Question: 1- what risks do bitcoin users face ? 2-what is nonrepudiation and why is it an important dimension of e-commerce security ? what technologies are

1- what risks do bitcoin users face ?
2-what is nonrepudiation and why is it an important dimension of e-commerce security ? what technologies are used to establish nonrepudiation ?
3-why are security issues associated with the internet of things even more challenging than existing security issues related to the internet ?

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