Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

87361af2b1442683a8ca050bf4c98a2e65c44d5901f13cbcf5f5caf7d7f6bb27b76743359e3f79f9693d539b7762f157747e14dff4d05264f4497bbcff54a0dd

Ciphertext (hexencoded):

87361af2b1442683a8ca050bf4c98a2e 65c44d5901f13cbcf5f5caf7d7f6bb27 b76743359e3f79f9693d539b7762f157 747e14dff4d05264f4497bbcff54a0dd

Plaintext (hexencoded):

87361af2b1442683a8ca050bf4c98a2e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x876\x1a\xf2\xb1D&\x83\xa8\xca\x05\x0b\xf4\xc9\x8a. {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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