Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

33927e485130793f5756419ddb49fd6635ae838a0b342e02c7455714fa0f0223434b7852757a76a03727b0c3fa0de2637b50eea99ff3e133795e7b3f5db9350b

Ciphertext (hexencoded):

33927e485130793f5756419ddb49fd66 35ae838a0b342e02c7455714fa0f0223 434b7852757a76a03727b0c3fa0de263 7b50eea99ff3e133795e7b3f5db9350b

Plaintext (hexencoded):

33927e485130793f5756419ddb49fd66 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

3\x92~HQ0y?WVA\x9d\xdbI\xfdf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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