Class: Key::VICKey

Inherits:
Key
  • Object
show all
Includes:
Crypto
Defined in:
lib/key/vickey.rb

Overview

VICKey

The VIC cipher is described on the following Wikipedia page: en.wikipedia.org/wiki/VIC_cipher

and a working example is here: www.hypermaths.org/quadibloc/crypto/pp1324.htm

XXX Most of the arrays' content is 1-based mod 10 data (i.e. 0 == 10 and 1 is the lowest)

This uses a very complex key schedule as the basis of a straddling checkerboard.

Step1 uses Crypto.expand5to10 Step2 uses Crypto.chainadd on phrase (after conversion) Step3 uses the previously calculated data by running it 5 times through the Crypto.chainadd method. The key thus calculated is then converted through a transposition.

Constant Summary

Constant Summary

Constants included from Crypto

Crypto::BASE

Instance Attribute Summary (collapse)

Attributes inherited from Key

#key

Instance Method Summary (collapse)

Methods included from Crypto

#addmod10, #chainadd, #expand5to10, #find_hole, #keyshuffle, #normalize, #p1_encode, #str_to_numeric, #submod10

Methods inherited from Key

#condensed, #length, #to_s

Constructor Details

- (VICKey) initialize(ikey, phrase, imsg)

initialize



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# File 'lib/key/vickey.rb', line 41

def initialize(ikey, phrase, imsg)
  #
  # First phase
  #
  @ikey5 = str_to_numeric(ikey[0..4])
  @imsg = str_to_numeric(imsg)
  res = submod10(@imsg, @ikey5)
  @first = expand5to10(res)
  #
  # Second phase: we take the long numeric keys in two parts but we *must*
  # use normalize because String#to_numeric uses 0-based arrays) XXX
  #
  # We split the key phrase into two 10 digits parts @p1 & @p2
  # Then we add mod 10 @p1 and the first expanded ikey (as @first)
  #
  @p1 = normalize(phrase[0..9].to_numeric)
  @p2 = normalize(phrase[10..19].to_numeric)
  tmp = addmod10(@first, @p1)
  @second = p1_encode(tmp, @p2)
  #
  # Third phase
  #
  # We run 5 times through chainadd
  #
  r = @second.dup
  5.times do
    r = chainadd(r)
  end
  @third = r
  @sc_key = @third.join.to_numeric
end

Instance Attribute Details

- (Object) first (readonly)

Returns the value of attribute first



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# File 'lib/key/vickey.rb', line 37

def first
  @first
end

- (Object) ikey5 (readonly)

Returns the value of attribute ikey5



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# File 'lib/key/vickey.rb', line 37

def ikey5
  @ikey5
end

- (Object) p1 (readonly)

Returns the value of attribute p1



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# File 'lib/key/vickey.rb', line 37

def p1
  @p1
end

- (Object) p2 (readonly)

Returns the value of attribute p2



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# File 'lib/key/vickey.rb', line 37

def p2
  @p2
end

- (Object) sc_key (readonly)

Returns the value of attribute sc_key



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# File 'lib/key/vickey.rb', line 37

def sc_key
  @sc_key
end

- (Object) second (readonly)

Returns the value of attribute second



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# File 'lib/key/vickey.rb', line 37

def second
  @second
end

- (Object) third (readonly)

Returns the value of attribute third



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# File 'lib/key/vickey.rb', line 37

def third
  @third
end