Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

4ac94012abe89c9e63805935da2c03c6172ac11a820476ec97f857d1a4f69b557a8d770644ddf42b0983bac95f75998bfed7f3af5ba41e66b24b755471fb1cca

Ciphertext (hexencoded):

4ac94012abe89c9e63805935da2c03c6 172ac11a820476ec97f857d1a4f69b55 7a8d770644ddf42b0983bac95f75998b fed7f3af5ba41e66b24b755471fb1cca

Plaintext (hexencoded):

4ac94012abe89c9e63805935da2c03c6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

J\xc9@\x12\xab\xe8\x9c\x9ec\x80Y5\xda,\x03\xc6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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