NMAP packaged is not signed...???

[jojojo]

I've tried to install nmap, but a slight problem:

[root@localhost NMAP]# yum install nmap*
Loading "fastestmirror" plugin
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
dries                                                                [1/6]
dries                     100% |=========================|  951 B    00:00
livna                                                                [2/6]
livna                     100% |=========================|  951 B    00:00
updates                                                              [3/6]
updates                   100% |=========================|  951 B    00:00
core                                                                 [4/6]
core                      100% |=========================| 1.1 kB    00:00
macromedia                                                           [5/6]
macromedia                100% |=========================|  951 B    00:00
extras                                                               [6/6]
extras                    100% |=========================| 1.1 kB    00:00
Determining fastest mirrors
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 377 kB    00:09
updates   : ################################################## 1164/1164
Added 30 new packages, deleted 7 old in 6.77 seconds
primary.xml.gz            100% |=========================| 1.2 MB    00:37
http://mirror.pacific.net.au/linux/fedora/linux/extras/5/i386/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.xml.gz            100% |=========================| 787 kB    01:04
extras    : ################################################## 2235/2235
Added 397 new packages, deleted 1719 old in 19.09 seconds
Parsing package install arguments
Examining nmap-3.55-1.i386.rpm: nmap - 2:3.55-1.i386
Marking nmap-3.55-1.i386.rpm to be installed
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package nmap.i386 2:3.55-1 set to be updated
--> Running transaction check
--> Processing Dependency: libstdc++-libc6.2-2.so.3 for package: nmap
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for compat-libstdc++-296 to pack into transaction set.
compat-libstdc%2B%2B-296- 100% |=========================| 3.4 kB    00:00
---> Package compat-libstdc++-296.i386 0:2.96-135 set to be updated
--> Running transaction check

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 nmap                    i386       2:3.55-1         nmap-3.55-1.i386.rpm  1.7 M
Installing for dependencies:
 compat-libstdc++-296    i386       2.96-135         core              175 k

Transaction Summary
=============================================================================
Install      2 Package(s)
Update       0 Package(s)
Remove       0 Package(s)
Total download size: 1.8 M
Is this ok [y/N]: y
Downloading Packages:
(1/1): compat-libstdc++-2 100% |=========================| 175 kB    00:06


Package nmap-3.55-1.i386.rpm is not signed

What does "Package nmap-3.55-1.i386.rpm is not signed". What's the problem? Is it already installed? If so, how to run the nmap?

[LinuxBox420]

As root run...

nmap -sS -p- localhost

to see.

Read the man pages for more on nmap. There's also a frontend for it. As root run nmapfe instead.