function encrypt($plaintext ) { // hash the key to a fixed length $hashed_key = hash('sha256', 'kDLTzj2QGCenCXW8s44h4ddDjeJiuSP2', true); // pad the plaintext with whitespace to be a multiple of 16 bytes $padded_plaintext = str_pad($plaintext, strlen($plaintext) + 16 - strlen($plaintext) % 16); // encrypt the padded plaintext with the hashed key $iv = openssl_random_pseudo_bytes(16); $ciphertext = openssl_encrypt($padded_plaintext, 'AES-256-CBC', $hashed_key, OPENSSL_RAW_DATA, $iv); $ciphertext = base64_encode($iv . $ciphertext); return $ciphertext; } function decrypt($ciphertext) { // hash the key to a fixed length $hashed_key = hash('sha256', 'kDLTzj2QGCenCXW8s44h4ddDjeJiuSP2', true); // decrypt the ciphertext with the hashed key $ciphertext = base64_decode($ciphertext); $iv = substr($ciphertext, 0, 16); $ciphertext = substr($ciphertext, 16); $padded_plaintext = openssl_decrypt($ciphertext, 'AES-256-CBC', $hashed_key, OPENSSL_RAW_DATA, $iv); $plaintext = rtrim($padded_plaintext, "\0"); return $plaintext; } ?>
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Harland and Storey (2000a, November 01). Millennial mediavores . ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/millennial-mediavores-
Grønholdt, L. (1996a, November 11). Advertising effect modelling. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/advertising-effect-modelling
Laborie and Santini (1996a, November 11). Fourth generation media planning systems. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/fourth-generation-media-planning-systems
Collins and Bhatia (2001a, June 01). Integrating Internet site audience measurement into media planning and buying . ANA - ESOMAR. Retrieved March 31, 2023, from
Amoroso and Jannacone (1979a, June 15). Control techniques in a sample survey. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/control-techniques-in-a-sample-survey
Wyss, W. (1963a, June 15). A new pretest for advertisements . ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/a-new-pretest-for-advertisements-
Schipper, J. A. (1985a, February 27). Competitive analysis and media planning. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/competitive-analysis-and-media-planning
Rusby and Shields (1988a, June 15). Measuring a multi-country specialist audience: The international air travel survey. ANA - ESOMAR. Retrieved March 31, 2023, from
B.V., A. (1990a, January 01). ARF guidelines for newspaper audience studies. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/arf-guidelines-for-newspaper-audience-studies