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<!doctype html><html lang="en"><head><title data-rh="true">Android App Signing —A Refresher. 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(-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/0*WhV_HVvRnfWaJCL3 640w, https://miro.medium.com/v2/resize:fit:720/0*WhV_HVvRnfWaJCL3 720w, https://miro.medium.com/v2/resize:fit:750/0*WhV_HVvRnfWaJCL3 750w, https://miro.medium.com/v2/resize:fit:786/0*WhV_HVvRnfWaJCL3 786w, https://miro.medium.com/v2/resize:fit:828/0*WhV_HVvRnfWaJCL3 828w, https://miro.medium.com/v2/resize:fit:1100/0*WhV_HVvRnfWaJCL3 1100w, https://miro.medium.com/v2/resize:fit:1400/0*WhV_HVvRnfWaJCL3 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh nd oj c" width="700" height="468" loading="lazy" role="presentation"/></picture></div></div><figcaption class="ok ff ol nw nx om on bf b bg z du">Photo by <a class="af oo" href="https://unsplash.com/@homajob?utm_source=medium&utm_medium=referral" rel="noopener ugc nofollow" target="_blank">Scott Graham</a> on <a class="af oo" href="https://unsplash.com/?utm_source=medium&utm_medium=referral" rel="noopener ugc nofollow" target="_blank">Unsplash</a></figcaption></figure><p id="6559" class="pw-post-body-paragraph op oq hd or b ig os ot ou ij ov ow ox oy oz pa pb pc pd pe pf pg ph pi pj pk gw bk pl"><span class="l pm pn po bo pp pq pr ps pt fj">O</span>ne of the crucial bits of Android development is setting up “signing the App” and publishing it to the Play Store. It’s usually a one-off process for each app published. Hence it’s a step not only can be easily forgotten, but also the knowledge one can become dated.</p><p id="a327" class="pw-post-body-paragraph op oq hd or b ig os ot ou ij ov ow ox oy oz pa pb pc pd pe pf pg ph pi pj pk gw bk">The last time I published an app was years ago. It was during the time when we just signed the app locally before passing publishing it in Google PlayStore (as per the image below), which has changed so much today.</p><figure class="nz oa ob oc od oe nw nx paragraph-image"><div class="nw nx pu"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 1100w, https://miro.medium.com/v2/resize:fit:1374/format:webp/1*OrGK7vU5w6QOdCl_sJQ6mw.png 1374w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 687px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*OrGK7vU5w6QOdCl_sJQ6mw.png 640w, https://miro.medium.com/v2/resize:fit:720/1*OrGK7vU5w6QOdCl_sJQ6mw.png 720w, https://miro.medium.com/v2/resize:fit:750/1*OrGK7vU5w6QOdCl_sJQ6mw.png 750w, https://miro.medium.com/v2/resize:fit:786/1*OrGK7vU5w6QOdCl_sJQ6mw.png 786w, https://miro.medium.com/v2/resize:fit:828/1*OrGK7vU5w6QOdCl_sJQ6mw.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*OrGK7vU5w6QOdCl_sJQ6mw.png 1100w, https://miro.medium.com/v2/resize:fit:1374/1*OrGK7vU5w6QOdCl_sJQ6mw.png 1374w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 687px"/><img alt="" class="bh nd oj c" width="687" height="267" loading="lazy" role="presentation"/></picture></div><figcaption class="ok ff ol nw nx om on bf b bg z du">The original way of the Android App signing process</figcaption></figure><h2 id="4953" class="pv pw hd bf px py pz dy qa qb qc ea qd oy qe qf qg pc qh qi qj pg qk ql qm hj bk">Google taking over the App Signing</h2><p id="2376" class="pw-post-body-paragraph op oq hd or b ig qn ot ou ij qo ow ox oy qp pa pb pc qq pe pf pg qr pi pj pk gw bk">In the old process, there were some risks.</p><p id="0b3c" class="pw-post-body-paragraph op oq hd or b ig os ot ou ij ov ow ox oy oz pa pb pc pd pe pf pg ph pi pj pk gw bk">Given the signing key is all locally stored, Google has no knowledge of the key. Google claimed the following issues arises</p><ul class=""><li id="5338" class="op oq hd or b ig os ot ou ij ov ow ox oy oz pa pb pc pd pe pf pg ph pi pj pk qs qt qu bk">When a developer lost the local Signing Key, or it has been compromised, Google…</li></ul></div></div></div></div></section></div></div></article></div><div class="l"></div><footer class="qv qw qx qy gv ab q qz jk c"><div class="l ae"><div class="ab cb"><div class="ci bh fz ga gb gc"><div class="ab cp ra"><div class="ab q lu"><div class="rb l"><span class="l rc rd re e d"><div class="ab q lu lv"><div class="pw-multi-vote-icon fj gt lw lx ly"><span><a class="af ag ah ai aj ak al am an ao ap aq ar as at" data-testid="footerClapButton" rel="noopener follow" 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