For the given plaintext: [ 42, 24, 424, 224, 421, 321]
The ciphertext is: [1239,1263,1495,1349,208,1878]
Which when decrypted is: [42,690,424,779,421,321]
This is the problem. Why is it happening?
These values are used to produce the keys (The method call is at the end of the program)
p = 51
q = 37
e = 223
n = 1887
phiN = 1800 (coprime with d)
d = 1687
class RSA #edited to be concise, such as omitting initialize() def encrypt(plainText) index = 0 puts 'encrypt in is ', plainText plainText.each do |i| plainText[index] = ((i**(@e)) % @n ) index+=1 end puts 'ciphertext is ' puts plainText return plainText end def decrypt(cipherText) puts 'decrypt in is ', cipherText index = 0 cipherText.each do |i| cipherText[index] = ((i**(@d)) % @n ) index+=1 end puts 'plaintext is ' puts cipherText return cipherText end def calcD() @d=1 begin s = (@d*@e)% @phiN; @d+=1 end while not s==1 @d -= 1 #puts 'd is ', @d end end # class message = RSA.new(51,37,223,[ 42, 24, 424, 224, 421, 321])
In the past I have been pointed here as a better place to ask cryptography related questions than just the general language forums. If this is the wrong place, please feel free to move it.