Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

874eaa3d50897181c58f3da1159d2a2fac546f91da071064553b43a9088e633648930a93c520edc8408ebb51ddc7f20615024377112259fe5f0d6a4c5b2cacf2

Ciphertext (hexencoded):

874eaa3d50897181c58f3da1159d2a2f ac546f91da071064553b43a9088e6336 48930a93c520edc8408ebb51ddc7f206 15024377112259fe5f0d6a4c5b2cacf2

Plaintext (hexencoded):

874eaa3d50897181c58f3da1159d2a2f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x87N\xaa=P\x89q\x81\xc5\x8f=\xa1\x15\x9d*/ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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