Multiple encipherment of single-length keys

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Definition of the multiple encipherment of a single-length key (K) using a double-length *KEK.

The multiple encipherment of a single-length key (K) using a double-length *KEK is defined as follows: 
   e*KEK(K) = eKEKL(dKEKR(eKEKL(K)))
where KEKL is the left 64 bits of *KEK and KEKR is the right 64 bits of *KEK.

Figure 1 illustrates the definition.

Figure 1. Multiple encipherment of single-length keys
Multiple encipherment of single-length keys