connecting to postgresql using SSL without a certificate

Hello,

I wanted to ask if the sertificate at  ...\Application Data\postgresql 
directory is necessary to make a secure connection to the server? I was 
a bit surprised when after deleting the certificate and key files from 
...\Application Data\postgresql I was still capable of connecting to the 
server witch has hostssl entry for my computer address. The pgAdmin 
shows "Encryption SSL encripted " in server properties. What am I 
missing here?...

Client:
pgAdmin v 1.10.2 rev:8025
OS: WinXP + SP3

Server:
Postgresql 8.4.3
OS: Gentoo Linux

Thank you in advance.

-- 
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050