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#! /usr/bin/env python

# -*- coding: utf-8 -*-

'''

20160605

栅栏加密算法简单实现

栅栏加密就是将明文按照顺序分成n组，然后将这n组，组合成一个密文。

如果字符数目不足，就要补以空格。

'''

s = raw_input("pl input a string:")#要求输入源串，并去掉两边空格

s.strip()

fence = input("pl input the fence number:")#分组数（大于2）

encodes = ''

len = len(s)

spacenum = len % fence

f = open("./t0605.txt", 'w+')  #打开存放结果的文件

for i in xrange(fence):

       j = i

       while j < len+spacenum:

              if j < len:

                     encodes += s[j]

              else:

                     encodes += ' '

              j += fence

print >>f, encodes

tn cjtfsiwal kes,hwitbn  g,npt  ttessfg}ua u  hmqik e {c,  n huiouosarwzmiibecesnren.

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#! /usr/bin/env python

# -*- coding: utf-8 -*-

'''

20160605

栅栏解密算法简单实现

栅栏解密相对加密要复杂些。在前面我们可以看到，加密是会产生一些空白，

而这些空白在生产密文是并没有记录，

所以这就造成了解密的复杂度。

这里要定义一些变量，以方便讲解：

Len密文长度

Column列数

Fence（row）分组数

但在实际解密时，fence不确定，所以column不确定，反之亦然。而文中可能本身含有空格（非加密产生的空格）所以不能用空格确定起始位置。

所以应该通过遍历len/2>fence>2的多种情况，观察文本是否可读，以此为判断解码是否成功的标准。

'''

s = raw_input("pl input a string:")#要求输入源串

len = len(s)

decodes = ''

f = open("./t0604.txt", 'w+')  #打开存放结果的文件

print >>f,'------OPEN Ur EYES-------'

for fence in xrange(2,len/2):

print >>f,'-----fence='+str(fence)+'------'

for i in range(fence):

decodes += s[i::fence]

print >>f,decodes

decodes = ''

------OPEN Ur EYES-------

-----fence=2------

t jfia e,wtn ,p tesgu  hqke{,  uooawmieene.nctswlkshib gnt tsf}au mi  c nhiusrzibcsrn

-----fence=3------

tcfw swb n ts}  q {  iormber.njsak,ingp efuuhiec hoswiese tileht ,ttsga mk ,nuuazicnn

-----fence=4------

tji ,t ptsu qe, oamen.ntwkhbgttfa i  huricr faewn, eg hk{ uowieecslsi n s}um cniszbsn

-----fence=5------

ttastg su kc uwbnnfl,b, sah ,hozer s hnntf me usmcecikw ptguq  iaienjwei te} i{noris.

-----fence=6------

tf w  s q{ ome.nskig fuichsis iet,tg k,uaincwsbnt}   irbrja,npeuhe oweetlh tsam nuzcn

-----fence=7------

tsebps i,iwc.nisntsuk oze w,  f   umscah  g enoinjlwgt}h  sirt i,tum{habefktneaqcuren

-----fence=8------

ti, tuq,omnnwhgtai uir aw,e k oieclinsu nsbnj tps e ae.tkbtf  hrcfen gh{uwess  }mcizs

-----fence=9------

twwns {imrnaipfhcoie lttgm,uinc b }q ob.jkn ui sete taknacfs t   res,geuehwsih,s  uzn

-----fence=10------

tat uk wnnlb a hzr  nt eumeck tu iinje e {oi.tsgs cubf,,sh,oeshnfm sciwpgq aewit}inrs

-----fence=11------

tlnt cocn  e ,se k sh ascegsm rnjs,fqnwrt,ngi zefhp}khmnswtu ui.ii aeiiwt   obabtu{ue

-----fence=12------

t  sq m.nkgfihi e,gkuicsn} ibj,pueoethta ucfw  {oesi ucssitt ,anwbt  rraneh wel smnzn

-----fence=13------

tk,}euenenu os spa{snc,t carjh u,retw   wnfit  z.stthnmibem iwnsqhia siubl fkie gg oc

-----fence=14------

tep ,w.nstu z ,   mch  nijwth ititmhbftequesbsiicinskoew f usa geonlg} sr ,u{aeknacrn

-----fence=15------

ts   bn, hhe htmuccwtqiejieiosttskunfbs orsnfesei g anw }{r.agucwl,a,z n  mkpu iet ni

-----fence=16------

t,tqonnhtiur wekoecis snjtsea.tbf rfng{ws }czi u,mwga ia,  ilnunb p  ekt hce hues mis

-----fence=17------

the anwser is wctf{zjbgcmtn},if u is a big new,u can help us think more question,tks.

-----fence=18------

tws{mnifci tg,icb} bjnu et ancf   esguhsi, unwn iraphoeltmun  qo.k isetkast r,eewhs z

-----fence=19------

tig ent} c bunecna sj  hnt uurfg ies, oninhu.wpmoatqsl ia  krkt wetezse m,s{ihsciwf,b

-----fence=20------

ttu nnbahr n uec uinj  o.tg uf,hosnmsipqawtira kwl  z temkt iee{isscb,s,ehf cwg ei}ns

-----fence=21------

tb i.nnuo   uc  ojghst,mafnqrspiwitkzw  ma eilt i t{bkecees,css e,f shgnnw} riuhetaun

-----fence=22------

tn on  s  hacgmrj,qwtnizfpkmst ii eiw  bat{eltcc e,eks ses nsfnr,g eh}hnwuu.iait obuu

-----fence=23------

t hrn mw gqzc,imjnkitp iftebs  ei {cwtceat,sle n s rksneef nsgh.,}uhuiwaoi utuob sn a

-----fence=24------

t qmngii ,kicn bjpeett cf {es csit,nwt rae elsnn s .kfhegus}i,uohauw oiust ab rnhw mz

-----fence=25------

tgkbn, e neccp ejt{st cnf ,rst eit nwen.as lsh fukgie}osuu,aoh swuai rt wbhznmm qi ii

-----fence=26------

t,eenn s p{nctcrj ,et  nft .stnie wshasulfi gok}ueuosas, ahurw wi zthmbminqi ib keg c

-----fence=27------

tn{rnpce t,nc  .j  ttnft sehisuwsiafolgu }okuseaas r,uwh zw mihitmibqbnie kc  eges, n

-----fence=28------

tp,.nt    c njt tthfeussiisowfuagol}s uakare wsuz, mh iwhiimbtqebicnke  s eng r,{encn

-----fence=29------

tt n n   cthjtuteifsossuifowgsa}alur awk zeums i, ihhbwmeiqctiebksn n er  eg{n,c.n,p

-----fence=30------

t  n h tuctijeotsufsosfsigaw}rauwlaz  mkuie is b,hehmcwqeiistknb rnee  n {.gc,,n p tn

-----fence=31------

t unti toceujsotssffasgri}wwuzaaml i uik be eshc,mehqswinikrt ebenn . { cg,, n pnt  h

-----fence=32------

ttontu eocssjsatfrfgws}ziumwaia ilub  ek cehesms,qnhirwkei nte.b n{ c ,g , nnp th u i

-----fence=33------

ttones sacsrjfwtgzf}msuiiaiw bauel c  ekhsemnsqr,iehknw .iet b{nc ,  g ,nn phtu i otu

-----fence=34------

teansr swcfzjgmt}ifuisabi ewuca el s hnkmreqesin,k.h wei t{bcn,    gn, nhputi o utots

-----fence=35------

tswnsz fmcgij}itubfaes ciuew sa nlhr mekqnei.sk, hew i{tcb,n    ng ,hnupito u otstaer

-----fence=36------

tsmnfi gic}bjuetacf esusi nw rahelmn q.kieks ,eh w{ict,b n  n  gh,unipotu o statrewsz

-----fence=37------

tfingb }ecucjaet sfuns ri ewhnam.lq ikke se, h{wci,t b nn   hgu,inoputo s atrtwezsmsi

-----fence=38------

tgen}c uecasj nturf es nih.wmaqli kk ees ,{hcw,i t bnn  h ugi,onupots a rtwtzemsisifb

-----fence=39------

t}enus anc rjuet nf .shimwqailk  kee s{,ch,w i tnb nh u igo,unopsta r wtztmeisisbfegc

-----fence=40------

tunnar  ecunj .t fhsmiqwiakl  ek e{sc,,h w int bhnu i ogu,onspatr w ztmtieisbsefcge}s

-----fence=41------

taen n u.c j thfmsqiiwka le  k{ecs,, h wni thbuni o ugo,snaprtw z mtitiebsescfegs}nur