Might want to read about CRCs... to understand how it works: http://en.wikipedia.org/wiki/Cyclic_redundancy_check
On Oct 1, 3:04 pm, Moto <medicalsou...@gmail.com> wrote: > You do a CRC32 over the actual application file, *.apk. Open the file > and get the byte stream. Now it's tricky to do that and than hardcore > the CRC32 number in your app because it will change the value of the > app computed CRC32 value. That is why he suggested to store it in a > remote server... > > For example: > > CRC value of the apk = 0xABCDABCD > > You would store that on your server 0xABCDABCD and use it to make sure > nothing was changed inside the app... > > -Moto > > On Sep 28, 2:30 am, Asker <mallorc...@gmail.com> wrote: > > > Hi, > > > Following the examples given by Johns Trevor in order to secure > > Android LVL Applications (http://android-developers.blogspot.com/ > > 2010/09/securing-android-lvl-applications.html), I've been stucked on > > one only particular issue. > > > Indeed, here is the matter: > > The most obvious mechanism is to use a lightweight hash function, such > > as CRC32, and build a hash of your application’s code. You can then > > compare this checksum with a known good value. You can find the path > > of your application’s files by calling context.GetApplicationInfo() — > > just be sure not to compute a checksum of the file that contains your > > checksum! (Consider storing this information on a third-party server.) > > > Howether, I can't find what I must use in my code to detect an > > "unwanted" modification inside it. > > java.util.zip.CRC32 crc32 = new java.util.zip.CRC32(); > > crc32.update(whatPutInHere); > > > I've tried many method related to context.GetApplicationInfo() but no > > one seems to deliver something that change as soon as the code is > > modified. > > > Has someone already succeed on CRC32 checksum implementation? > > > Regards. > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
