Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
Internet X.509 PKI - Time Stamp Protocols
The PKIX document describes a Time Stamp Authority (TSA) and a Temporal Data Authority (TDA), and the protocols to be used to communicate with them.