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Arabic Cipher

Fereydoon_Shekofte 223 Maple 18
September 15 2019
3

This is a simple encryption method to hide text messages

Mentioned in Arabic manuscrips with more than hundreds years old ...

PRINCIPLE :

Just the place of letters in the sentence rearranged as described below :

For example "ABCDE" we pick up the First letter "A" from the left and write it as the last letter in the Right "......A"

but this time we pick up the letter "E" as the last letter from Right and place it at the Left Side of the previous one  ".....EA"

and this cycle continue until for rest letters ... "CDBEA" .

by this way the text become hard to discover !

It is Amazing that for decoding this message you should repeat the same rearrangment algorithm several times until the readable text appears as the first "ABCDE"

EXample :

"AlbertEinstein"

"iEntsrteebilnA"

"eterbsitlnnEAi"

 "tilsnbnrEeAtie"

"rnEbenAstliiet"

"sAtnleibiEentr"

 "biieElennttArs"

"nenltEteAirisb"

"etAEitrlinsebn"

"lritnisEeAbtne"

"EseiAnbttinrel"

"tbtniAnireeslE"

"inrAeienstlbEt"

"nesitelAbrEnti"

"AlbertEinstein"

the same text appeared after 14 step cycle


 

Arabic Cipher

 
> 

ArabicCipher := proc (x) options operator, arrow; StringTools[Permute](x, [seq(1+iquo(StringTools[Length](x), 2)+((1/2)*i+(1/2)*irem(i, 2))*(-1)^(i+irem(StringTools[Length](x), 2)), i = 0 .. StringTools[Length](x)-1)]) end proc

proc (x) options operator, arrow; StringTools[Permute](x, [seq(1+iquo(StringTools[Length](x), 2)+((1/2)*i+(1/2)*irem(i, 2))*(-1)^(i+irem(StringTools[Length](x), 2)), i = 0 .. StringTools[Length](x)-1)]) end proc

 (1.1)
> 

seq((ArabicCipher@@i)("AlbertEinstein"), i = 1 .. 14)

"iEntsrteebilnA", "eterbsitlnnEAi", "tilsnbnrEeAtie", "rnEbenAstliiet", "sAtnleibiEentr", "biieElennttArs", "nenltEteAirisb", "etAEitrlinsebn", "lritnisEeAbtne", "EseiAnbttinrel", "tbtniAnireeslE", "inrAeienstlbEt", "nesitelAbrEnti", "AlbertEinstein"

 (1.2)
> 

NULL

> 

seq((ArabicCipher@@i)("FereydoonShekofte"), i = 1 .. 12)

"nSohoedkyoefrteeF", "yokedferotheoeSFn", "otrheefodeeSkFony", "deoefSekeFhorntyo", "eFkheoSrfnetoyeod", "fnreStooeyhekoFde", "eyohoetkSoeFrdnef", "SoketFerodhnoeyfe", "odrhenFoteeykfoeS", "teoeFynkefhoredSo", "efkhnoyrFeedoSeot", "FereydoonShekofte"

 (1.3)
> 

``


 

Download Arabic_Cipher.mw

 

 
stringtools encryption

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