Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

00c99938164bd01b8d0757ef23f7d43addc6499b9e1b1ee2d5069c8382b66517dd56521d910148759d6791687f99328c621ce36aa1fd1e593a71739b97bee294

Ciphertext (hexencoded):

00c99938164bd01b8d0757ef23f7d43a ddc6499b9e1b1ee2d5069c8382b66517 dd56521d910148759d6791687f99328c 621ce36aa1fd1e593a71739b97bee294

Plaintext (hexencoded):

00c99938164bd01b8d0757ef23f7d43a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x00\xc9\x998\x16K\xd0\x1b\x8d\x07W\xef#\xf7\xd4: {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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