-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Two steps are required to cryptographically verify image integrity. 1. By verifying the integrity of this signature file, you can be sure that the checksums included in this file are valid. $ gpg --keyserver hkp://pool.sks-keyservers.net --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-icescrum-14.1-jessie-amd64.iso.sig gpg: Good signature from "Turnkey Linux Release Key" 2. By calculating the image checksum and validating the hashed value is the same as listed below, you can be sure the image was not corrupted in transit or tampered with. $ md5sum turnkey-icescrum-14.1-jessie-amd64.iso 203f43eac8d44b41f1258fdd374a49b1 $ sha1sum turnkey-icescrum-14.1-jessie-amd64.iso a765c1590dfed0bb0620114245a8b478966cf0f5 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPyAAoJEIXCXpWhbrlNtcoH/ArW3rjBVj5ZPyy+sZ3x+A8D N8C2v8w1g61v3Ey3gLfr83n9JNguZYjsPYKCFjPSgBk2abAgt6gNJUC4p5YVfVF2 mw13qjWXFLds17oxzdogopEnQrYk0pEcOj62nwY28iXxKUTHEZqzF5+NC/72yePu oInu5mLbfq87BAOAyb7+Xn9en7FH+74y3v1Ns+hpFsJ+2GHPVTMWiCFd5Ng0Yorh /JBVIydJJGlDImBM6FJL20ktNE6Z7q8/6WVL32pnCh/VWvuqtfrWIgPErvOmsr0g 6+hYUCR32uV75OWD26v02aq34DHi5sc9I5aUpPWZts1TAIhXN/ou3pOrYZC9YLw= =Ulkk -----END PGP SIGNATURE-----