[CentOS] Hints on gpg key

I researched on google for some time ... 
This is my other machine having centos 3.4

Im getting these GPG_KEY error while using 

Yum install httpd-devel  AND Yum upgrade


warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY, key ID 025e513b
Error: Could not find the GPG Key necessary to validate pkg
/var/cache/yum/base/packages/httpd-devel-2.0.46-44.ent.centos.2.i386.rpm
Error: You may also check that you have the correct GPG keys installed

Thankx in advance
Any hints on this direction would be great

Vaneet


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