签到2

题目内容：

有一段密文是U2FsdGVkX19tOHd3WJ7Fl6oBWeyy6gF4Y755Jsu/A/qhKplZNmmJgL8DTkXkdwGw7v2to6rYJ2PCHYjjrn4weQ== 它的密码为aes-256-cbc

AES加密直接解

得到flag：

flag{0ddd6003-0c67-4093-8dab-8660b57f8289}

Covertchannel2

下载下来后通过分析wireshark

发现了rsa.key

secrect.txt

data.zip

将里面内容提取出来，通过脚本去掉不要的字符

exp.py

s="....MQTT...<..python-mqtt-611 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hon/mqttMndZQUFHUmhkR0V20.../python/mqttWWpjNVpERTVNREF00.../python/mqttWkRjMk1pMDBZbVkz0.../python/mqttTFdGbU1qQXRObUky0.../python/mqttWlRBek16ZzVNMlU00.../python/mqttClZWUUZBQU1HL2dK0.../python/mqtta2RYZ0xBQUVFOVFF0.../python/mqttQUFBUVVBQUFBVUVz0.../python/mqttRkJnQUFBQUFFQUFR0.../python/mqttQWRRRUFBUGtJQUFB0.../python/mqttQUFBPT0K"
f=open("MQTT.txt","w")
s=s.replace("0.../python/mqtt","")
print(s)

提取出来后得到数据

将rsa.key的数据放入cyber里解

得到private_key

将scerect.txt放入cyber解一下后

将两个一起放入网上RSA解密得到 key

将data.zip放入cyber里解两次base64得到PK头，保存导出为zip

将key放入解开zip

在里面得到flag

flag{a3e0f096-17ed-4c0b-8895-4dd0cbabafaf}