Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9b451dcb64d14b9b9ea814449f418a13f54bf3abc48f3d16a37cdec4928d97da8c68fde417af0fd13d3869fee17b9531516a064e1e82311ab0edc138f32465e1

Ciphertext (hexencoded):

9b451dcb64d14b9b9ea814449f418a13 f54bf3abc48f3d16a37cdec4928d97da 8c68fde417af0fd13d3869fee17b9531 516a064e1e82311ab0edc138f32465e1

Plaintext (hexencoded):

9b451dcb64d14b9b9ea814449f418a13 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9bE\x1d\xcbd\xd1K\x9b\x9e\xa8\x14D\x9fA\x8a\x13 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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