Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a47a59a73d38e393bad7b528184e64cd7cc4c97fdf8878d9d02ad78b0e059e02cdd14f6ffca81a23ac075de603ce784d1ea40070c7767ede191395b831889f46

Ciphertext (hexencoded):

a47a59a73d38e393bad7b528184e64cd 7cc4c97fdf8878d9d02ad78b0e059e02 cdd14f6ffca81a23ac075de603ce784d 1ea40070c7767ede191395b831889f46

Plaintext (hexencoded):

a47a59a73d38e393bad7b528184e64cd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa4zY\xa7=8\xe3\x93\xba\xd7\xb5(\x18Nd\xcd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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