GLRP:EMs:Royal Spies:Trainings:Training4 Cryptography and You!
Title: Cryptography and You!
Author: James
Basic Ciphers Class:
All of the ciphers I
mention are in this book.
Substitution Ciphers -
Two-Shifted Cipher
(Simple Substitution)
Plaintext:
ABCDEFGHIJKLMNOPQRST
UVWXYZ
Ciphertext:
CDEFGHIJKLMNOPQRSTUV
WXYZAB
Sample:
"hello"
becomes
"jgnnq"
Reverse Numbers Cipher
(Simple Substitution)
Plaintext:
ABCDEFGHIJKLMNOPQRST
UVWXYZ
Ciphertext:
26-25-24-23-22-21-20-1
9-18-17-16-15-14-13-12
-11-10-9-8-7-6-5-4-3-2-1
Sample:
"hello"
becomes
"19-22-15-15-12"
Two-Shifted with Extra
Vowels Cipher (Homophonic
Substitution)
Plaintext:
ABCDEFGHIJKLMNOPQRST
UVWXYZAEIOU
Ciphertext: CDEFGHIJKLMNOPQRSTUV WXYZAB12345
Sample:
"hello"
becomes
"jgnnq" or "j2nn4" or
"jgnn4" or "j2nnq"
Transposition Ciphers -
3-Letter Columns Cipher
(Route Transposition)
Rule:
Make columns of three
letters going down. Add
extra letters at end; X
is a good letter for this.
Put columns together and
read off rows.
Sample"
"I trust Magnus"
becomes
(Grid)
iumn
tsau
rtgs
(Final)
"iumntsaurtgs"
Ciphers for Test:
Numbers Cipher (Simple
Substitution)
Plaintext:
ABCDEFGHIJKLMNOPQRST
UVWXYZ
Ciphertext:
1-2-3-4-5-6-7-8-9-10-11-
12-13-14-15-16-17-18-19-2
0-21-22-23-24-25-26
Four-Shifted Cipher
(Simple Substitution)
Plaintext:
ABCDEFGHIJKLMNOPQRST
UVWXYZ
Ciphertext:
EFGHIJKLMNOPQRSTUVW
XYZABCD
Four-box Cipher (Route
Transposition)
Rule:
Make columns of four
letters going down. Add
extra letters at end; X
is a good letter for this.
Put columns together and
read off rows.
Sample:
"Hello James"
becomes
(Grid)
HOE
EJS
LAX
LMX
(Final)
"HOEEJSLAXLMX"
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