Signed checksums for pdfs

[erciccione]

Issue originally created by @Koe

This issue was created on gitlab and then migrated here. Only the original post was migrated, not the comments. Please take a look at the discussions on the original Gitlab issue before commenting here: https://repo.getmonero.org/monero-project/monero-site/-/issues/1081

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Following this comment on ztm2, it seems wise to add a signed checksum for all pdf documents hosted on the site (and other non-software downloads). This includes all the MRL files, and everything in the library. There are also some .ai files in the Press Kit.

Given the amount of files (about 18), I think it would be helpful to have a separate page for all of them.

[garlicgambit]

Having (unsigned) sha256sums available on the website and in the wild would be a start. Lets make it a habit to post checksums of files.

[erciccione]

This is not planned.