Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

699de5d2cc4efbcc333f057beba44ffa639b8873496a5197770233c227d6f2e9912872e6dc64c9d86a298e51cbfc64c8a1c62b69ffa34ebf09e23251d7add4a6

Ciphertext (hexencoded):

699de5d2cc4efbcc333f057beba44ffa 639b8873496a5197770233c227d6f2e9 912872e6dc64c9d86a298e51cbfc64c8 a1c62b69ffa34ebf09e23251d7add4a6

Plaintext (hexencoded):

699de5d2cc4efbcc333f057beba44ffa 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

i\x9d\xe5\xd2\xccN\xfb\xcc3?\x05{\xeb\xa4O\xfa {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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