you have to give local and remote pre-share-key to remote site. if this is a security concern why dont you use the certificate?
let say this is your config
ASA(config-tunnel-ipsec)# remote-authentication pre-shared-key 1234567890ASA(config-tunnel-ipsec)# local-authentication pre-shared-key 0987654321
now your remote site have config like this
ASA(config-tunnel-ipsec)# remote-authentication pre-shared-key 0987654321ASA(config-tunnel-ipsec)# local-authentication pre-shared-key 1234567890
please do not forget to rate.
