Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

97ae14f451bdc7aefa17f4c249918d9a6ba9012daf1bbdbcd67ae7baa58a80cd89f5c1273d41c24bbc304161d57c126d88095317806475ff142e68235651874c

Ciphertext (hexencoded):

97ae14f451bdc7aefa17f4c249918d9a 6ba9012daf1bbdbcd67ae7baa58a80cd 89f5c1273d41c24bbc304161d57c126d 88095317806475ff142e68235651874c

Plaintext (hexencoded):

97ae14f451bdc7aefa17f4c249918d9a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x97\xae\x14\xf4Q\xbd\xc7\xae\xfa\x17\xf4\xc2I\x91\x8d\x9a {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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