Description of files found in .../NetBSD-1.3.1/i386/binary/security:

This directory contains the gzip compressed tar file of the binary
distribution of the security software.  It is named "secr.tgz".  The
contents of this file is described fully in the INSTALL document.

Please read README.export-control before downloading this software. To
summarize, it is against United States law to export cryptographic
software without the express permission of the U.S. Government.

The Split/ directory contains a split version of this file.  These are
provided to permit installation from floppy disks for those with no
other means of installation.  See INSTALL for details. Note that this
method of installation is extremely laborious and not recommended if
any other alternative exists.

Every directory contains several checksum files (BSDSUM, CKSUM, MD5, &
SYSVSUM) that contain checksums of all the other files made with the
cksum(1) utility. The MD5 checksums made with "cksum -m" are
considered the "safest", followed by the CKSUM POSIX-style checksums
made with the plain "cksum" command. Please check the integrity of
your distribution against one of these sets of checksums if
possible. The BSDSUM and SYSVSUM files contain checksums made with the
historical BSD and System V checksum utilities and are provided for
those with no other checksum utilities available.