Should you encrypt your application preference file ?

Do you know there are websites which provides you with preference file where you can get unlimited coins or premium cash for any games. You don't need to root your iPhone or an Android phone. Only software you need to download is iFunbox. There are many other software's like iFunbox but i have checked with only iFunbox.

What is preference?
Preference is a file where you save most of the data of  game or application in iOS. Most of the game developer don't encrypt the preference which lead to most hackers changing the values thereby increasing the coin or premium cash count.

What does iFunbox do?
iFunbox is a software which reads package contents of App store build and allows you to write certain data too. Its like File manager for Android but the software is for Mac. iFunbox does many things, but i am concentrating only on preference part, just Google to find out more about it.

What does a hacker do with preference?
Hacker just downloads the preference file from library or any other place where the developer has saved the preference file through iFunbox and just changes the value of the preference.

Why is it easy to change the preference ?
Most developers would give names like Coins, Cash, power-up etc strings in preference where even a noob can find out.

As a tester we have to make sure that preference file should be a non editable file. Ask you developer to encrypt the preference file before providing the build to App-store to ensure there wont be any preference hack in your application. Make sure you have this case in your TSP or release checklist.

P.S
I have not provided the link to software nor the websites because its not legal thing to do :/

10 general questions asked during a test Audit.

1. Tell me about your application/game?

2. Which all platforms does your application support?

3. Which is the least OS and hardware supported by your application?

4. What are your roles and responsibilities?

5. Tell me about your team ? Who is the PM, TA, SE, BCP of your project?

6. Can you tell me what are all the test strategies you carry out during testing?

7. What are all the documents prepared for your application/game?

8. What is file size of your application?

9. What document have you referred to write the TSP/SmTP/STP?

10. Is it localized to any language? What document do you refer?

Basic use of Instruments for iOS and Mac application

Instrument tools is used to collect performance data of your iOS or Mac application. It also has a record option to record the whole data collected from your application. I use instruments tool to check with real memory and fps. Memory through Activity Monitor and fps through core animation. 

1) How do i download Instrument tool ?

- Instrument tool comes with Xcode 4 toolset. Xcode can be downloaded from Mac App store

Link: https://itunes.apple.com/in/app/xcode/id497799835?mt=12

2) How do you check with real memory and virtual memory?

- Select Activity Monitor through library and then select the target application and hit record button. In log section you would be listing with real memory and virtual memory of the application. You can also check with CPU utilization too.

3) Where is library, how to select target application and where is record and log section?

- Screenshot would explain you everything

 4) How do you check with FPS?

- Select Core animation in library section and then select the target application and then hit record button. You would be listed with FPS of your application.

LDPI MDPI HDPI XHDPI XXHDPI

Brand	Devices		Pixel Per inch (ppi)
Samsung	Samsung Galaxy Ace	mdpi	165
	Samsung Galaxy Tab 10 inch tablet	mdpi	149
	Samsung Galaxy Tab 2 10 inch tablet	mdpi	149
	Samsung Galaxy S	hdpi	233
	Samsung Galaxy S2	hdpi	217
	Samsung Note	xhdpi	285
	Samsung Note 2	xhdpi	267
	Samsung Galaxy S3	xhdpi	306
	Samsung Nexus 10 inch tablet	xhdpi	299
	Samsung Galaxy S4	xxhdpi	441
	Samsung Galaxy S5	xxhdpi	432
Micromax	Micromax Canvas 2 A110	hdpi	196
	Micromax Canvas Doodle A111	hdpi	185
	Micromax Canvas 2 + A110Q	hdpi	196
	Micromax Canvas HD A116	xhdpi	294
	Micromax Canvas 4 A210	xhdpi	294
	Micromax Canvas Magnus A117	xhdpi	294
	Micromax Canvas Turbo	xxhdpi	441
HTC	HTC Wildfire	mdpi	125
	HTC Desire	hdpi	252
	HTC Desire S	hdpi	252
	HTC Sensation	hdpi	256
	HTC Desire X	hdpi	233
	HTC One S	hdpi	256
	HTC One V	hdpi	252
	HTC Nexus One	hdpi	252
	HTC One X	Xhdpi	312
	HTC One	xxhdpi	469
	HTC One X+	xhdpi	312
	HTC One M8	xxhdpi	441
Google	Google Nexus One	hdpi	252
	Google Nexus S	hdpi	233
	Google Nexus 7 2012	hdpi	216
	Google Nexus 7 2013	xhdpi	323
	Google Nexus 4	xhdpi	318
	Google Nexus 10	xhdpi	299
LG	Lg Optimus one	mdpi	180
	Lg Optimus S	mdpi	180
	Lg Optimus V	mdpi	180
	Lg F70	mdpi	199
	Lg G2 mini	hdpi	234
	Lg L90	hdpi	234
	Lg G Pad	hdpi	273
	Lg Nexus 4	xhdpi	318
	Lg Nexus 5	xxhdpi	455
	Lg G2 mini	hdpi	234
Sony Xperia	Sony Xperia mini	mdpi	192
	Sony Xperia P	hdpi	275
	Sony Xperia S	xhdpi	342
	Sony Xperia J	hdpi	245
	Sony Xperia Arc	hdpi	233
	Sony Xperia Pro	hdpi	265
	Sony Xperia Z	xxhdpi	441
	Sony Xperia Z2	xxhdpi	424
Motorola	Motorola Droid	mdpi	265
	Motorola Defy	hdpi	265
	Motorola Razr XT910	hdpi	256
	Motorola Moto G	xhdpi	326
	Motorola Moto X	xhdpi	312

If you dint find the device which you were searching please check this link to find few more devices which were added.

http://qualitytestingtips.blogspot.in/2016/02/brand-devices-pixel-per-inch-ppi.html

How do you identify ?

You identify the category by just checking the DPI

ldpi - 120 dpi

mdpi - 160 dpi

hdpi - 240 dpi

xhdpi - 320 dpi

xxhdpi - 480 dpi
xxxhdpi - 640 dpi

Will be updating with few more devices soon :) help me out if i am wrong or you can add some more devices in list if you know in which category the devices falls in.