Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e326ea4fa12cf07af2d0f9b9345d24137e42f44ea94cd8e61777b86182306ed08b6b7b1dff84487ceb47eb6e7bb815a5a80c83345f2ab02edfc10d328d886bf2

Ciphertext (hexencoded):

e326ea4fa12cf07af2d0f9b9345d2413 7e42f44ea94cd8e61777b86182306ed0 8b6b7b1dff84487ceb47eb6e7bb815a5 a80c83345f2ab02edfc10d328d886bf2

Plaintext (hexencoded):

e326ea4fa12cf07af2d0f9b9345d2413 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe3&\xeaO\xa1,\xf0z\xf2\xd0\xf9\xb94]$\x13 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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