I recently downloaded Debian 7.5.0 Wheezy and managed to use the Release.sig signature to verify the integrity of the Release checksum file using GPG4Win. Unfortunately, I couldn't find any advice on where to find the md5/SHA1/SHA256 checksum inside the Release file to verify that the ISO is correct/hasn't been corrupted/manipulated. Couldn't find any help regarding this specific problem on the support sites either. I am using Windows 7 if this is relevant.
Edit: The name of my ISO file is "debian-7.5.0-amd64-netinst". Other versions can be found here (ftp://cdimage.debian.org/cdimage/release/7.5.0-live/amd64/iso-hybrid/) and offer an easier way to verify the integrity because of this file: ftp://cdimage.debian.org/cdimage/release/7.5.0-live/amd64/iso-hybrid/SHA256SUMS. I need to find something like this in the Release file I verified.