Counterpart to StringUtil.decString(encoded)?

what is the counterpart to method StringUtil.decString(encoded) from com.wm.pkg.art.util which is in WmART package?

I need to encrypt a password in my config file, so as to invoke the StringUtil.decString(encoded) method to decode it.

please advise.

public static java.lang.String encString(java.lang.String);

Regards,
Saravanan.E