[Day 23] Crypto 小生活

我们依旧继续解题
Crypto
Binary我不敢解,我俗辣

la cifra de (200 points)

la cifra de 是法文
I found this cipher in an old book. Can you figure out what it says?
Connect with nc jupiter.challenges.picoctf.org 32411.

Hints
1.There are tools that make this easy.
2.Perhaps looking at history will help

看到nc jupiter.challenges.picoctf.org 32411.
大家都知道怎麽做吧
昨天有用到,上周也有使用过

root@kali:/media/sf_CTFs/pico/la_cifra_de# nc 2019shell1.picoctf.com 32411
Encrypted message:
 Ne iy nytkwpsznyg nth it mtsztcy vjzprj zfzjy rkhpibj nrkitt ltc tnnygy ysee itd tte cxjltk

Ifrosr tnj noawde uk siyyzre, yse Bnretèwp Cousex mls hjpn xjtnbjytki xatd eisjd

Iz bls lfwskqj azycihzeej yz Brftsk ip Volpnèxj ls oy hay tcimnyarqj dkxnrogpd os 1553 my Mnzvgs Mazytszf Merqlsu ny hox moup Wa inqrg ipl. Ynr. Gotgat Gltzndtg Gplrfdo

Ltc tnj tmvqpmkseaznzn uk ehox nivmpr g ylbrj ts ltcmki my yqtdosr tnj wocjc hgqq ol fy oxitngwj arusahje fuw ln guaaxjytrd catizm tzxbkw zf vqlckx hizm ceyupcz yz tnj fpvjc hgqqpohzCZK{m311a50_0x_a1rn3x3_h1ah3xj62p044a}

Zmp fowdt cjwl-jtnusjytki oeyhcivytot tq a vtwygqahggptoh nivmpr nthebjc, wgx xajj lruzyd 1467 hd Weus Mazytszf Llhjcto.

Yse Bnretèwp Cousex nd tnjceltce ytxeznxey hllrjo tnj Llhjcto Itsi tc Argprzn Nivmpr.

Os 1508, Uonfynkx Eroysesnfs osgetypd zmp su-hllrjo tggflg wpczf (l mgycid tq snnqtki llvmlbkyd) tnfe wuzwd rfeex gp a iwttohll itxpuspnz tq tnj Gimjyèrk Htpnjc.

Bkqwayt’d skhznj gzoqqpt guaegwpd os 1555 ls g hznznyugytot tq tnj qixxe. Tnj wocjc hgqgey tq tnj llvmlbkyd axj yoc xsilypd xjrurfcle, gft zmp arusahjes gso tnj tnjji lkyeexx lrk rtxki my sjlny tq a sspmustc qjj pnwlsk, bsiim nat gp dokqexjyt cneh kfnh itcrkxaotipnz.

一坨奇怪诡异的密码,推荐大家这个好工具
这工具专门在不知道 key 时破解维吉尼亚密码

 It is interesting how in history people often receive credit for things they did not create

During the course of history, the Vigenère Cipher has been reinvented many times

It was falsely attributed to Blaise de Vigenère as it was originally described in 1553 by Giovan Battista Bellaso in his book La cifra del. Sig. Giovan Battista Bellaso

For the implementation of this cipher a table is formed by sliding the lower half of an ordinary alphabet for an apparently random number of places with respect to the upper halfpicoCTF{b311a50_0r_v1gn3r3_c1ph3re62e044a}

The first well-documented description of a polyalphabetic cipher however, was made around 1467 by Leon Battista Alberti.

The Vigenère Cipher is therefore sometimes called the Alberti Disc or Alberti Cipher.

In 1508, Johannes Trithemius invented the so-called tabula recta (a matrix of shifted alphabets) that would later be a critical component of the Vigenère Cipher.

Bellaso’s second booklet appeared in 1555 as a continuation of the first. The lower halves of the alphabets are now shifted regularly, but the alphabets and the index letters are mixed by means of a mnemonic key phrase, which can be different with each correspondent.

The flag: picoCTF{b311a50_0r_v1gn3r3_c1ph3re62e044a}.

Key "flag"
Key length 4
Cipher text length 952
Ratio
(cipher_len:key_len) 238.00
Difficulty
easy
Clear text score (fitness)
99.57

原谅我今天脖子很不舒服,
只想解一题明早要去针灸
想分享我的歌单比较特别
以情绪来区分的
不是曲风
我有难过,厌世,愤怒,快乐,
热血,友情,亲情,梦想,离别歌单
当我产生以下情绪
就会开起来听
让对应的音乐接住我
我都听3-5首歌大约15分钟
让我有个空间喘息
短暂释放压力
脑子比较清晰可以思考
颇实用,分享给大家