configuring the master slapd for replication / credentials question.

[Jatin Nansi <jatin.nansi@timesgroup.com>]

Hi,

from the ldap administrators guide:

Section: 10.4.5. Configure the master slapd for replication

example:
 replica host=slave.example.com:389
                binddn="cn=Replicator,dc=example,dc=com"
                bindmethod=simple credentials=secret

the guide also notes: 
Note: The use of strong authentication and transport security is 
highly recommended. 

what i want to know is can i cypt the credentials provided,
so it is not in text format (since that makes the slave very vernerable).
and what is meant by strong authentication? SASL / Kerberos?
If so how is that to be configured into slapd.conf?

Could any1 kindly provide examples?

Thank you,

Jatin