Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

407ca3448abc6c8c2385b17a0b709bb85c0c2e23a77a91a3e4fdae59a8093d222ea2de6b01be80e01e9d17f16f7072d22bc78038c6eeaa9e6ca5edb59bd51eeb

Ciphertext (hexencoded):

407ca3448abc6c8c2385b17a0b709bb8 5c0c2e23a77a91a3e4fdae59a8093d22 2ea2de6b01be80e01e9d17f16f7072d2 2bc78038c6eeaa9e6ca5edb59bd51eeb

Plaintext (hexencoded):

407ca3448abc6c8c2385b17a0b709bb8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

@|\xa3D\x8a\xbcl\x8c#\x85\xb1z\x0bp\x9b\xb8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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