Data Protection and Security

   

VII

Identification and Entity Authentication

    

VII.III

Authentication Protocols

    
   
 

 

    

VII.III.II Q

[+] Question

[-] Question

What if the clocks Alice and Bob have are not synchronized?

    

VII.III.III Q

[+] Question

[-] Question

Unlike previous protocol, in its current form this protocol can only be implemented by an encryption algorithm and not by a one-way hash function. Why? Show a modification so that one-way hash functions can also be used.

    

VII.III.IV Q

[+] Question

[-] Question

There are also public key versions of two protocols we have seen. For instance in Figure 5, you can see a challenge response protocol based on public key signatures. There is another variant based on public key encryption. Can you draw it?

Figure 5. Challenge-Response protocol based on public key signatures.

    
   
       
 
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