The service automatically encrypts all transactions using secure sockets layer (SSL) protocol technology with 128-bit encryption. PayPal also performs server checks to ensure customers are using an approved browser (supporting SSL 3.0 or higher) for web-based transactions.
PayPal’s website is secure and encrypted. As long as you have a secure connection to the legitimate PayPal site, any information you exchange is hidden from prying eyes. PayPal uses industry-standard security features that you’d expect from any large financial institution