The OTPWCalc Project

The OTPWCalc project consists of software using standard web technology to deliver a handy, RFC compliant, one time password (OTP) challenge response calculator client. A typical use case for this software involves receiving a challenge token when attempting to log in to a authenticating system, typing the challenge into the calculator, reading the response, and using it to complete the log in procedure.


Michael Schloh von Bennewitz is a computer scientist and the author of a number of software titles. Specializing in network and user interface software design, his contributions have lead to improvements in security and stability of the communications systems of network providers and software vendors.


For support of this software title, please review the documents where related information may be found. To receive a personal answer, please post a clear and detailed question to the mailing list.


General security concerns should be directed to the mailing list, while those of a private nature should be sent directly to the author. X.509 certificates (for exchanging S/MIME encrypted email) and GnuPG keys (to verify released software signatures) reside on the author's website.