Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e94af75caccbc5319a0187d845b4f3aaef897e16c2059dbfa39780eb42f8196149006c6854ffdd01244e392ada6d424d123bdbcbc2e709dca853b17c94736392

Ciphertext (hexencoded):

e94af75caccbc5319a0187d845b4f3aa ef897e16c2059dbfa39780eb42f81961 49006c6854ffdd01244e392ada6d424d 123bdbcbc2e709dca853b17c94736392

Plaintext (hexencoded):

e94af75caccbc5319a0187d845b4f3aa 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe9J\xf7\\\xac\xcb\xc51\x9a\x01\x87\xd8E\xb4\xf3\xaa {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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