In this paper, a multiple key agreement scheme is presented which is identity-based and uses the challenge-response
method to verify the identities of the two sides of the protocol.
The authentication protocol which we propose in this section is based on a challenge-response
authentication protocol like CRAMMD5  which uses a cryptographic hash function.
The Web server then calls to a standard RADIUS server, which computes the same challenge-response
value; if the two match, then the user's identity is authenticated.
is a method of filtering spam whereby all senders are blocked by default.
feature supports both the YubiKey OTP algorithm, as well as standard HMAC-SHA1.
The ICard is available as a challenge-response
authentication card, and can be used with either a web or software interface.
Using a CAPTCHA challenge-response
, users are required to enter a unique id before sending each text message.
Spam Arrest LLC is a Seattle-based company that protects its members' inboxes from unwanted communications, utilizing its patented challenge-response
Other functionalities of Digipass include e-signatures, host authentication, challenge-response
New, patent-pending security features supporting Akonix's 360-Degree Security for Real-Time Communications(TM) include a unique challenge-response
system for ensuring that 'poisoned Web addresses' cannot be sent through instant messenger systems.
- protects against social engineering attacks and 'URL poisoning', the hiding of a live and dangerous hyperlink behind what appears to be a legitimate URL.
Reviewing all options available, we found that VASCO's Digipass product has a combination of unique features - including Web site authentication, challenge-response
and digital signatures - that will provide our clients with high levels of security.