Installing Error: is unknown trust

Question

[root@Acid zach]# pacman -Syu
:: Synchronizing package databases...
core is up to date
extra is up to date
community is up to date
arch-fonts is up to date
:: Starting full system upgrade...
resolving dependencies...
looking for inter-conflicts...
Targets (11): cifs-utils-5.2-1  gpgme-1.3.1-2  inetutils-1.9.1-1  libass-0.10.0-3  libcap-ng-0.6.6-1  linux-3.2.1-1  nvidia-290.10-2
              openssl-1.0.0.g-1  perl-5.14.2-7  sdl_image-1.2.11-1  xkeyboard-config-2.4.1-3
Total Installed Size:   127.48 MiB                                                                                                             
Net Upgrade Size:       7.03 MiB                                                                                                               
Proceed with installation? [Y/n] y                                                                                                             
(11/11) checking package integrity                                                    [##################################################] 100%
error: libcap-ng: signature from "Ionut Biru <[email protected]>" is unknown trust                                                           
error: cifs-utils: signature from "Tobias Powalowski <[email protected]>" is unknown trust                                     
error: gpgme: signature from "Dave Reisner <[email protected]>" is unknown trust                                                               
error: inetutils: signature from "Eric Belanger <[email protected]>" is unknown trust                                                         
error: libass: signature from "Giovanni Scafora <[email protected]>" is unknown trust                                                     
error: linux: signature from "Tobias Powalowski <[email protected]>" is unknown trust                                           
error: nvidia: signature from "Tobias Powalowski <[email protected]>" is unknown trust                                         
error: perl: signature from "Florian Pritz <[email protected]>" is unknown trust                                                               
error: openssl: key "7F2D434B9741E8AC" is unknown                                                                                             
error: key "7F2D434B9741E8AC" could not be looked up remotely                                                                                 
error: sdl_image: key "A5E9288C4FA415FA" is unknown                                                                                           
error: key "A5E9288C4FA415FA" could not be looked up remotely                                                                                 
error: xkeyboard-config: signature from "Florian Pritz <[email protected]>" is unknown trust                                                   
error: failed to commit transaction (invalid or corrupted package (PGP signature))                                                             
Errors occurred, no packages were upgraded.
This happens when I do pacman -Syu
but not only pacman -Syu . when ever i want to install something.( but the error is from pacman -Syu)
just upgraded my pacman.
had to remove yaourt to upgrade it.
I must of done something wrong in between.
my best guess is that my pacman.conf hasnt changed to the new one. but i dont exactly
know how to do that safely.  I dont want to mess anything up . If you could help me that'd be great.
-Thanks

Answer 1

# /etc/pacman.conf
# See the pacman.conf(5) manpage for option and repository dire$
# GENERAL OPTIONS
[options]
# The following paths are commented out with their default valu$
# If you wish to use different paths, uncomment and update the $
#RootDir = /
#DBPath = /var/lib/pacman/
#CacheDir = /var/cache/pacman/pkg/
#LogFile = /var/log/pacman.log
HoldPkg = pacman glibc
# If upgrades are available for these packages they will be ask$
SyncFirst = pacman
#XferCommand = /usr/bin/wget --passive-ftp -c -O %o %u
#XferCommand = /usr/bin/curl -C - -f %u > %o
#CleanMethod = KeepInstalled
Architecture = auto
# Pacman won't upgrade packages listed in IgnorePkg and members$
#IgnorePkg =
#IgnoreGroup =
#NoUpgrade =
#NoExtract =
# Misc options (all disabled by default)
#UseSyslog
#ShowSize
#UseDelta
#TotalDownload
#CheckSpace
# REPOSITORIES
# - can be defined here or included from another file
# - pacman will search repositories in the order defined here
# - local/custom mirrors can be added here or in separate fil$
# - repositories listed first will take precedence when packa$
# have identical names, regardless of version number
# - URLs will have $repo replaced by the name of the current $
# - URLs will have $arch replaced by the name of the architec$