Hi,

certificate chain verification is always done until a self-signed
CA certificate (root CA certificate), even if intermediate sub-CA
certificates are locally known (which equals trusted) - but why?
Is there some cryptographic requirement for this?

  (I understood that a root-CA certificate must be self-signed
   (instead of having no signature at all) to avoid that a
   man-in-the-middle could modify cerificates properties -
   however, the local filesystem must be safe for such
   manipulations anyway).

Please note that someone may trust (in means of authentication
for the appropriate purpose) the root CA but not all of their sub
CAs, for instance, when there is a high level policy and a medium
level policy.

oki,

Steffen
 
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About Ingenico Throughout the world businesses rely on Ingenico for secure and 
expedient electronic transaction acceptance. Ingenico products leverage proven 
technology, established standards and unparalleled ergonomics to provide 
optimal reliability, versatility and usability. This comprehensive range of 
products is complemented by a global array of services and partnerships, 
enabling businesses in a number of vertical sectors to accept transactions 
anywhere their business takes them.
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