Underneath the curl|bash method, which is what is being discussed I believe, there is a link to a "more secure installation.": https://rvm.io/rvm/security https

Underneath the curl|bash method, which is what is being discussed I believe, there is a link to a "more secure installation.": https://rvm.io/rvm/security https://rvm.io/rvm/security . These instructions have you download and verify a signed installer.