Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

7eb955fe2a70898fc525230a4aa782245d96e751b9c3431409d1dad9de7c50aecddbad1d950053efdf4bb2b18166dc1eb444764f874bf81e51c1f08eb71b8327

Ciphertext (hexencoded):

7eb955fe2a70898fc525230a4aa78224 5d96e751b9c3431409d1dad9de7c50ae cddbad1d950053efdf4bb2b18166dc1e b444764f874bf81e51c1f08eb71b8327

Plaintext (hexencoded):

7eb955fe2a70898fc525230a4aa78224 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

~\xb9U\xfe*p\x89\x8f\xc5%#\nJ\xa7\x82$ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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