SFeatherCTF2024

约 758 字大约 3 分钟

2024-12-29

CRYPTO

Base签到

编码

At

题目内容：

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Θﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (o^_^o))+ ((o^_^o) - (ﾟΘ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) + (o^_^o))+ (o^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟΘﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (o^_^o)+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (o^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (c^_^o)+ (c^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟΘﾟ)+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (o^_^o)+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (o^_^o)+ ((o^_^o) - (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟｰﾟ)+ (ﾟΘﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟｰﾟ)+ (ﾟΘﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟｰﾟ)+ (ﾟΘﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (o^_^o))+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟoﾟ]) (ﾟΘﾟ)) ('_');
hint:注意大小写

颜文字解密：

对结果进行随波逐流一把梭哈

发现是Atbash编码，提交flag发现不对，注意到hint，改大小写-》flag{Ni_h@O_A!!!}，over!

shuangyuCTF-AES & Base

import base64
import hashlib
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
fixed_key_part = b'fixedpart'[:8]
secret_prefix = b'secret_'
encoded_data = '[lg/hfCVaU7OGl11oy7JsUzozFojJSjBmYt6BGY+sO/KCKkQxdXzHjiJP1AM0eoTH]'
data = base64.b64decode(encoded_data)
iv = data[:16]
cipher_text = data[16:]
for i in range(1000):
    num_str = f"{i:03}"
    secret_part = secret_prefix + num_str.encode()
    secret_hash = hashlib.sha256(secret_part).digest()[:8]
    key = fixed_key_part + secret_hash
    try:
        cipher = AES.new(key, AES.MODE_CBC, iv)
        plain_text = unpad(cipher.decrypt(cipher_text), AES.block_size)
        decoded_text = plain_text.decode()
        print(f"尝试 {num_str}: {decoded_text}")
        if 'flag{' in decoded_text:
            print(f"找到 Flag: {decoded_text}")
            break
    except (ValueError, UnicodeDecodeError):
        continue

得到flag（用ai解答（doge））

shuangyuCTF-XOR

def xor_decrypt(encrypted_data, key):
    decrypted_data = bytearray()
    for char in encrypted_data:
        decrypted_data.append(char ^ key)
    return decrypted_data.decode()
key=13
encrypted_string = '7a6f796973746865666c6167'
decrypted_string = xor_decrypt(bytearray.fromhex(encrypted_string), key)
print(decrypted_string)

最后结果包上”flag{}“即可(ai帮助（doge）)

你真的喜欢CTF吗？

培根解密，全小写，然后包裹Flag{}(逆天，大写F，群里看到的)

crypto2

打开题目：

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网上找了找，发现是：JSFuck 加密,找网站解密：

得到flag

decode

rot13+base32(提示）

得到

然后漫长的套娃情节（出题人。。。）

a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
print(a[::-1])
b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
print(b[::-1])
c='======AJVSNIFZAKKKNQELFIVKVMVJRKKSWKUKVJX2UEEFZJHSROELNJUKSMFEZIV2UWUD5IKCTKUHZKT2QWEFVIVKWGFZQKLSVYUC5IU2UWUFFK2SRGEHNKGKSUFHVITSUGFCNJ2SRMVFNKSZTUEHRJV2VKFZYJLSWEELVKT2S6UDJJLSV6EJNJOSSUFDVIXKTGFKJJOCTKUG5KTCTSEJJIW2RIFZYIKSUYUCNKWSWGVFFK2SRWUJNKLSS4EDZKHSVGFNNJWSQKF2MKSBWOEFNJW2UMVF5IMSSMUCZGVSMGFFVGDKVSFKNKLKSIDNZIFSVWELFJ2CTKULVKTCVWEJRJW2SEVJ5JKSSEED5IWSM4UFZKDSVKVJNKV2S4EGZILSVWEBNJ2KRIUFNKTKUOEFNJEKTMVFFJ'
print(c[::-1])
d='IKVMDKJGQSSKDEZKBKVKFLNKUSSUVCVKN2VGFBJJOSRKVLRKTSUWELZIVKVEFZ4IKSTYUC5JS2U6EFJLGKVSVKJGX2S4UBVKZSVGVFNJKSSKFZQKSZVSELRJF2TGVBRILSWMELNJTSMWEFZJNKROVKJGOKSUVBZKN2UWULNJO2SKVFZKDSRSENZIFSNCFZQKKSTGELVKT2SYUEJKCSVOELJGGKSUFHVITKVGFGNJBSWMUEZJTSVUUAVH5JP2T6UH'
print(d[::-1])
f='======AJVSNIFZAKLSUSENZIF2VGVBRILKSUVCNJT2Q6EFZIFCVKUKNKWKSMVCZIN2UWEMNJK2SKVFZKDCSOELVIW2T2UJJKKSVYUCNKW2UYUFZJOSROELNJG2RUUFVKRSTWUFNJBSWMUEZJTSVUUAVH5JP2T6UH'
print(f[::-1])
g='======AJVSNIFZAKKKNQUKJGFKVGFNNKLSVSELVJRSMOVEVGHCVKUKJKXKSMFEVIVSUETEFJOCSKEZIKDCSWEFZIRKP2T6UH'
print(g[::-1])
h='====QFJKHCR2EHNII2RUEHVIWRUETG5IW2QMVIVKSZSUE2UH5JP2T6UH'
print(h[::-1])
i='======4JK2UQVCVGM2R6ENJGHCNMDGRK'
print(i[::-1])
k='TL64G2ZOGL5EXSJO'
print(k[::-1])
q='rerufvtnys'
print(q[::-1])