Block cipher challenge

Level: CTR mode

Sorry, you're not an admin (need is_admin: true)



Ciphertext (hexencoded), for easy copy-paste

9a49ea7ebbcfebeb5cfe9d86291fb63908cc4c90a49e2a727e454c90df15ab2e5c5de7506b1e78466b098023ee4f64eb0a0215f8f9402bf798a13a16490f5b11

Ciphertext (hexencoded):

9a49ea7ebbcfebeb5cfe9d86291fb639 08cc4c90a49e2a727e454c90df15ab2e 5c5de7506b1e78466b098023ee4f64eb 0a0215f8f9402bf798a13a16490f5b11

Plaintext (hexencoded):

9a49ea7ebbcfebeb5cfe9d86291fb639 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9aI\xea~\xbb\xcf\xeb\xeb\\\xfe\x9d\x86)\x1f\xb69 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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