Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

0ba7529ae6af956a7605772ab88bf879c16508aca635c3b4c32e45f78de558aa85c3dbec99974988776d262c5dbb060be5d599a9165875a2f137f206ce941b4b

Ciphertext (hexencoded):

0ba7529ae6af956a7605772ab88bf879 c16508aca635c3b4c32e45f78de558aa 85c3dbec99974988776d262c5dbb060b e5d599a9165875a2f137f206ce941b4b

Plaintext (hexencoded):

0ba7529ae6af956a7605772ab88bf879 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x0b\xa7R\x9a\xe6\xaf\x95jv\x05w*\xb8\x8b\xf8y {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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