Black Hole

  • First I download challenge file into my machine and extract this file
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  • After extract , I got archive.zip
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  • Extract this archive.zip file , I got one photo name is hawking
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  • I use steghide to extract this file
    In this time I think this image file name is hawking , This passphrace can be hawking . It work i got flag.txt
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  • I see this flag file , It's can be a base64 encode data
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  • I decode this base64 encode data , I got base64 encode data again
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  • I decode this data again , Finally I got some data
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  • This data can be encrypt with caser cipher , I use online decoder to decode this
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Finally I got Flag