Hirschmann RS20 Reference Manual page 57

Security
– The device allows you to set the "Accept only encrypted requests"
function differently for the access with the read password and with the
read/write password.
– When logging in, the graphical user interface queries the current
setting of the device and sends encrypted queries if the device
requests this.
Figure 23: Dialog Password/SNMP Access
Note: If you do not know a password with "read/write" access, you will not
have write access to the device.
Note: For security reasons, the device does not display the passwords.
Make a note of every change. You cannot access the device without a valid
password.
Note: For security reasons, SNMPv3 encrypts the password. With the
"SNMPv1" or "SNMPv2" setting in the dialog Security:SNMPv1/v2
access, the device transfers the password unencrypted, so that this can
also be read.
RM GUI L2E
Release 8.0 05/2013
2.1 Password / SNMPv3 access
57