__[team] n19htch41n__


We have 3 files and the description is the same with desc.txt.

First,  we decode the description with Brainfuck deobfuscator, we have a equation:

> x^4-314x^3+2771x^2-7954x+7320=0

Solve it!!!

> x=2, x=3, x=4, x=305

Then, begin with the file1.txt, we have a hex file, just convert to strings

```
3hdhj2ino5cs711ip1jl8kl816gz0it3fzz6hzuo4lkk0as7xitwr3he6oopwsv7voci3i4tepb22sqltf0ed7814zahhag1cit4kd8zxfnyrz2okh07l4z6k87941pcjnemlnyq3rfp1qfbam6mi6h7a9x3b1m24to0jv66cuayb7jx0nvfwkhhwyz7m6fv99rplkile9ngdr0hv49xb74clrheoqowkd8a9sbgl5ia4k3bucrxax1ydxu6louv42iphyd01znbz004sgw8rgqu148se864xvwk9z2smvikys308v242njv8yg52o96sig0hf34q33dd157x5veulwbyvqrzf1hbywk8itwx14j0bdksigmx18ngi79gdgk1t65lqpyk9ngz3zxn6pa5j0ys7144cfqkew98s9nprasm3xfi6nkpliinklxgtgkj0ym1ecw0rfiph62futxqmfb9qseqpasg2bel91efisdtjftsrlutdtb9hkzx81lxa92s9g8fysczabqy3oal9iwq3c2761m1rwp41msqfk8tis1rhgwa31z6fe3yj4gmvsxlw1wrhyb1f7g5cf02syf8ji721d1pcu9yux8sdk3zukhobvs3axkuc9qfvgu34eq2wn5xbt6eha05tugff5v0aingolwz7170vxhvtscqbt5nu1pl8j18dtk77rlvpbsmoxi0v0ah1o1b8afamhs82n4x2vbdsoxmm36ps1cf34dqljgfsga2fozoefde36mtuvg9urd5fohu97hu1gu8xllcxta5zcqmkbz3ovpuv5f8oe2c09sfhk0w1yvlxdnh7ywra9lon125q7f5v9fyppfnun9j0zgtj7i9cmt5ykgsdbr9hil9f5b2ettg29quvb02da3xl5tvie5ky9kwb1bxu4bxku5j82j9upyenach78zq0b8htp3wmdf87yo6wmm1tpfoxbu4oa3js8mjnvu209rf0o64wek2135pvbobu378bjz0w3rq9umxfxtj2v69tjwkdux0n2wpzkgopzmgcdvvb6wv4y8g6f0u12xbwcepot5lm55sm2o5c5r5gb329xvauknvkq0udkvou9lv75jurxa64k208u93e68fk8n3q6qs66fofowfwqjidn11v3febxqu77jnj4923rnnkrvutcr625l8e5z330marrt5benok542p19qob6cxzasy8m3q4sx4wszzun956ucfwm1qqo62660dgqmo8t7y2gj3ylkgap7gr3gfwtkkeqhwenqrywpg8it6clj744c3lylkzqh89h55105izp3jz6jr2ft5e6d7abinisdedkt6i6fh77s57w96hgb86rbv43u4w8tymm29syjlem27c7hf4yabouq68s4zzb9hm9cla5i0ymf8rz3fctei4bofdolbriyhl9adl9eva393d7kla5blzqr7hmz3p1p80a9akvvduumov70xchc0jbctwq52ju8t6ieeuseqdroi3zkjw7pj6ivtjr2cei262gldr4abor694m5iubmhueyg2pxrjuj1h9tqfytc1uzk23aru3bmpgblo4l4l4kf5ivwcp67nhy9mgeisu571fult6wkuvlbywuzaheuxml7m4u1yjqw6g0u6xld1yzg5qisf7j5bz569kajvh6stlqmcs0la1wnri9sg9m3diu7br88wlsb6dg17z9zuw63ej54c24sxnduhirh7p4ltromy26ra3edsiiwj4gkkxa5zxrv7bploeskujv549q6g69eo8f0guopfr9h98xkeeoeow69x8gokutl8m0swoa2u4oq9a0okmtpl0c6j3rumsqyv7lr8dw1wf85th7uz8vjy1ovitw9woshu4tdhaa4ur3dpa79r7qttq2000z2rmacgj63bw5gdgnjj9tb3b7z72zu0hvbr61z0tw3upk7sn162r0wmqnifxr2tr7fd0mhyp79xvu64amxwvqes6e5wwa4phj1myw4yfcn7vfos13z3urmsyncggtkubs8ifriqb7frm6wajwu9wizpkfdrn6hob92322t63fi7on7xenllys6n76tx4e7mw880an07ij95g3ghyd8dbebcrfdkl1tb58owhta5qhzwekxqmn3tok8sv83kumztyamkeph0lw0cvvs6yamxynngy4vr3j7582m614tep2lfahgoubzzos3rloyedlbfy00x0n38jziysdkdgji1uxzyhnst931dqgz7w6d9g1wyia0rki1zzit58soj5vbx5xrbwwvw0ek0c6y8gujx3xvajjqcsl5t7sesjfb0tr8p7flp8fzpokzl42s0b86gh6ggnsymguzeeivwzhjz096wj3p8kl46izj35d2w4hlbx5fkleltl2ghdttx4698blgd4wbux04svz1e9649dzhja2s01kyl5opmy1wxsiypv1lc64s6oeee6e41s1enbijtbj19funhpmsmzsqpzpkqplimuycuhsz6ljdvhk3e3o6ml7ezckw2x4ry4pyxqw4lji1agq0wj7n7a1xwz78erzz831jciq866su6puq5h9omsf7oa8l18ix7l4lw6iry2o612lkgd83meqlun3rd6wej821e8noktby8nhoy6e97jkcv52haiahe4tpdzh0pprnjwm203yumiadjzwvvrkqyxdzyx9pnook6s9xwf0fjiwxsjff6w0fgpdhv5glqd2ienn1h475i45df8j8wja8jpotloji3mdwdt8m8qmtyjxzrcmcxkvw2negz1hda7j2xb6u3vhhnq2xt89clygemmj1eosg6n6px360hngiq94sk6xqz1hr02lpombgrh84be0w5zr3sgv4n6wo7d59tddl6ycwk19c7r5ebqc71z1p00odk34dsyah3bb96npl05d6yhdicz8yv4eaauu1j4h57ia8yvm5r1drxz5zfbpx81zys2l9babdz4w6mopvthslhffjxjhj7wor7dyxxstn62gb4rellqyv3890c7uutqhj9yuwgxr6l9mcvqe2wd74fue5pp0e5dnzo0s70lknmuy0qmpg1o1rus1kybfu5vcwax7omsm6xk621ddwfn9tatwbc1slsgh7139ufgnjwdbx9acqewaf2lkdglakng82etn9xfupzvo9fvvibt28m8am0iiwdoyvs2fkypcdose7a3gs2kwkd4ua1wjf
```
Continue with file2


x = 0, y =0, rule = B3/S23 ? We Google it and found some interesting results :
[RLE file format](http://golly.sourceforge.net/Help/formats.html),
[Conway's Game of Life](http://www.conwaylife.com/wiki/Run_Length_Encoded).
Okay, we tried with all part with "!" present.
With a final part, import to
[this](http://copy.sh/life/)
, we get a result
```
x = 0, y = 0, rule = B3/S23
10$obo5b3obob3obob
ob$obob3obo7bobobobobob3o$bo2b3ob3obo2bo2b3ob3o$bo2b3obo3bobo3b3ob3ob3o
$bo2bobobo3bob3obobob3o$!
```

>"YmFiZWw= "  (base64)  -> babel

Okay, Google again. The name of challenge "Jorge Luis Borges", "book", "babel". And then, we get the book with a website
> https://libraryofbabel.info


hex name: strings from file1

wall : 2

shelf : 3

volume: 4

page: 305


flag: d4rk{daymsonureadbooksbiglol}c0de

Thanks to @wensu, my teammate copporarting with me to solve this challenge.