Salvador Mendoza presented on Samsung Pay and tokenized card numbers. He discussed terminology related to NFC, MST, tokens and tokenization. He analyzed the format of tokenized numbers and how they emulate physical cards. Mendoza described flaws in Samsung Pay's token generation and storage processes that could enable attacks like jamming MST signals, reversing encryption, or guessing future tokens. He demonstrated a tool that can jam MST signals and discussed potential social engineering attacks.