Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

559c8a3e38867e89b18394b37c9edfd9bd298d2e73ef2cdc5ddaaa7acf5997a31ea3e8ac61e9bd69be497a1085f4ca844dc6df114ee3592ea94dcc621360534c

Ciphertext (hexencoded):

559c8a3e38867e89b18394b37c9edfd9 bd298d2e73ef2cdc5ddaaa7acf5997a3 1ea3e8ac61e9bd69be497a1085f4ca84 4dc6df114ee3592ea94dcc621360534c

Plaintext (hexencoded):

559c8a3e38867e89b18394b37c9edfd9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

U\x9c\x8a>8\x86~\x89\xb1\x83\x94\xb3|\x9e\xdf\xd9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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