Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d61675e9823a0bec9cd583728c45d92f1554a19754ceceda16dd4e0900f681ec7597fd74bb321b4720fa8bc3533d4d457b6949a1318644c6cd852d2f41949abc

Ciphertext (hexencoded):

d61675e9823a0bec9cd583728c45d92f 1554a19754ceceda16dd4e0900f681ec 7597fd74bb321b4720fa8bc3533d4d45 7b6949a1318644c6cd852d2f41949abc

Plaintext (hexencoded):

d61675e9823a0bec9cd583728c45d92f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd6\x16u\xe9\x82:\x0b\xec\x9c\xd5\x83r\x8cE\xd9/ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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