cryptoeasy

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hackthebox

Task: WAV file containing flag characters encoded as summed sine waves with frequency=ASCII*multiplier and amplitude=position. Solution: FFT decomposition to extract frequency peaks, then decode amplitude->position and frequency->character.

$ ls tags/ techniques/
signal_processingwavfftfourier_transformsine_wavescipy
fft_decompositionfrequency_amplitude_recoverypeak_detection
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