I guess you haven't gone through the 
http://developer.android.com/guide/publishing/app-signing.html
properly.

"It's mentioned there
To verify that your .apk is signed, you can use a command like this:

$ jarsigner -verify my_signed.apk
If the .apk is signed properly, Jarsigner prints "jar verified". If
you want more details, you can try one of these commands:

$ jarsigner -verify -verbose my_application.apk
or

$ jarsigner -verify -verbose -certs my_application.apk
The command above, with the -certs option added, will show you the
"CN=" line that describes who created the key."

--
Rahul

On Sep 14, 6:12 pm, Rashmi <rashmi....@gmail.com> wrote:
> Hi,
> How does the android system will check the valid certificate while
> installing an apk. How does it generates the signature and Where does
> it will store the signature of the apk installed.
>
> Please let me know about how to validate the certificate and signature
> before installing the apk.
>
> Thanks,

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