Since there are two bytes with 256 possibilities each, this can also be 256^2

Two words (four bytes): 32 bits, 2^32 = 4,294,967,296, 00000000 to FFFFFFFF, 256^4
And so on.

256 bits means you have so many possibilities that it would take literally the entire computing power of the entire planet several billion years to break. 256 binary choices, 32 bytes with 256 potential combinations each:
115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936 possibilities.

 

[TheMystic]

An independent "source-code-reviewer"? No. Are there generally people who do this with other source code?

Yet people place too much reliance on open source projects. Everyone thinks someone else would have checked it but in reality no one would have bothered.

The mainstream ones such as OEM software tend to be under a lot of scrutiny because they cater to a very large number of devices. So anything suspect would be caught quite quickly.

But you are facing this dilemma also in the Play Store, Microsoft Store, Amazon App Store, and a few others.

Atleast they have a vetting process in place that will likely pick something up. With apps and mods that don't list in these stores, they are pretty much free to do what they want. Being open source isn't synonymous to being secure. That is a false presumption.