![]() There are two kind of serial readers: those that send the UID once when a chip is presented, and those that send the UID repeatedly as long as the chip is in the RF field. For the purpose of logging in and unlocking screensavers with my implants on my computers in low-security environments, they’re good enough too. Usually that’s good enough for cheesy unencrypted UID-based authentication (think door reader), and that’s why there are so many of these things on the market. You can’t use them to do anything smarter. Serial readers are “dumb” in the sense that, unlike PC/SC or CCID readers, they only report the UIDs of whatever chip they happen to be able to read. I figured this might be of interested to some of you also. As a have a few RS232 and Wiegand readers on order and I intend to use them to log into my personal and work computers (login, screensaver unlocking and general PAM authentication under Linux), I decided to prepare my machines to handle those readers. ![]()
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