Description
For your first day working at ANSSI, you need to assist our expert in fault attacks.
She has recovered an old message encrypted by hardware performing AES-128 encryption.
Unfortunately, the circuit, which has all the AES subkeys in its protected memory, was exposed to ultraviolet light and got damaged.
Our expert has nevertheless been able to perform 3000 encryptions before the circuit completely broke, but it seems the ciphertexts obtained (ciphertexts.txt) contain some errors.
Can you extract the AES-128 master key and decrypt the message contained in flag.enc.json?
Files
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ciphertexts.txt
96.68 KiB – 99a927a43005e3b5a02a9e05777a15981fcf1a9b0ad1f6d8997c968b3ac2759e -
flag.enc.json
220 B – b9f9b6c44e933e3f57e5bd2092e12d3d62a8efde0b494eda21c981954fc533f6
Author
Flag
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