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RDxR10/Basement-Brunch-with-Simon-ISFCR.py

Created February 15, 2021 19:26
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Desc : Simon is waiting for you in basement 36 and wants to have brunch together. Take this key and ciphertext to enter the basement. Have a pleasant brunch! Key: 0xABBBAAABAABAAABAAABABAABAAABABBA CT: 0xDCD9D598AE2990D31F230F3BE7813716 NOTE: Enclose flag within PESUCTF{} ALPHANUMERIC format : ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
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Basement-Brunch-with-Simon-ISFCR.py
from simon import SimonCipher
my_simon = SimonCipher(0xABBBAAABAABAAABAAABABAABAAABABBA)
simon_ciphertext = 0xDCD9D598AE2990D31F230F3BE7813716
simon_plaintext = my_simon.decrypt(simon_ciphertext)
print(hex(simon_plaintext)[2:])
#note that this is in base36 format
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