SPOJ signature - may be offtopic

[Hardeep Singh]

Hi

The Sphere online judge is signing the certificates like this:

http://www.spoj.pl/status/hardeeps/signedlist/

I am not able to understand if this is a simple hash of the contents,
or if this is a gpg-based sign (it doesnt look like correct format).
There is no public key on their site. Could anyone try and understand
what kind of signature this is, what hash function is used? Just
hashing the content doesnt prove anything - anybody could change both
the content and the hash.

Thanks & Regards
Hardeep Singh