Environment variable values encrption in profile

Hello
This is the format of present profile which we use for a AIX user
export DMRUNuser ; DMRUNuser="owbrunuser_10"
export DMRUNpasswd ; DMRUNpasswd="ods$12345"

DMRUNuser&DMRUNpasswd were the environmental users which store the user id and password of a oracle user.
Can any one help us in encrypting these hardcoded values at profile level.

Thanks & Regards

can any one help us in this front