Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e979e101c1abcf162ac32c5cd8ecc4820464eb026935f0faa8ef883bb41412b76bef94666972f0a8b799900c50950717793e6c131e82ee77c00a6be22a395ed5

Ciphertext (hexencoded):

e979e101c1abcf162ac32c5cd8ecc482 0464eb026935f0faa8ef883bb41412b7 6bef94666972f0a8b799900c50950717 793e6c131e82ee77c00a6be22a395ed5

Plaintext (hexencoded):

e979e101c1abcf162ac32c5cd8ecc482 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe9y\xe1\x01\xc1\xab\xcf\x16*\xc3,\\\xd8\xec\xc4\x82 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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