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tessa70
19.03.2020 •
Computers and Technology
Suppose that you want to encrypt a single message M ∈ {0, 1, 2} using a random shared key K ∈ {0, 1, 2}. Suppose you do this by representing K and M using two bits (00, 01, or 10), and then XORing the two representations. Does this seem like a good protocol to you?
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Ответ:
Encrypt a single message M ∈ {0, 1, 2} using a random shared key K ∈ {0, 1, 2}. No, this protocol does not seem good.
Explanation:
No, this scheme does not have the security guarantees of a one-time pad. The table below lists the resulting encrypted messages using this scheme. We can see that some outcomes exclude certain inputs.
For example, given E(K,M) = 11 an attacker knows that the sent message M is not 0.
K M E(K,M)
00 00 00
01 00 01
10 00 10
00 01 01
01 01 00
10 01 11
00 10 10
01 10 11
10 10 00
Ответ:
No Thank You! But Have A Great Day! :)
Explanation: None