Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ce78df598018661d8c658b789d1656bd17e9c7581668a47f96d51135ab0249645acdfaefa77fc267ce6db508adfd3c62d26c2d1d913d59d1240ee35d68f6dd50

Ciphertext (hexencoded):

ce78df598018661d8c658b789d1656bd 17e9c7581668a47f96d51135ab024964 5acdfaefa77fc267ce6db508adfd3c62 d26c2d1d913d59d1240ee35d68f6dd50

Plaintext (hexencoded):

ce78df598018661d8c658b789d1656bd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xcex\xdfY\x80\x18f\x1d\x8ce\x8bx\x9d\x16V\xbd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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