Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

f5cd27f1756ecaf03a3609e9850156306f239b48241198f39e1e21a1ae76fc46741ba51773f0a7d430911828c9ea03345c20f6d72da7c15c772665ed541c71ac

Ciphertext (hexencoded):

f5cd27f1756ecaf03a3609e985015630 6f239b48241198f39e1e21a1ae76fc46 741ba51773f0a7d430911828c9ea0334 5c20f6d72da7c15c772665ed541c71ac

Plaintext (hexencoded):

f5cd27f1756ecaf03a3609e985015630 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf5\xcd\'\xf1un\xca\xf0:6\t\xe9\x85\x01V0 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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