LFSRs are notoriously insecure from a cryptographic standpoint because the structure of an n-bit LFSR can be easily deduced by observing 2n consecutive bits. Owing to the good statistical properties, large period and low implementation costs, LFSR have achieved wide acceptance in developing stream ciphers. The Linear Shift Feedback Registers have always received considerable attention in cryptography. These are extremely useful to know when trying to crack Mifare RFID cards: Manufactures pre-load Mifare cards with default keys – these can be found within their design/specification documentation, below is a list of the most common default keys. CRYPTO1 nonpublic algorithm implementation obfuscated parity information.Mutual authentication between reader and writer and encrypted communication.Sec 1 Block 3| Key A |Permissions | Key B

One of the most used RFID cards (13.56MHz), based on ISO14443 A/B standard and uses the proprietary crypto1 algorithm with 48bit keys. The organisations that tend to be vulnerable are early adopters of the technology, and in some cases departments that have a fixed limited security budget? Mifare Specification Overview

RFID is our future, and unless implemented in a secure fashion – it to can be vulnerable to attack.īelow we will walk through a valid attack methodology, including hardware and software, that can be used to subvert some RFID Access Control Systems. Our previous posting on Access Control Part 1: Magstripes Revisited, demonstrated the use and subversion of magstripe technology.

Mifare cracker