Definition
Tokenization is a data security process that substitutes sensitive data with a non-sensitive equivalent, known as a token. This token has no exploitable meaning or value on its own, acting as a reference to the original data. In practice, a tokenization system replaces sensitive information like credit card numbers or social security numbers with unique tokens before they are stored or transmitted. This significantly reduces the risk of data breaches by ensuring that even if the tokenized data is compromised, the actual sensitive information remains protected. For instance, when you make an online purchase, your credit card number might be tokenized and replaced with a token that the merchant uses for processing the transaction. Tokenization is often confused with encryption, but unlike encryption which can be reversed with a key, tokenization is a one-way process where the original data is not directly recoverable from the token. This concept is crucial for understanding data protection strategies and appears on certifications like Security+, CySA+, and CISSP.