redhat man page for v4rcp

RCP(1)							      General Commands Manual							    RCP(1)

NAME
       v4rcp - back end for Kerberos V4 rcp

SYNOPSIS
       v4rcp not invoked by users

DESCRIPTION
       This program is not for user execution. The usage message indicates this.

       Kerberos  Version  4  rsh  did  not support encryption. In order to perform encrypted file transfer, the version 4 rcp program did a second
       authentication, directly to the rcp process at the other end. This meant that rcp needed to be setuid to root in order  to  read  the  krb-
       srvtab file on the remote end.

       Rather  than add this complexity into the main Kerberos 5 rcp the Kerberos 5 kshd instead detects the use of Kerberos 4 authentication, and
       checks the command for the program name rcp and then substitutes the full pathname of v4rcp instead.  Since v4rcp is  installed	setuid	to
       root, it can perform the the authentication and get the session key needed to encrypt the file transfer.

       Kerberos 5 rcp instead uses the encryption support built in to Kerberos 5 rsh and kshd directly.

SEE ALSO
       rsh(1), rcp(1), kshd(8)

																	    RCP(1)