A first guess is that you happened to modify a part of the headers which pointed to the certificates so that it could not detect a valid certificate or signature in the APK, and thus gave that error. In general I wouldn't expect predictable results by randomly modifying the APK, outside of it no longer being a valid signed APK.
On Mon, Nov 15, 2010 at 4:22 PM, tera tellence <[email protected]> wrote: > Dear All, > I was trying to see when the android package installer allows/rejects .apk. > My first attempt was to simply "hexedit" on a .apk and see what happens > during : > adb install xxx.apk > I get this error: INSTALL_PARSE_FAILED_NO_CERTIFICATES > which surprises me. I thought it would fail at the verification of JAR.. > So I would like somebody throw light on the whole process: > A JAR file of the .apk(the App) creates an archive file which is then signed > with the private key of the creator of JAR and the signature of the JAR is > verified with the public key. > The certificate is a statement from the owner of the private key that the > public key in the pair has a particular value so the person using the public > key can be assured the public key is authentic. > How is changing a hex value on the apk ( I would assume as manipulating the > apk, and therefore would not be verified well) giving such an error as > above? > > Thanks in advance > > -- > You received this message because you are subscribed to the Google Groups > "Android Security Discussions" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/android-security-discuss?hl=en. > -- You received this message because you are subscribed to the Google Groups "Android Security Discussions" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/android-security-discuss?hl=en.
