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<?php $cipher = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, md5('my-key'), 'Hello World', MCRYPT_MODE_CBC); $plain = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, md5('not-my-key'), $cipher, MCRYPT_MODE_CBC); var_dump($plain);

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52.19 ms | 402 KiB | 5 Q