Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

eab09275a5779cc820779553d4d67d5b08596050f870437f908b3448ce3bd2f986eed517b5a0055e6bed2a3ff95d279431e669feb5e4c179e740b069d73b96ab

Ciphertext (hexencoded):

eab09275a5779cc820779553d4d67d5b 08596050f870437f908b3448ce3bd2f9 86eed517b5a0055e6bed2a3ff95d2794 31e669feb5e4c179e740b069d73b96ab

Plaintext (hexencoded):

eab09275a5779cc820779553d4d67d5b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xea\xb0\x92u\xa5w\x9c\xc8 w\x95S\xd4\xd6}[ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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