Caesar's Revenge

Mike_Sanders

Hello everyone, long time lurker, 1st time poster.

Here's one for the analog folk... If the image below appeals to your sensibilities, then the article below that may as well.

Lots of nerdy details... Enjoy the brainfood.

 Caesar's Revenge

 AT A GLANCE

 . Pencil & paper cipher requires no computer

 . Auto encrypting/decrypting (no password needed)

 . Great for masking text in hand-written notes

 SYNOPSES

 Concerning Julius Caesar's military communications, Roman historian Suetonius
 wrote: "If he had anything confidential to say, he wrote it in cipher, and by
 so  changing  the  order  of the letters of the alphabet, not a word could be
 made out."

 Caesar's Revenge is an enhanced variant of the Caesar cipher [i] that, unlike
 its  predecessor, understands both digits & case sensitivity [ii]. And yet to
 be  clear,  Caesar's Revenge, like as all substitution ciphers, is inherently
 light-duty  cryptography  [iii/iv].  It  certainly wouldn't withstand a brute
 force attack by endless banks of quantum-gizmos courtesy the NSA [v].  Bottom
 line?  When  used  in  accordance  with its intended purpose of masking text,
 Caesar's  Revenge  nevertheless  provides very good utility. Read on for more
 information...

 EXAMPLE

 Here,  we'll  begin  moving  quickly,  if  you come across unfamiliar jargon,
 simply  study  the  terms  defined  in the glossary section of this document.
 Ready? Righty then, lets do this...

 1/3 Choose a permutation from the permutations section...

     0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

 2/3 Create a tableau by splitting the permutation equally into two parts,
     each on its own line...

     0123456789ABCDEFGHIJKLMNOPQRSTU
     VWXYZabcdefghijklmnopqrstuvwxyz

 3/3 Encode/decode as needed by locating each character & converting to its
     opposite row in the same column...

     0123456789ABCDEFGHIJKLMNOPQRSTU
     VWXYZabcdefghijklmnopqrstuvwxyz

     plaintext:  Snowbear42
     ciphertext: xIJR695MZX

     Boom! You're done.

 CAVEATS

 . Group text into blocks to further disguise meaning...

   yellow submarine  yello
                     wsubm
                     arine

 . Your tableau is a key, keep it private. Store it in your wallet, or better
   yet, convert the permutation to mnemonic [vi] notation like so...

   mnemonic:   09AZaz
   expands to: 0 to 9, A to Z, a to z


 PERMUTATIONS

 Here's a brief list of permutations & millions more are possible [vii].

 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
 123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0
 23456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01
 3456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz012
 456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123
 56789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234
 6789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz012345
 789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
 89ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
 9ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz012345678
 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
 BCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789A
 CDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789AB
 DEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABC
 EFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCD
 FGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDE
 GHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEF
 HIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFG
 IJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGH
 JKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHI
 KLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJ
 LMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJK
 MNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKL
 NOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLM
 OPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMN
 PQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNO
 QRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOP
 RSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQ
 STUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQR
 TUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRS
 UVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRST
 VWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTU
 WXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUV
 XYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVW
 YZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWX
 Zabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXY
 abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
 bcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZa
 cdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZab
 defghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabc
 efghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcd
 fghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcde
 ghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdef
 hijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefg
 ijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefgh
 jklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghi
 klmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghij
 lmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijk
 mnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijkl
 nopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklm
 opqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn
 pqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmno
 qrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnop
 rstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopq
 stuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqr
 tuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrs
 uvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrst
 vwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstu
 wxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv
 xyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvw
 yz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwx
 z0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxy

 NOTES

 i.   https://en.wikipedia.org/wiki/Caesar_cipher

 ii.  The classic Roman alphabet contained only 20 letters A to X. It was not
      until late antiquity that lowercase letters came into use.

 iii. "Cryptography" is a compound word derived from Greek meaning
       hidden/"cryptic" writing/"graph".

 iv.  Substitution cipher's are still very much in use on social media to mask
      spoilers & adult humor, etc.

 v.   https://en.wikipedia.org/wiki/National_Security_Agency

 vi.  https://en.wikipedia.org/wiki/Mnemonic

 vii. Randomize & reverse (but never add, delete, or duplicate) characters
      within a permutation for even greater obfuscation.

 GLOSSARY

 cipher:      a method used to render text unreadable

 plaintext:   readable unmasked text

 ciphertext:  unreadable masked text

 tableau:     block of text used to encrypt/decrypt text

 permutation: unique re-combinations characters, xyz, yzx, zxy, etc.

 uppercase:   larger letters always CAPITALIZED, ABC

 lowercase:   smaller letters never capitalized, abc

 row:         characters depicted horizontally,  ROW

 column:      characters depicted vertically,    C
                                                 O
                                                 L
                                                 U
                                                 M
                                                 N

 LEGALESE

 [c]2022 Michael S. Sanders, Pampa, TX, USA. All rights reserved.

 COLOPHON

 1JMF C5M8 5I8 H5F9 TJPM HJOC9M KMJP8

ctietze

(Bumping because this was in the moderation queue and now sank to the bottom)

pro2type

Very usefull. Thanks.

Mike_Sanders

Thanks. Admittedly a bit of a long read, but handy in certain contexts... This paper was a 1st draft. Hoping to release an expanded & more plainly written revision to this forum soon.