Kde equivalent to seahorse (gpg passphrase caching application) ?

Hello,

When using dpkg-buildpackage several times, I have to type my (long) gpg 
passphrase again and again.

I never found a Kde solution to cache my passphrase, but a gnome one is 
working perfectly, seahorse.

I just have to launch seahorse-agent, and when dpkg-buildpackage needs my 
passphrase, I give him it, and it cache it during a period.

I can't get the same result using something kde related, I tried to setup 
pinentry-qt, without success.

Someone knows a working kde solution ?

Thanks,
Loic