Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

7ea2e570c2f76b0955e33ecb8503975dd9cfc17c98d9739227c055207ebf33866a8888bb8660dc0bf21ac895bde207e4c69971de8315ed73afddf5c0849c36fb

Ciphertext (hexencoded):

7ea2e570c2f76b0955e33ecb8503975d d9cfc17c98d9739227c055207ebf3386 6a8888bb8660dc0bf21ac895bde207e4 c69971de8315ed73afddf5c0849c36fb

Plaintext (hexencoded):

7ea2e570c2f76b0955e33ecb8503975d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

~\xa2\xe5p\xc2\xf7k\tU\xe3>\xcb\x85\x03\x97] {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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