Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e9c25cd0991f7743192a6cc6f220fe84dd58197bf3c48c339f85f18027b3c1eda5d0b2fbc241828d90975a7a7462e3e97cb8e45b89c410179d9a2d02d4f73d53

Ciphertext (hexencoded):

e9c25cd0991f7743192a6cc6f220fe84 dd58197bf3c48c339f85f18027b3c1ed a5d0b2fbc241828d90975a7a7462e3e9 7cb8e45b89c410179d9a2d02d4f73d53

Plaintext (hexencoded):

e9c25cd0991f7743192a6cc6f220fe84 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe9\xc2\\\xd0\x99\x1fwC\x19*l\xc6\xf2 \xfe\x84 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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