Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

614770ec8b41660d49c9c3791c81f4f8cb39fbd280244e38a2498ec90ff81be980df64cafce764521506881b79746a53b9b9c778bf8d7724f6ac311f654b6f06

Ciphertext (hexencoded):

614770ec8b41660d49c9c3791c81f4f8 cb39fbd280244e38a2498ec90ff81be9 80df64cafce764521506881b79746a53 b9b9c778bf8d7724f6ac311f654b6f06

Plaintext (hexencoded):

614770ec8b41660d49c9c3791c81f4f8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

aGp\xec\x8bAf\rI\xc9\xc3y\x1c\x81\xf4\xf8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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