Encryption ProcedureOverview

(1) Given a 128-bit plaintext block PT, it is split into two 64-bit halves R0 and R1.

(2) Key K whose length is up to 256 bits is expanded into 1024-bit key EK, it is split into eight 128-bit strings.

(3) R0,….R9 is built by the Equation

(4) DFC encryption function is defined by

PT=R0|R1

EK= RK1|RK2|….RK8

Ri+1= RFRKi(Ri)?Ri-1

CT=DFCK(PT) = R9|R8

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