When you download R, the same webpage should also provide the “md5 checksum” for the installation. Check the MD5 checksums of R before you begin the installation. Check the list of CRAN Mirrors for other HTTPS mirrors added since then.Ģ. The above list is complete as of August 12, 2015. If you are downloading R from CRAN, the following CRAN mirrors support HTTPS and we recommend using one of them: Check that the URL of the web page you are using to download R begins with “ ( not “ and that your browser reports the site to be secure. Always download R installers from a CRAN server using HTTPSĮvery time you download R, make sure you are connected to the download site using a secure HTTPS connection.
This document describes steps you can take to configure your existing or new R installations to adhere to best practices for secure R use.ġ. To eliminate the possibility of such an attack, the R Consortium recommends all R users to always download R and R packages using an encrypted HTTPS connection from a secure server. (This is possible, for example, when you download R using an unsecured Wi-Fi network.) This could potentially give an attacker the same rights you have to execute code on your system. If you download R (or R packages) using an unencrypted Internet connection, there is a possibility that a malicious actor could modify the code in transit (or substitute their own file), if they have access to the connection linking you and the CRAN server delivering the code.
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These recommendations are not unique to R: you should follow similar practices for any software you download from the Internet. The R Consortium was formed to serve the interests of the R user community, and to that end the members of the R Consortium would like to share some best practices for using R securely and safely.
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