Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1b3cd956fdf0b3fac73d0cc4eabbe5a5c6a6a64b78c55d15fc4bade6930b983a39078802f6d720db0f9582a42ab5e5ed8a7c32f970f278b0a48fad2ce8cc4ee1

Ciphertext (hexencoded):

1b3cd956fdf0b3fac73d0cc4eabbe5a5 c6a6a64b78c55d15fc4bade6930b983a 39078802f6d720db0f9582a42ab5e5ed 8a7c32f970f278b0a48fad2ce8cc4ee1

Plaintext (hexencoded):

1b3cd956fdf0b3fac73d0cc4eabbe5a5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1b<\xd9V\xfd\xf0\xb3\xfa\xc7=\x0c\xc4\xea\xbb\xe5\xa5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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