Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

62b295abda6d4ea2c24e267886f507b5a0dd901408a18901343da220ade6c654a2200228d3209eba6e58ee5c9027056c13a1d75552c3e5c2f769834c42d3bbba

Ciphertext (hexencoded):

62b295abda6d4ea2c24e267886f507b5 a0dd901408a18901343da220ade6c654 a2200228d3209eba6e58ee5c9027056c 13a1d75552c3e5c2f769834c42d3bbba

Plaintext (hexencoded):

62b295abda6d4ea2c24e267886f507b5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

b\xb2\x95\xab\xdamN\xa2\xc2N&x\x86\xf5\x07\xb5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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