Actually the instructions state you should use 25+ years for a single 
application; more if you sign multiple applications (there's a 20 year 
minimum for app on Google Play)
If you encounter this issue in 25 years, post it on their 
future-holodeck-message-board :-)  I think the idea behind this is that 99% 
of apps would not last this long or at least would not last as the same 
code base.



On Tuesday, July 23, 2013 3:07:06 AM UTC+3, Raymond Rodgers wrote:
>
>  On 07/22/2013 12:08 AM, Ted Hopp wrote:
>
> On Thursday, June 14, 2012 12:43:51 PM UTC-4, Dianne Hackborn wrote:
>
>>  The platform has an app signed with a cert.  If you want to install an 
>> update to that app under a different cert, how could the platform trust 
>> that this is actually coming from the author who owns the original cert 
>> without the new app also being signed in some way with the original cert? 
>>  Note that we don't use certificate authorities, so there is no root cert 
>> or such to go back to, to try to verify some relationship between two 
>> certs.  Because we use self-signing, you are ultimately the CA, and have 
>> responsibility for the certs you generate.
>>  
>
>  I know this is an old thread, but this caught my attention. Would it not 
> be possible to come up with a tool with which a developer could somehow use 
> the old cert as the authority for the new one? After all, the developer is 
> the only one with access to the private key, so a new cert could be 
> "signed" by the old one just as an .apk file is signed.
>
>  I've been wondering about this issue a bit for a while now though it was 
> never really at a high importance level. Although it's been a while since I 
> created my keystore, I believe that the instructions we were given 
> originally said to make the key valid for 10 years. What are developers 
> supposed to do when that 10 year mark is up? For instance, what if my app 
> has been receiving regular updates for that entire 10 year period, and at 
> the 10 years and 1 day mark, I need to update it again. The key has 
> expired, so I can't technically update the application in the Play Store. 
> Is there a way to regenerate the key or extend the expiration date? If not, 
> is there a plan? Android has a ways to go before the ten year anniversary, 
> but I hope there's a plan in place for dealing with this [possible] issue.
>
> -- 
> Raymond Rodgershttp://www.badlucksoft.com/http://anevilgeni.us/
>
>  

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