It is the encryption method I used for coding the keyword on Day 1, which can be found here.

The final table for that was

A = 4310
B = 28664
C = 166149
D = 29175
E = 29562
F = 95460
G = 11832
H = 30953
I = 13523
J = 32018
K = 15134
L = 60285
M = 15924
N = 16240
O = 98398
P = 34965
Q = 119918
R = 19170
S = 19726
T = 20520
U = 21363
V = 37479
W = 163142
X = 142433
Y = 23865
Z = 122651

So, starting with "F1B2D1C1D2D1F2F2U2Y1R2P1A1F1I2N2K2"

Looking at the table, the first character, F, becomes 95460.

Then we have the number 1, which, as with all of the other coding methods, remains as 1.

Thus, my encoded message begins 954601.

F1 is followed by B2, so looking at the table again, we see that B becomes 28664. As was the case with 1, 2 remains 2.

Thus, my enconded message begins 954601286642.

And so on.

As for having shorter ciphers in the future... we'll see. As you will recall, I was against this from the beginning, and I didn't want to make it easy on anyone. I had no intentions of ever actually claiming anyway, but we all saw how that turned out.

Also, I may have an ulterior motive for using codes of increasing complexity that will culminate in a devious scheme in some future game.

Or then again, I may not.