APKs - How To Spot Fake Signatures

Nov 8, 2011

How do you know that an APK signature is not a fake?

What is to stop somebody unpacking an APK, inserting malicious code, repacking the APK, and signing it with a new key that simply copies all of the fields from the original publishers key (company name, locations, etc...)? Obviously it is not the same key, but all of the data the end user would see appears to be the same.

If the original key had to be signed by a trusted authority (as is the case with trusted ClickOnce applications for instance), you could have some certainty that this key was issued to the original company. Similarly, if publishers made their public keys available from a trusted outlet (e.g. google.com/android/keys) you could check that they were correct from the fingerprint.

It would appear that signing only gives you the illusion of security, which is actually worse than no security at all.

APKs - How to spot fake signatures

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I see a Sprint Hotspot app on the Epic. What happens if you press it? Does it auto-activate the hotspot, or does it check to see if you have the add-on plan before it can be used?

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I do a lot of Android app testing. I use my regular phone, where I have my contacts and my regular gmail account. I never used a credit card on this account. I mostly use APK files to install the apps. I have 2 questions:

1. can an app display some permissions when installing, but have others hidden permissions ?

Example: instal APK file > says permissions "Network access" and that's it.

Can this app also read my data or make phone calls, even though those permissions were not displayed ?

What is I use an app to display ALL permissions ? Can it really display all or is there an way to still have hidden permissions ? I use Android 2.3.7 root and 4.1 no root.

2. Can an app make unauthorized hidden operations, like place phone calls or send texts or steal my gmail password ?

Like I said, I never used a credit card, so at least that's not a problem. But I have my SIM card - can an app place a value added call or SMS (I don't know the exact English term - expensive call), without me knowing about it ?

Or compromise my Gmail account ? I have an alternate email for recovery.

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Android :: Re-installation Failed Due To Different App Signatures / How To Fix?

Apr 14, 2009

Out put by eclipse: CODE:.. adb uninstall com.android.music say Failure.

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Can the manufacturer reportan incorrect amount of RAM and tweak the kernel to use only part of it?

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Motorola Droid X :: Sent From IPhone Slam Signatures

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I really hate the 'Sent from my iPhone' signature (I have some extra hate for Apple ) and looking from some witty signature to send on the Droid X to all my Apple fanboy/friends.

Looking for something like:

Sent from my 'Steve Jobs controlled'-free phone


Not sent from my iFail

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Sony Ericsson Xperia X10 :: Text Signatures

Sep 9, 2010

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Feb 12, 2010

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Oct 1, 2010

I have an Java class with a static final method getAll:


Now I want to hand in null as a value for the where statemant so that it will just be ignored later on in the code. Anyway in the testcase for this method I have: Vector<Category> categories = Category.getAll(context, null);

Which then in turn gives me a NoSuchMethodError. I don't know exactly why it does that. The only thing I could imagine is that the null I hand in would not match the signature of the above method. But how can I overcome this? I already thought of overloading. But this would just end in rewriting most of the code. At least when I do it, how I think.

This is the stack trace I get:


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I have a MI2 clone with Fake Miui v4

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Apr 1, 2010

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Android :: Recommended Encryption Combination For Digital Signatures

Jul 3, 2010

I have finally - after days and days of agony - figured out that I need two forms of encryption for my Digital Signatures Project. The first will will be symmetric (AES) and will encrypt the license data and the second will be a asymmetric (RSA) an will encrypt the symmetric key. Can someone give me pointers on the best methods to use for Android.

For the public/private keys I am using: "RSA/ECB/PKCS1Padding"(I head ECB is bad so what should I use?, what about the PKCS1Padding - shoudl I be using PKCS5Padding?)

For the symetric keys I will probably use: "AES/?/?" (What mode and padding should I use?)

The provider: "BC"

RSA Keysize: 1024 (I tried 2048 but it didn't work for some reason)

AES Keysize: ?

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Sep 15, 2010

I want to develop an fake call application in android. After clicking on button i have to receive a fake call with in a given time period. Is there any way to do this..
any clues or sample code...?

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Sony Ericsson Xperia X10 :: Ignore Dates Of 2.1 Update On Official SE Page-Fake?

Nov 2, 2010

I don't know if is this true but on official page SE in comments one of moderators wrote:


says:November 2, 2010 at 2:56 pm

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Samsung Moment :: Setup Separate Voicemail Notification / Signatures In Default Mail App?

Nov 7, 2009

Can someone help out a android nob here? Is there a way to set up a separate (hopefully repeating) audible notification for voicemail? Though to me this would seem like a no brainer item, I can't seem to find it.

Also, while I'm at it. Is there a way to set up signatures in the default mail app?

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HTC EVO 4G :: Using My Evo As Hot Spot

Jun 6, 2010

Outside in the garage..cause it was raining. Using my Evo as a hotspot for my iPad enjoying a beverage and Trolling the forums..life is good.

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