You could use a public key encryption scheme. Crypt::RSA would seem like a good start. Another option might be persistent sessions, CGI::Session might be worth a look. Sorry for the vagueness of the answer, but there isn't enough information in the original post to be more specific.

2011-08-05 @ 1255Z Edited CGI::Session CPAN link

In reply to Re^3: A question about web service security by cjb
in thread A question about web service security by Anonymous Monk

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