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-codeigniter-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 07:41:54 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 0d8541f2b68c0281c05d43c8af46e970cf0c994a * md5sum 84be7db6b1c18d791fa4c5fb7e5eeb9e 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) iQEcBAABAgAGBQJSMsG6AAoJEIXCXpWhbrlNBV0H/1IB3iVE7S6WgHrGlHxYpIVO 6wHyxgB3wDUHEGrZFXh5UVfgtDIickRhk2EG8IyVWN/IwJW2EyC+Bwbjf6FgXxPS YjtvOCoumfXtXmwcl65oCmh0PXryQCu/V1RvLDF6gSO3/5IZTWRrpqhRCktOD4ft wt+pBOLY/sF0xxhFf6VPLiT/G0yfvHq/wI0XmSd7/QFE8ZVPgRCTmK/p4I4vLlNF lrShoh8/Csij1INPsDBjuFPx5VgaRPbgubn4MG8n3tOP5LJXt/3ColPK0Pqa5WLp Woyez2eefTPuZI9GFanPXZ4S/KeYMDzzCvYkXj4tNhfsNPckjCbmFdDBzPOc56Y= =DHFR -----END PGP SIGNATURE-----