Editing SETI@home (section)

===Unofficial clients===
A number of individuals and companies made unofficial changes to the distributed part of the software to try to produce faster results, but this compromised the integrity of all the results.<ref>{{cite journal | title = The SETI@Home Problem | journal = Crossroads |year = 2000 | first = David | last = Molnar | volume = 7 | issue = 1| url = http://oldwww.acm.org/crossroads/xrds7-1/september2000.html | archive-url = https://archive.today/20120715134754/http://oldwww.acm.org/crossroads/xrds7-1/september2000.html | archive-date = 15 July 2012 | access-date = 30 January 2011}}</ref> As a result, the software had to be updated to make it easier to detect such changes, and discover unreliable clients. BOINC will run on unofficial clients; however, clients that return different and therefore incorrect data are not allowed, so corrupting the result database is avoided. BOINC relies on cross-checking to validate data<ref>{{cite web |url=http://boinc.berkeley.edu/trac/wiki/SecurityIssues |title=SecurityIssues – BOINC – Trac |publisher=Boinc.berkeley.edu |access-date=17 May 2009 |archive-date=June 5, 2011 |archive-url=https://web.archive.org/web/20110605024001/http://boinc.berkeley.edu/trac/wiki/SecurityIssues |url-status=live }}</ref> but unreliable clients need to be identified, to avoid situations when two of these report the same invalid data and therefore corrupt the database. A very popular unofficial client (lunatic) allows users to take advantage of the special features provided by their processor(s) such as [[Streaming SIMD Extensions|SSE]], [[SSE2]], [[SSE3]], [[SSSE3]], [[SSE4]].1, and [[Advanced Vector Extensions|AVX]] to allow for faster processing.