Sunday, March 20, 2016

Write Up CTF Fit Competition UKSW 2016 - CRYPTOGRAPHY [ Lols ]

Diberiakan soal jenis base64 tipe image :

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

untuk melakukan decode dapat menggunakan browser chrome

data:image/jpeg;base64,"masukkan base64 image" (tanpa petik)
setelah dibuka
didapatkan sebuah gambar barcode :



Coba baca menggunakan aplikasi barcode scanner diandroid dan didapatkan flag :


Flag : FIT2016{antonliM_64nt3ng}

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