One-time pad (OTP) cryptography works by randomly generating a private key for a single encrypted communication between two users. Since the key is randomly generated and used only once, there is no possibility for an eavesdropper to discern a pattern by analyzing multiple communications between a same sender and receiver. True OTP is "computationally secure," meaning that in theory it is unconditionally secure. But in practice, pure OTP is impossible since humans are involved in an OTP key exchange process and we inevitably introduce the possibility of a compromised exchange, even if great precaution is taken. For this reason, the cryptography community will always disclaim any purported OTP implementation, though it is in fact possible to achieve very high degrees of OTP integrity. KellyCrypto focuses on OTP key exchange solutions that minimize the possibility of eavesdropping, even on physical devices.

Hash Message Authentication Code (HMAC) is a means of verifying that data hasn't been tampered with on its way from a sender to a receiver. HMAC is not a method for ensuring privacy, but is useful for detecting man-in-the-middle activity that might otherwise compromise or redirect an encrypted communication.