Challenge Response

Evochallenge is a simple Perl-based challenge/response mail filter for Evolution on Linux. How it Works: Challenge/response e-mail filters only pass e-mail through if the sender is on a "whitelist". E-mail from anyone not on the whitelist goes to a holding area. The sender is then challenged... Platforms: *nix

Net::YahooMessenger::CRAM is a Yahoo Messenger Challenge-Response Authentication Mechanism. SYNOPSIS my $cram = Net::YahooMessenger::CRAM->new(); $cram->set_id($your_yahoo_id); $cram->set_password($your_password); $cram->set_challenge_string($string_from_server); my ($response_type6,... Platforms: *nix

Sporkie is a challenge/response spam email filter. Sporkie project uses CAPTCHAs (randomly generated, distorted images of numbers) in order to verify that a person sending email is human. It works in the same manner as the ASK project, except that Sporkie uses CAPTCHAs. The main advantage to... Platforms: *nix

Net::YMSG::CRAM is a Yahoo Messenger Challenge-Response Authentication Mechanism. SYNOPSIS my $cram = Net::YMSG::CRAM->new(); $cram->set_id($your_yahoo_id); $cram->set_password($your_password); $cram->set_challenge_string($string_from_server); my ($response_type6, $response_type96) =... Platforms: *nix

pam_smxs is a PAM module that authenticates a user using challenge-response. All tokens that support ANSI X9.9 are currently supported and it provides full support for CryptoCard RB1 tokens. Platforms: *nix

Zaep AntiSpam eliminates 100% of the spam you receive without the added hassle of other anti-spam solutions. It doesn't require training to recognize a spam message. It doesn't require that you review its results for any mistakes. It eliminates spam and lets you enjoy receiving new email... Platforms: Windows

Spamresponder provides a simple and radical spam filter using DNS validation and challenge/response. Spamresponder is a very simple and radical spam filter, combining DNS validation with the challenge/response approach. It will go through all mail messages in /var/mail/$USER, looking for... Platforms: *nix

SpamWars- 100% efficient anti-spam protection, with no loss of bona fide mail, thanks to a verification method of the relation between you and your e-mail contacts. This technique, called Challenge - Response, not only works for traditional e-mails but also for automated replies, newsletters or... Platforms: Windows, Mac, Unix, Linux, Java

The 100% solution to the problem - Spam and e-mail viruses -. XToMe is the solution in a business and home environment for the problem unsolicited e-mail. It goes beyond the known and in accurate spamfilter technology. XToMe employs the challenge response system (CRS) It’s a handshake protocol... Platforms: Windows, Other

Xtrawise Anti-Spam Filter for Windows supports all standard POP3 email clients without any configuration including Outlook, Outlook Express, Netscape Mail, Opera, Eudora and Pegasus Mail. Includes challenge/response authentication, Trojan and Virus protection. Options allow 100% Spam blocking.... Platforms: Windows

Deerfield.com's VisNetic MailPermit represents a comprehensive new approach to spam prevention, combining SpamAssasin's™ advanced rules-based and Bayesian filtering technology with a proprietary challenge-response system to create a powerful barrier between your business and costly,... Platforms: Windows

Death2Spam is a true Bayesian E-mail filter. Featuring advanced heuristics and adaptive technology, D2S is available as a proxy service or as a local install. As a server-based solution, there is nothing to install on any client machine. It is 95% accurate out-of-the-box and can exceed 99% after... Platforms: Windows, *nix

Espresso permissions-based email client completely eliminates spam as you define it from your Inbox. Espresso's powerful email filter is based on a sophisticated challenge-response system. All messages from approved and trusted senders are immediately accepted. With a selection of options... Platforms: Windows

MailBox Sentry" is "The Swiss army knife " among anti-spam systems. Whether you prefer all-round defense or you are in correspondence with many addressees, if you receive a few spam messages or a lot of spam - everyone can find to himself the tool on taste... "The big brother keeps up with you":... Platforms: Windows

SpamKO anti spam software actually learns what messages you want with its exclusive Bayesian filter. Spam KO allows you to customize the features around your needs. Also, the challenge-response system is 100% effective so you will never get unwanted email again. Individualize your email accounts... Platforms: Windows

SpamScreener helps you easily and accurately block spam, and enjoy a productive emailing experience. Unlike other spam blockers that use traditional filtering techniques which are not entirely accurate, SpamScreener utilizes an advanced challenge/response technology that provides virtually 100%... Platforms: Windows

Privacy.ACCESS provides additional security to your logon by providing a NT logon environment and offering smart cards as a highly secure method to unlocking your credentials and logging onto your computer.With Privacy.ACCESS the end-user may never need to know their logon credential, only their... Platforms: Windows

SyncServer - Maintain a copy of files on another server, handy for load-sharing servers, or to have a secondary server standing by to take over in case of a crash. This utility makes an exact replica of files on a machine via the network to another machine. It was designed for load-sharing... Platforms: Windows

Email Angel is your final solution to stopping spam. It uses a unique Challenge-Response system that spam servers simply cannot pass. Unlike other anti-spam solutions, Email Angel quickly and effectively blocks spam before it ever gets to your inbox S no matter how the spam is disguised or where... Platforms: Windows

VanMail is a powerful POP3/SMTP email client that allows you to manage your email with ease. With VanMail's powerful built-in SPAM protection, you control the emails you want to receive. VanMail comes with a powerful rules based system where you can create rules to block emails, whitelist rules... Platforms: Windows