This signature file may be used to cryptographically verify file integrity, like this:: $ gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0xA16EB94D $ gpg --list-keys 0xA16EB94D pub 2048R/A16EB94D 2008-08-15 [expires: 2023-08-12] uid Turnkey Linux Release Key $ gpg --verify turnkey-appengine-python-13.0-wheezy-i386-xen.tar.bz2.sig gpg: Signature made Fri Nov 1 08:49:40 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum dae3d97e718bb01aee70344de1ed0fc403905a1d * md5sum 10890b0059cad0c8431c923b0a868217 You can calculate these on your end and compare to check for errors, but cryptographic verification is recommended for security reasons. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSc2scAAoJEIXCXpWhbrlNUd8H/2RFwjvmRi902/+wO0nM8rPT Q5HFCBV7S2tvpHBocZY5Va6MawF+R3AYs8GyWAe4KhN3kUWCjl4a483X/Khi9KsH sTUzLSKdXKVgX3XsMNrG3GGvbYn4ju8zPGg6sWyCbYjxljbF7AsMaPLJf4iP0E5h dBk0aq47GboMRFe39o4mExIaEF/FbWAzlnuKZsnU4ixzfpuyzXAGLFAE3IUWcdRU A7hjs3f5Ej5OWpUgWtTAHc4X3PKvATA5nnuPQohsKIiy5fO+tWF1xZ7L0IvJvgCL 4q/Ym2QFmjcvdKwQ6cd8yljmYjMjMPf5T4t9FjUhu0xYw5kZtvbMjmcg0QFq9Ro= =JCSq -----END PGP SIGNATURE-----