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Consider the following encryption scheme. It supports plaintexts from M = { 0 , 1 } ^ and ciphertexts from C = { 0 ,
Consider the following encryption scheme. It supports plaintexts from M and ciphertexts from C Its keyspace is:
K : in k contains exactly lambda characters k lambda
To encrypt plaintext m under key k we "fill in the characters in k using the bits of m
CHAPTER THE BASICS OF PROVABLE SECURITY
Show that the scheme does not have onetime secrecy by constructing a program that distinguishes the two relevant libraries from the onetime secrecy definition.
Example: Below is an example encryption of m
k m Enck m
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