Marriott admits it falsely claimed for five years it was using encryption during 2018 breach | CSO Online https://www-csoonline-com.cdn.ampproject.org/c/s/www.csoonline.com/article/2096365/marriott-admits-it-falsely-claimed-for-five-years-it-was-using-encryption-during-2018-breach.html/amp/
In fact, it hadn’t been using any encryption at all at the time but rather had been using secure hash algorithm 1 (SHA-1), which is a hashing mechanism and not encryption.