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<div id="searchable"><h1 id="SiemensCardOSM4">Siemens CardOS M4</h1>
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Siemens CardOS M4 smart card should work fine with OpenSC.
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Supported smart cards are the <a class="wiki" href="AladdinEtokenPro.html" shape="rect">Aladdin eToken PRO</a> and the <a class="wiki" href="CryptoIdentityItsec.html" shape="rect">Eutron ITSEC-I</a> USB tokens.
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Currently only the <a class="wiki" href="AladdinEtokenPro.html" shape="rect">Aladdin eToken PRO</a> is tested often (a usb crypto dongle that contains a card with this operating system). It works fine, so all other smart cards with the same card operating system should work fine, too.
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Siemens CardOS M4 does not allow a key to be used for signing and decryption. OpenSC has a workaround for this restriction, you can generate or store a private key with the "--split-key" flag which will store the key twice, with different usage options, but hide this detail.
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Some documentation is available from Aladdin for their eToken PRO, but for an in-depth documentation you need the Siemens card manual, which requires signing an NDA.
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The versions of CardOS M4 are: M4.0, M4.01, M4.2, M4.3, M4.3b, M4.2b in this order. Yes, M4.2b is the latest and greatest and later than M4.3 and M4.3B.
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Also note that M4.0 needs special "packages" (i.e. signed firmware addons by siemens) installed to work properly. Best not to use that ancient version
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