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RedHat 9 (Linux i386) - man page for v4rcp (redhat section 1)

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RCP(1)											   RCP(1)

       v4rcp - back end for Kerberos V4 rcp

       v4rcp not invoked by users

       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

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

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