标签：编码 return duo 扩展 _. str def

二进制

base64

python —— base64 encode/decode
编码解码

class CustomBase64:

    CHAR_SET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0!@#$%^&*()-"

    @classmethod
    def encode(cls, s: str) -> str:
        binary_str = ''.join(format(ord(c), '08b') for c in s)  # 转化为二进制字符串
        padding = 3 - (len(s) % 3) if len(s) % 3 else 0  # 计算需要的填充
        binary_str += '0' * (padding * 8)

        index_strs = [binary_str[i:i + 6] for i in range(0, len(binary_str), 6)]
        encoded = ''.join(cls.CHAR_SET[int(index_str, 2)] for index_str in index_strs)

        return encoded[:-padding] + "=" * padding  # 添加填充

    @classmethod
    def decode(cls, s: str) -> str:
        padding = s.count('=')
        s = s.rstrip('=')

        binary_str = ''.join(format(cls.CHAR_SET.index(c), '06b') for c in s)  # 转化为二进制字符串
        byte_strs = [binary_str[i:i + 8] for i in range(0, len(binary_str), 8)][:-padding]

        decoded = ''.join(chr(int(byte_str, 2)) for byte_str in byte_strs)

        return decoded

base64包

base64换表


print(base64.b64decode("SGVsbG*sIFdvcmxkIQ==".translate(str.maketrans("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0!@#$%^&*()-", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"))).decode('utf-8'))

使用标准表作为媒介，转换后进行映射

base64隐写

helo -> aGVsbw== 
word -> d29yZA==

helo -> aGVsbw== -> w 48 -> 110000
word -> d29yZA== -> A 0  -> 000000

隐写a->0110 0001

 w 48 -> 110000 -> 110110 -> 54 -> 2
 A 0  -> 000000 -> 000001 -> 1  -> B

编码变为

helo -> aGVsb2==
word -> d29yZB==

文本混淆

社会主义核心价值观编码——有点小问题

import random

import urllib.parse

def assert_(*express):
    l = len(express)
    msg = express[l-1] if isinstance(express[l-1], str) else 'Assert Error'
    for b in express:
        if not b:
            raise AssertionError(msg)

def rand_bin():
    return random.random() >= 0.5

values = '富强民主文明和谐自由平等公正法治爱国敬业诚信友善'

def str2utf8(s):
    not_encoded = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.!~*'()"
    str1 = ''.join([c if c in not_encoded else format(ord(c), 'x') for c in s])
    str2 = urllib.parse.quote(str1)
    concated = str2.replace('%', '').upper()
    return concated

def utf82str(utfs):
    assert_(isinstance(utfs, str), 'utfs Error')
    l = len(utfs)
    assert_((l & 1) == 0)
    splited = []
    for i in range(l):
        if (i & 1) == 0:
            splited.append('%')
        splited.append(utfs[i])
    return urllib.parse.unquote(''.join(splited))

def hex2duo(hexs):
    assert_(isinstance(hexs, str))
    duo = []
    for c in hexs:
        n = int(c, 16)
        if n < 10:
            duo.append(n)
        else:
            if rand_bin():
                duo.append(10)
                duo.append(n - 10)
            else:
                duo.append(11)
                duo.append(n - 6)
    return duo
    
def duo2hex(duo):
    assert_(isinstance(duo, list))
    hexs = []
    l = len(duo)
    i = 0
    while i < l:
        if duo[i] < 10:
            hexs.append(duo[i])
        else:
            i += 1
            if duo[i-1] == 10:
                hexs.append(duo[i] + 10)
            else:
                hexs.append(duo[i] + 6)
        i += 1
    return ''.join([format(v, 'X') for v in hexs])

def duo2values(duo):
    return ''.join([values[2*d] + values[2*d+1] for d in duo])

def values_decode(encoded):
    duo = []
    for c in encoded:
        i = values.find(c)
        if i == -1 or i & 1:
            continue
        duo.append(i >> 1)
    hexs = duo2hex(duo)
    assert_((len(hexs) & 1) == 0)
    try:
        return utf82str(hexs)
    except Exception as e:
        raise e

def values_encode(s):

    return duo2values(hex2duo(str2utf8(s)))

# ------------------

# 假设你有一个简单的命令行界面来代替 HTML 元素

def main():
    while True:
        choice = input("选择操作 (encode/decode/exit): ").strip().lower()
        if choice == 'encode':
            decoded = input("输入要编码的字符串: ").strip()
            encoded = values_encode(decoded)
            print(f"编码结果: {encoded}")
        elif choice == 'decode':
            encoded = input("输入要解码的字符串: ").strip()
            decoded = values_decode(encoded)
            print(f"解码结果: {decoded}")
        elif choice == 'exit':
            break
        else:
            print("无效的选择，请重新输入。")

if __name__ == "__main__":
    main()

兽音译者

beast = ['嗷', '呜', '啊', '~']

def str2hex(text: str):
    ret = ""
    for x in text:
        charHexStr = hex(ord(x))[2:]
        if len(charHexStr) == 3:
            charHexStr = "0" + charHexStr
        elif len(charHexStr) == 2:
            charHexStr = "00" + charHexStr
        ret += charHexStr
    return ret

def hex2str(text: str):
    ret = ""
    for i in range(0, len(text), 4):
        unicodeHexStr = text[i:i + 4]
        charStr = chr(int(unicodeHexStr, 16))
        ret += charStr
    return ret

def encode(str):
    hexArray = list(str2hex(str))
    code = ""
    n = 0
    for x in hexArray:
        k = int(x, 16) + n % 16
        if k >= 16:
            k -= 16
        code += beast[int(k / 4)] + beast[k % 4]
        n += 1
    return code

def decode(str):
    hexArray = list(str)
    code = ""
    for i in range(0, len(hexArray), 2):
        pos1 = beast.index(hexArray[i])
        pos2 = beast.index(hexArray[i + 1])
        k = ((pos1 * 4) + pos2) - (int(i / 2) % 16)
        if k < 0:
            k += 16
        code += hex(k)[2:]
    return hex2str(code)

if __name__ == '__main__':
    print(encode("你好"))
    print(decode("呜嗷嗷嗷啊嗷嗷~啊呜~啊~呜呜嗷"))

一些抽象的

与佛论禅
源版：https://www.keyfc.net/bbs/tools/tudoucode.aspx

GitHub 开源重制：https://github.com/takuron/talk-with-buddha

阴阳怪气编码：https://github.com/mmdjiji/yygq.js
尊嘟假嘟编码：https://github.com/YunChenqwq/ZunDuJiaDulanguageTranslator

代码混淆

原文：test

jsfuck ： (!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]
Brainfuck ：+++++ +++++ [->++ +++++ +++<] >++++ +++++ +++++ ++.<+ ++[-> ---<] >---- --.<+ ++[-> +++<] >++++ +.+.<
JJEncode ：_=~[];_={___:++_,$$$$:(![]+"")[_],__$:++_,$_$_:(![]+"")[_],_$_:++_,$_$$:({}+"")[_],$$_$:(_[_]+"")[_],_$$:++_,$$$_:(!""+"")[_],$__:++_,$_$:++_,$$__:({}+"")[_],$$_:++_,$$$:++_,$___:++_,$__$:++_};_.$_=(_.$_=_+"")[_.$_$]+(_._$=_.$_[_.__$])+(_.$$=(_.$+"")[_.__$])+((!_)+"")[_._$$]+(_.__=_.$_[_.$$_])+(_.$=(!""+"")[_.__$])+(_._=(!""+"")[_._$_])+_.$_[_.$_$]+_.__+_._$+_.$;_.$$=_.$+(!""+"")[_._$$]+_.__+_._+_.$+_.$$;_.$=(_.___)[_.$_][_.$_];_.$(_.$(_.$$+"\""+_.__+_.$$$_+"\\"+_.__$+_.$$_+_._$$+_.__+"\"")())();
AAEncode：ﾟωﾟﾉ= /｀ｍ´）ﾉ ~┻━┻ //*´∇｀*/ ['_']; o=(ﾟｰﾟ) =_=3; c=(ﾟΘﾟ) =(ﾟｰﾟ)-(ﾟｰﾟ); (ﾟДﾟ) =(ﾟΘﾟ)= (o^_^o)/ (o^_^o);(ﾟДﾟ)={ﾟΘﾟ: '_' ,ﾟωﾟﾉ : ((ﾟωﾟﾉ==3) +'_') [ﾟΘﾟ] ,ﾟｰﾟﾉ :(ﾟωﾟﾉ+ '_')[o^_^o -(ﾟΘﾟ)] ,ﾟДﾟﾉ:((ﾟｰﾟ==3) +'_')[ﾟｰﾟ] }; (ﾟДﾟ) [ﾟΘﾟ] =((ﾟωﾟﾉ==3) +'_') [c^_^o];(ﾟДﾟ) ['c'] = ((ﾟДﾟ)+'_') [ (ﾟｰﾟ)+(ﾟｰﾟ)-(ﾟΘﾟ) ];(ﾟДﾟ) ['o'] = ((ﾟДﾟ)+'_') [ﾟΘﾟ];(ﾟoﾟ)=(ﾟДﾟ) ['c']+(ﾟДﾟ) ['o']+(ﾟωﾟﾉ +'_')[ﾟΘﾟ]+ ((ﾟωﾟﾉ==3) +'_') [ﾟｰﾟ] + ((ﾟДﾟ) +'_') [(ﾟｰﾟ)+(ﾟｰﾟ)]+ ((ﾟｰﾟ==3) +'_') [ﾟΘﾟ]+((ﾟｰﾟ==3) +'_') [(ﾟｰﾟ) - (ﾟΘﾟ)]+(ﾟДﾟ) ['c']+((ﾟДﾟ)+'_') [(ﾟｰﾟ)+(ﾟｰﾟ)]+ (ﾟДﾟ) ['o']+((ﾟｰﾟ==3) +'_') [ﾟΘﾟ];(ﾟДﾟ) ['_'] =(o^_^o) [ﾟoﾟ] [ﾟoﾟ];(ﾟεﾟ)=((ﾟｰﾟ==3) +'_') [ﾟΘﾟ]+ (ﾟДﾟ) .ﾟДﾟﾉ+((ﾟДﾟ)+'_') [(ﾟｰﾟ) + (ﾟｰﾟ)]+((ﾟｰﾟ==3) +'_') [o^_^o -ﾟΘﾟ]+((ﾟｰﾟ==3) +'_') [ﾟΘﾟ]+ (ﾟωﾟﾉ +'_') [ﾟΘﾟ]; (ﾟｰﾟ)+=(ﾟΘﾟ); (ﾟДﾟ)[ﾟεﾟ]='\\'; (ﾟДﾟ).ﾟΘﾟﾉ=(ﾟДﾟ+ ﾟｰﾟ)[o^_^o -(ﾟΘﾟ)];(oﾟｰﾟo)=(ﾟωﾟﾉ +'_')[c^_^o];(ﾟДﾟ) [ﾟoﾟ]='\"';(ﾟДﾟ) ['_'] ( (ﾟДﾟ) ['_'] (ﾟεﾟ+(ﾟДﾟ)[ﾟoﾟ]+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (o^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟoﾟ]) (ﾟΘﾟ)) ('_');

密码类编码

DNA
- idea：https://www.geeksforgeeks.org/dna-protein-python-3/
- 轮子：https://github.com/karma9874/DNA-Cipher-Script-CTF

图片码

中文 wiki- 条形码

二进制转二维码

from PIL import Image

def generate_qrcode_from_binary(binary_str, img_size):

    assert len(binary_str) == img_size[0] * img_size[1], "Size mismatch!"

    pic = Image.new("RGB", img_size, color="white")
    index = 0
    for y in range(img_size[1]):
        for x in range(img_size[0]):
            if binary_str[index] == '1':
                pic.putpixel([x, y], (0, 0, 0))
            index += 1
    return pic

# 示例二进制数据
binary_data = "1111111000100001101111111100000101110010110100000110111010100000000010111011011101001000000001011101101110101110110100101110110000010101011011010000011111111010101010101111111000000001011101110000000011010011000001010011101101111010101001000011100000000000101000000001001001101000100111001111011100111100001110111110001100101000110011100001010100011010001111010110000010100010110000011011101100100001110011100100001011111110100000000110101001000111101111111011100001101011011100000100001100110001111010111010001101001111100001011101011000111010011100101110100100111011011000110000010110001101000110001111111011010110111011011"  

img_size = (25, 25)
qrcode = generate_qrcode_from_binary(binary_data, img_size)
qrcode.show()
qrcode.save("flag.png")

二维码修复
二维码拼接

tool

- https://merri.cx/qrazybox/

URL编码

URL 编码,也被称为百分号编码，是一种编码机制，用于将不安全或特殊的字符转换为%后跟其 ASCII 的十六进制表示，以确保 URL 的安全传输。
通常的 url 编码只会处理符号和不可见字符，比如 Squdgy fez, blank jimp crwth vox会被编码为 Squdgy%20fez%2C%20blank%20jimp%20crwth%20vox (普通类型)
但在 CTF 中我们可能会将其编码为%53%71%75%64%67%79%20%66%65%7a%2c%20%62%6c%61%6e%6b%20%6a%69%6d%70%20%63%72%77%74%68%20%76%6f%78 (复杂类型)
甚至出现多次 Url 编码的情况，当然这可能存在一些恶趣味，但是在渗透过程中，多次 url 编码确实是一种有效的 Bypass 手段。

标签：编码,return,duo,扩展,_.,str,def
From： https://www.cnblogs.com/Remakeee/p/18377532

编码扩展

二进制

base64

base64换表

base64隐写

文本混淆

社会主义核心价值观编码——有点小问题

兽音译者

一些抽象的

代码混淆

密码类编码

图片码

二进制转二维码

URL编码

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