john为什么会有这样的信息？

[i=s] 本帖最后由 LINUX_COM 于 2010-1-7 14:32 编辑 [/i]

一。pw.txt：字典文件。
字典文件内容：
v?!=T&M#'#]B#5y,4X@+>P.,$IurSg:{3=+}%NdFE:POw\G|eS(baWH==67}Q`+TtS#+Xyj_hGZ}pj0fT^sgc8O`enAo/`|92BXP/A#s]p`;%AtyDe*O^gn|:~Q=':L?K/z'A_?s+!@p/jsSnz%1f[onS9wi]Q!Y;7'?>&!WHI"Czn|?hA`1>(2AefhJ}v73j&~#mCmZ;70sA`5`ZT&rbO=('.}$"Zbc?,n4.qRG%6tiJ5zCF2i/yQ_;u5k*?Pl{X8~[P.MS@V{19olf}g{D0D#a1QNNalI<$iJ91+mU&+Tu.xVrctTi"PTt?3hf}MaZv'sIo]{2FXF


二。shadow.txt:系统的 shadow文件另存为.txt文件。
shadow.txt文件内容：
root:!:14588:0:99999:7:::
daemon:*:14545:0:99999:7:::
bin:*:14545:0:99999:7:::
sys:*:14545:0:99999:7:::
sync:*:14545:0:99999:7:::
games:*:14545:0:99999:7:::
man:*:14545:0:99999:7:::
lp:*:14545:0:99999:7:::
mail:*:14545:0:99999:7:::
news:*:14545:0:99999:7:::
uucp:*:14545:0:99999:7:::
proxy:*:14545:0:99999:7:::
www-data:*:14545:0:99999:7:::
backup:*:14545:0:99999:7:::
list:*:14545:0:99999:7:::
irc:*:14545:0:99999:7:::
gnats:*:14545:0:99999:7:::
nobody:*:14545:0:99999:7:::
libuuid:!:14545:0:99999:7:::
syslog:*:14545:0:99999:7:::
messagebus:*:14545:0:99999:7:::
hplip:*:14545:0:99999:7:::
avahi-autoipd:*:14545:0:99999:7:::
avahi:*:14545:0:99999:7:::
couchdb:*:14545:0:99999:7:::
haldaemon:*:14545:0:99999:7:::
speech-dispatcher:!:14545:0:99999:7:::
kernoops:*:14545:0:99999:7:::
saned:*:14545:0:99999:7:::
pulse:*:14545:0:99999:7:::
gdm:*:14545:0:99999:7:::
t:$6$HjXo/1.o$WM1zYbSoYuro8w6wDGpVd7XYJpTYQHNAdgGWweWKK59fBPDxxJPwygquwio1:14590:0:99999:7:::

其中用户：t，是有密码的！为什么有这样的信息？