App signing attaches a cryptographic signature to a build so the platform can confirm who published it and that it has not changed since. Android and iOS both require apps to be signed, and they use the signature to decide whether an update really comes from the same developer.
The signing key is sensitive. If it leaks, someone could publish a build that looks like yours. Keeping signing keys protected, and checking signature details during review, are part of mobile app security.
Mobexa tests the exact Android or iOS build you ship and maps every finding to the OWASP Mobile Top 10 and MASVS.
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