Windows Installer v.1.9.7.56 with PoSA3
C24922CD7F5D673C0E79577B076E443689E1C13547947FACF0C9272818E673BC
Linux Wallet v.1.9.7.56 with PoSA3
1D4DF85B2FB905765977E2C4834DB2F18B484F8A8DFF00F06AB7BACEDE2BAF35
Mac Wallet [will be updated]
3B6F3D5DA83FE3CCFA4E9977075204939ABFE77332831341F6D7F21570FD1151
is already on first page!
Those look like checksums and are better than nothing but doesn't prove they came from you. A verified checksum only proves I have downloaded a complete file.
A PGP signature would be a way to prove they came from you because of the PGP web of trust concept. It was only a suggestion as it takes security to the next level. Several of the major players in the digital currency space do this.