28082

3-digit-substitution

Each one of the existing 625 3-digit-groups represents a 2-letter-group (b1, b2) according to the rule:

b1 * 25 + b2 = (3-digit-group)

b1-Alphabet:

VAKWIBMXOCNYLDPZEFQTGRSHU
0123456789101112131415161718192021222324

b2-Alphabet:
EFQIBMXLDPZOCNYSHUTGRVAKW
12345678910111213141516171819202122232425

The alphabets are constructed the following way:

1234567b1-Alphabet
7243165b2-Alphabet

VIOLETS
ABCDFGH
KMNPQRU
WXYZ

Example:

AR = 1 * 25 + 21 = 046
ST = 22 * 25 + 19 = 569

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© Karlheinz Everts