How to perform a Franklin Reiter Related Message Attack on RSA?

Issue

This Content is from Stack Overflow. Question asked by Zeyan Wang

By definition, the Franklin Reiter related message attack works in a scenario where two messages differ only by a fixed known difference. Suppose I have two messages encrypted by RSA with the same public key (N, e), where:

M1 = “Hello ” + name1 + message

M2 = “Hello ” + name2 + message

How can I perform the Franklin-Reiter related message attack on them?

I am aware that we need (N, e, C1, C2, f) for a Franklin Reiter related message attack where f = ax + b, but what is f in this case?



Solution

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