Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

db6d3a6dd0e2be0ceebe7417eef0dff85541be469a45bd3455a4ce0853bdf28edb734803dc4a024730ebc1d811f0f61987bccc2091db6eec15b69d4abc245b0d

Ciphertext (hexencoded):

db6d3a6dd0e2be0ceebe7417eef0dff8 5541be469a45bd3455a4ce0853bdf28e db734803dc4a024730ebc1d811f0f619 87bccc2091db6eec15b69d4abc245b0d

Plaintext (hexencoded):

db6d3a6dd0e2be0ceebe7417eef0dff8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xdbm:m\xd0\xe2\xbe\x0c\xee\xbet\x17\xee\xf0\xdf\xf8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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