Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f6eea30e82a8ab918582c2b8a8fe11e1151a2b0e1b06be7c84407690fc10f159f90423acd3a9ad57c5e5dbf3717c5ce2d89f5ff95bc4496260e689ee34fa73a9

Ciphertext (hexencoded):

f6eea30e82a8ab918582c2b8a8fe11e1 151a2b0e1b06be7c84407690fc10f159 f90423acd3a9ad57c5e5dbf3717c5ce2 d89f5ff95bc4496260e689ee34fa73a9

Plaintext (hexencoded):

f6eea30e82a8ab918582c2b8a8fe11e1 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf6\xee\xa3\x0e\x82\xa8\xab\x91\x85\x82\xc2\xb8\xa8\xfe\x11\xe1 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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