[R-SIG-Mac] invalid digital signature for R-3.1.0-mavericks

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon May 12 18:35:43 CEST 2014

Two possibilities from 

1) Your security settings might allow only downloads from the App Store 
(look at System Preferences | Security & Privacy | General).

2) Your certificate chain is broken.

Also, check your OS is fully updated: some googling shows Apple updates 
as a cause for similar problems.

On 12/05/2014 13:48, Paul Cantalupo wrote:
> Hello,
> I'm trying to upgrade R from 3.0.3 to 3.1 on MacBookPro Mavericks 10.9.2.
> After downloading R-3.1.0-mavericks.pkg from http://cran.stat.ucla.edu/ and
> clicking it, I get the following error message:
> "R-3.1.0-mavericks.pkg can't be installed because its digital signature is
> invalid".
> I checked the md5 signature with md5sum and it matches that found on the

Again: that is not a signature: it is a 'hash' or 'checksum' or 'digest'.

> download page. I also tried re-downloading the package from different
> mirror sites and I get the same error. I also tried R-3.1.0-snowleopard.pkg
> but I got the following error:
> "This package was signed with an invalid certificate. This package might
> not install what you expect."
> But unlike the mavericks.pkg, the snowleopard.pkg provides me the option to
> continue the install in spite of the warning.
> Why am I getting these 'invalid' warnings? How do I securely and properly
> install R 3.1 on my Mac that is running Mavericks? It is strange that just
> a few weeks ago, I did not have these problems installing R 3.0.3.
> Thank you for your help,
> Paul
> P.S. I originally posted this email here
> https://stat.ethz.ch/pipermail/r-help/2014-May/374522.html
> 	[[alternative HTML version deleted]]
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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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