Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

842d37f3aeb5343ac81851fd1a0b9d3d04d2ffa62ffb3ffe456a26b0e9ba163ae5066392ab8a667f185055b1ce64722c4739c2e4be13ad50a54b53c52910f3a6

Ciphertext (hexencoded):

842d37f3aeb5343ac81851fd1a0b9d3d 04d2ffa62ffb3ffe456a26b0e9ba163a e5066392ab8a667f185055b1ce64722c 4739c2e4be13ad50a54b53c52910f3a6

Plaintext (hexencoded):

842d37f3aeb5343ac81851fd1a0b9d3d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x84-7\xf3\xae\xb54:\xc8\x18Q\xfd\x1a\x0b\x9d= {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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