Stephan,
This has given some long discussion about it, especially with sensitive passwords.
Last one of them is here :
Kix encryption

Here are the actual states :
For build-in internal support, actually there's nothing available. Kix can't encrypt and decrypt scripts.

For external possibility, i'll suggest you to have a look to Kixcrypt v2.06a

Beware, seems that there's a problem with 9x systems reported by awinkel, but nothing confirmed.

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? getobject(Kixtart.org.Signature)