Maurice Tutor

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Category > Computer Science Posted 23 Sep 2017 My Price 6.00

symmetric encryption

An early proposal for a digital signature scheme using symmetric encryption is based on the following. To sign an -bit message, the sender randomly generates in advance 2n56-bit cryptographic keys:

k1, K1, k2, K2, . . . ,kn, Kn

which are kept private. The sender prepares in advance two sets of corresponding non-secret 64-bit validationparameters, which are made public:

u1, U1, u2, U2, . . . ,un, Un and v1, V1, v2, V2, . . . , vn, Vn

where

vi= E(ki, ui), Vi = E(ki, Ui)

The message is signed as follows. For the th bit of the message, either or isattached to the message, depending on whether the message bit is 0 or 1. For example,if the first three bits of the message are 011, then the first three keys of the signatureare  k1K2 K3.

a. How does the receiver validate the message?

b. Is the technique secure?

c. How many times can the same set of secret keys be safely used for differentmessages?

d. What, if any, practical problems does this scheme present?

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 09:09 AM My Price 6.00

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