Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

66c1b2579101d7352866ffa81bf6e747fb8bcb4350e8c16a5ac8123d5861939bf5bebeefc39dba964a809ee155ace27cd4f8402fabf886681f26012ea11a829a

Ciphertext (hexencoded):

66c1b2579101d7352866ffa81bf6e747 fb8bcb4350e8c16a5ac8123d5861939b f5bebeefc39dba964a809ee155ace27c d4f8402fabf886681f26012ea11a829a

Plaintext (hexencoded):

66c1b2579101d7352866ffa81bf6e747 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

f\xc1\xb2W\x91\x01\xd75(f\xff\xa8\x1b\xf6\xe7G {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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