Security Reinforcement
Multiple encryption
Double encryption
Breakable with a meet-in-the-meddle attack in attempts.
With 2 or more known plaintext blocks.
Using 2^n blocks stored in memory.
Not secure enough (theoretically).
Triple Encryption (EDE)
Ci = Ek3 * (Dk2 * (Ek1 * Ti))
Pi = Dk1 * (Ek2 * (Dk3 * Ci))
Usually K1 = K3.
If K1 = K2 = K3, then we get simple encryption
Key Whitening (DESX or DES-X)
A simple and efficient technique to add confusion.
Ci = Ek * (K1 ⊕ Ti) ⊕ K2
Ti = K1 ⊕ Dk (K2 ⊕ Ci)
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