TENET

VishwaCtf{7H3_FUTUR3_HAS_ALR3ADY_H4PP3N3D}

This is one of my favourite chals

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sator_arepo_tenet was password for the stegseek or steghide

Then we got a file named flag.txt and we need to decrypt that U2FsdGVkX1/7+V1o59yZ8g3TFdiYlCkbIgYMPx4qIV8ECViq1CNiveKje89pltcN 0+JIHaE5YZcbn9UjV+wFfw== this was the cipher

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In cyberchef we reversed it and got the flag

Cyberchef