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Alpha-Numeric
The Alpha-Numeric code is one of the simplest known to exist, and is general knowledge to any cipher veteran. It replaces each letter with a number, numbering the letters (in alphabetical order) in numerical order; this "A" becomes "1", "B" becomes "2", and so forth.
A 1
B 2
C 3
D 4
E 5
F 6
G 7
H 8
I 9
J 10
K 11
L 12
M 13
N 14
O 15
P 16
Q 17
R 18
S 19
T 20
U 21
V 22
W 23
X 24
Y 25
Z 26
word end /
sentence end //
Try decoding this alpha-numerically coded message:
20, 8, 5 / 17, 21, 9, 3, 11 / 2, 18, 15, 23, 14 / 6, 15, 24 / 10, 21, 13, 16, 19 / 15, 22, 5, 18 / 20, 8, 5 / 12, 1, 26, 25 / 4, 5, 7 //