Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d8300befc30377378c16349861e94bc255501d59e98974804fa6ceb58deefab38c8434707fcf6e9ded88cdf07be2bf55d767b1745b1fbb6eeed2653f9bd41fa4

Ciphertext (hexencoded):

d8300befc30377378c16349861e94bc2 55501d59e98974804fa6ceb58deefab3 8c8434707fcf6e9ded88cdf07be2bf55 d767b1745b1fbb6eeed2653f9bd41fa4

Plaintext (hexencoded):

d8300befc30377378c16349861e94bc2 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd80\x0b\xef\xc3\x03w7\x8c\x164\x98a\xe9K\xc2 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

{"username": "guest", "is_guest": true}