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- Q4036726 subject Q7974501.
- Q4036726 abstract "Crypto1 is a proprietary encryption algorithm created by NXP Semiconductors specifically for Mifare RFID tags, including Oyster card, CharlieCard and OV-chipkaart.Recent cryptographic research has shown that, "the security of this cipher is ... close to zero".Crypto1 is a stream cipher very similar in its structure to its successor, Hitag2. Crypto1 consists of one 48-bit feedback shift register for the main secret state of the cipher, a linear function, a two-layer 20-to-1 nonlinear function and a 16-bit LFSR which is used during the authentication phase (which also serves as the pseudo random number generator on some card implementations).It can operate as an NLFSR and as an LFSR, depending on its input parameters. Outputs of one or both linear and nonlinear functions can be fed back into the cipher state or used as its output filters. The usual operation of Crypto1 and Hitag2 ciphers uses nonlinear feedback only during the initialization/authentication stage, switching to operation as LFSR with a nonlinear output filter for encrypting the tag's communications in both directions.".
- Q4036726 thumbnail Crypto1.png?width=300.
- Q4036726 wikiPageExternalLink Security_Flaw_in_MIFARE_Classic.pdf.
- Q4036726 wikiPageExternalLink crapto1.
- Q4036726 wikiPageExternalLink MF1_S501_Data_Sheet.pdf.
- Q4036726 wikiPageExternalLink SAR-PR-2008-21_.pdf.
- Q4036726 wikiPageExternalLink downloads.html.
- Q4036726 wikiPageWikiLink Q104954.
- Q4036726 wikiPageWikiLink Q1155668.
- Q4036726 wikiPageWikiLink Q1405976.
- Q4036726 wikiPageWikiLink Q141090.
- Q4036726 wikiPageWikiLink Q1623338.
- Q4036726 wikiPageWikiLink Q249400.
- Q4036726 wikiPageWikiLink Q2550595.
- Q4036726 wikiPageWikiLink Q2960813.
- Q4036726 wikiPageWikiLink Q681101.
- Q4036726 wikiPageWikiLink Q6954640.
- Q4036726 wikiPageWikiLink Q7974501.
- Q4036726 wikiPageWikiLink Q864718.
- Q4036726 comment "Crypto1 is a proprietary encryption algorithm created by NXP Semiconductors specifically for Mifare RFID tags, including Oyster card, CharlieCard and OV-chipkaart.Recent cryptographic research has shown that, "the security of this cipher is ... close to zero".Crypto1 is a stream cipher very similar in its structure to its successor, Hitag2.".
- Q4036726 label "Crypto-1".
- Q4036726 depiction Crypto1.png.