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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Zaepfel, Hennes and Guinaudeau (2019a, November 10). iFactor. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/ifactor
Patterson, R. (1997a, June 15). Loyalty cards. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/loyalty-cards
Kushari, I. (2004a, February 01). Ads that click. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/ads-that-click
Farmer and Stockley (2005a, June 21). Diaries for digital delivery. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/diaries-for-digital-delivery
Sharma and Pugh (2007a, November 12). Serpents with tails in their mouths. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/serpents-with-tails-in-their-mouths
Ma, Lee and Rademacher (2007a, September 19). Local jewels and global heroes. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/local-jewels-and-global-heroes
Staplehurst, Heak and Green (2008a, April 09). Measuring the business elites of India and China. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/measuring-the-business-elites-of-india-and-china
Mora, Antelo, Naranjo and Sanchez (2016a, April 13). Mobile technology. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/mobile-technology
Cundiff, Egner and Vaughn (2015a, October 01). A butterfly's wings: from chaos to opportunity. ANA - ESOMAR. Retrieved March 31, 2023, from
https://ana.esomar.org/documents/a-butterfly-s-wings-from-chaos-to-opportunity