Playfair Cipher

On the Subject of Playfair Cipher

Encrypting secrets since 1854, exploding bombs since 2018.

Timezone:

Screen Color: lit BOB

AA = 2(B - H)

D = 2H - B

D > AA = B < H + ⅓H

Part 1
Sun	BECOZY
Mon*	PLAYHIDDEN
Tue	HIDDEN
Wed*	SECRETCIPHER
Thu	CIPHER
Fri*	FAILPARTYHARD
Sat	PARTYHARD

	Magenta	Blue	Orange	Yellow
	Part 2
SER and PAR	SAFE	EFAS	MESSAGE	GROOVE
S# sum > 10	CODE	EDOC	QUIET	ETIUQ
D > AA	GROOVE	EVOORG	TEIUQ	QUITE
else	MESSAGE	EGASSEM	SAFE	EDOC

“SER” is a serial port. “PAR” is a parallel port.
“S# sum” is the sum of all digits in the serial number.
“D” is the # of D batteries. “AA” is the # of AA batteries.

Part 3
0 Xs
1 Xs	ONE
2 Xs	TWO
3+ Xs	MANY

*If lit BOB exists, use the next day instead.
If no vowel in S#, swap parts 1 & 2.
Now add all parts together to make a full key.
Reverse the full key if S# sum is prime.

Primes
2	3	5	7	11	13	17	19
23	29	31	37	41	43	47	53

			Magenta	Blue	Orange	Yellow
			Result Sequence
ST	RI	KE	ABCD	CDAB	BADC	DABC
	RI	KX	BCDA	DACB	ADCB	ABCD
	RY	KE	CDAB	ACBD	DCBA	BCDA
	RY	KX	DABC	CBDA	CBAD	CDAB
ZT	RI	KE	ABDC	BDAC	BACD	DACB
	RI	KX	BDCA	DBCA	ACDB	ACBD
	RY	KE	CABD	BCAD	CDBA	CBDA
	RY	KX	DCAB	CADB	DBAC	BDAC

For each pair in grid:
Same Row -> Shift Left Same Column -> Shift Up
Otherwise -> Same Row, Column of Other