apt-transport-https 1.0.9.7ubuntu2 (amd64 binary) in ubuntu vivid

 This package enables the usage of 'deb https://foo distro main' lines
 in the /etc/apt/sources.list so that all package managers using the
 libapt-pkg library can access metadata and packages available in sources
 accessible over https (Hypertext Transfer Protocol Secure).
 .
 This transport supports server as well as client authentication
 with certificates.