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 debian-7-turnkey-appengine-python_13.0-1_i386.ova.sig gpg: Signature made Tue Oct 15 15:03:03 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum ab6b506cdec13c3b7188bafb6dc72787e9b28961 * md5sum 97dfde5602e220e98cd638dccbd1baf8 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) iQEcBAABAgAGBQJSXVkfAAoJEIXCXpWhbrlNwhQH/joAV+x0E04o47ml9/0T5Di1 ZRVmZ8NkThcEwDTBNDh0A4UfOXRijPVaymIc5UtkNcPRLU2LRjbftD8APYTutVxq pQg/vczZ5MN2f+11MVPxBgarWNTIrKa/G2gDX5YKDbQmPQrrzdxX0hKwNLsWEe1l dgKqqbhDxS5H4YSo8P0zxu0+4ufH+Ijs/zhcDM78vIlvW/U5kxnQ9d2gIyNL7YEV VdrOoPGKiGUk3U7NCE0nPl+I7fxMNbZDFg5hwwMi0IWI/GXhV5R+fOQ9Q3dsvb54 2HBiaTjSrlbFz6QcBH2YVSs7UdKhNLDx2NiTcZ6DeGpTq8Lyor5sF/w1ZRF+Fvo= =AiZ8 -----END PGP SIGNATURE-----