How to secure web service using digital signature?

hi all, can you just tell me how to secure web service using digitally signin in?i need some specific imformation on this. i am new to web service. i now how to create web service using tomcat 5.0 server with eclipse.please tell me about this.thank you in
[299 byte] By [kevin_bhuvaa] at [2007-11-27 2:25:12]
# 1
Refer to https://wsit.dev.java.net or https://xwss.dev.java.net
venugr_suna at 2007-7-12 2:33:14 > top of Java-index,Enterprise & Remote Computing,Enterprise Technologies...