BKM stands for Blum-Kalai-Matyas algorithm. It's an algorithm that was developed by two people, Manuel Blum and Shafi Goldwasser, and one computer scientist, Mihaly Matyas. It's used to encrypt data to make sure it's secure. It works by taking a block of data (like a text message) and breaking it into smaller pieces. These pieces are then rearranged in a way that makes it hard for someone else to figure out what the original message was. By encrypting the data in this way, it protects it from being stolen or misused.