how to encrypt password

hi,

i have a problem on how to hide the password.

everytime i type the password in the customize key entry on the selection screen for me to customize the table ZTFDIR and if i will open the table ZAUTHORITY it is where i insert the password and the user id. if will click the content of that table... the user id and the password will appear... so there is a possibility that some of the user will know the password i created for that selection screen.... how can i hide that password on the ZAUTHORITY TABLE???

I NEED IT ASAP...

BRYAN