Here are some python3 scripts for Bugku Writeup

a-base64.py

import base64
import html
from urllib import parse

# 打开文件
with open('1.txt') as f:
    cipher_base64 = f.read()

# base64 解密
cipher_oct = base64.b64decode(cipher_base64.encode()).decode()

# 8 进制分割成列表
list_oct = cipher_oct.split('\\')
list_oct.pop(0)
# 连接 8 进制数成 bytes 再成 str
cipher_hex = bytes([int(i, 8) for i in list_oct]).decode()

# 解析 16 进制数成 bytes
cipher_unicode = bytes.fromhex(cipher_hex.replace('\\x', ''))

# 解析 unicode_escape
# cipher_charcode = bytes.fromhex(cipher_unicode.replace('\\u00', '')).decode()
cipher_charcode = cipher_unicode.decode('unicode_escape')

# 取出括号中内容并分割 ascii 码
list_charcode = cipher_charcode[20:-1].split(',')

# 连接 ascii 码并转成 str
cipher_html_1 = bytes([int(i) for i in list_charcode]).decode()

# 解析 html 转义符两次
cipher_html_2 = html.unescape(cipher_html_1)
cipher_url = html.unescape(cipher_html_2)

# 解析 url 转义符
flag = parse.unquote(cipher_url)

print(flag)

affine.py

cipher = 'szzyfimhyzd'
plain = ''

for c in cipher:
    y = ord(c) - ord('a')
    x = (y + 8) * 23 % 26
    plain += chr(x + ord('a'))

print(plain)

base-family.py

import base91
b91 = '@iH<,{bdR2H;i6*Tm,Wx2izpx2!'
flag = base91.decode(b91).decode()
print(flag)

Bugku Writeup.md

BugKu Writeup

Crypto

jefferson.py

jefferson_origin = ['ZWAXJGDLUBVIQHKYPNTCRMOSFE',
                    'KPBELNACZDTRXMJQOYHGVSFUWI',
                    'BDMAIZVRNSJUWFHTEQGYXPLOCK',
                    'RPLNDVHGFCUKTEBSXQYIZMJWAO',
                    'IHFRLABEUOTSGJVDKCPMNZQWXY',
                    'AMKGHIWPNYCJBFZDRUSLOQXVET',
                    'GWTHSPYBXIZULVKMRAFDCEONJQ',
                    'NOZUTWDCVRJLXKISEFAPMYGHBQ',
                    'QWATDSRFHENYVUBMCOIKZGJXPL',
                    'WABMCXPLTDSRJQZGOIKFHENYVU',
                    'XPLTDAOIKFZGHENYSRUBMCQWVJ',
                    'TDSWAYXPLVUBOIKZGJRFHENMCQ',
                    'BMCSRFHLTDENQWAOXPYVUIKZGJ',
                    'XPHKZGJTDSENYVUBMLAOIRFCQW']
key = [2, 5, 1, 3, 6, 4, 9, 7, 8, 14, 10, 13, 11, 12]
cipher = 'HCBTSXWCRQGLES'
jefferson = []

for i in range(14):
    current = jefferson_origin[key[i] - 1]
    start = current.index(cipher[i])
    current = current[start:] + current[:start]
    jefferson.append(current)

for i in range(26):
    for s in jefferson:
        print(s[i], end='')
    print()

number-base-conversion.py

with open('text.txt') as f:
    text = f.read()
numbers = text.split(' ')

base = {'d':10,
        'b':2,
        'o':8,
        'x':16,
        }

flag = ''
for number in numbers:
    flag += chr(int(number[1:], base[number[0]]))
print(flag)

tell-you-a-secret.py

import base64

hexStr = '636A56355279427363446C4A49454A7154534230526D684356445A31614342354E326C4B4946467A5769426961453067'
print(hexStr)

hex2bytes = bytes.fromhex(hexStr)
print(hex2bytes)

b64dec = base64.b64decode(hex2bytes)
print(b64dec)

this-is-not-md5.py

cipher = '666c61677b616537333538376261353662616566357d'
print(bytes.fromhex(cipher))