converting number to string in matlab

Question

is there a way to convert numbers to str in matlab

for example, 30120 turns into cat

where c is 03 a is 01 t is 20

here is my progress on RSA encryption/decryption I am trying to decrypt into plain text.

% variables

p=vpi('22953686867719691230002707821868552601124472329079')
q=vpi('30762542250301270692051460539586166927291732754961')
e=vpi('555799999999999');
n=(p.*q)
phi=((q-1).*(p-1))

% how to convert plaintext to integer mod 26


abc = 'abcdefghijklmnopqrstuvwxyz';
word = 'acryptographicallystrongrandomnumbergeneratorwhichhasbeenproperlyseededwithadequateentropymustbeusedtogeneratetheprimespandqananalysiscomparingmillionsofpublickeysgatheredfromtheinternetwasrecentlycarriedoutbylenstrahughesaugierboskleinjungandwachteracryptographicallystrongrandomnumbergeneratorwhichhasbeenproperlyseededwithadequateentropymustbeused';  

[temp1, temp2, temp3, temp4, temp5, temp6, temp7,temp8,temp9] = split(word)

[int1,int2,int3,int4,int5,int6,int7,int8,int9] = intsplit(temp1,temp2,temp3,temp4,temp5,temp6,temp7,temp8,temp9)

[encrypt1, encrypt2, encrypt3, encrypt4, encrypt5, encrypt6, encrypt7, encrypt8, encrypt9] = encrypt_this(int1, int2, int3, int4, int5, int6, int7, int8, int9)

[decrypt1, decryt2, decrypt3, decrypt4, decryt5, decrypt6,decrypt7, decryt8, decrypt9] = decrypt_this(encrypt1, encrypt2, encrypt3, encrypt4, encrypt5, encrypt6, encrypt7, encrypt8, encrypt9)

Junuxx · Accepted Answer · 2012-10-07 00:11:52Z

1

From 30120 to 'cat':

num = 30120;
l = ceil(numel(num2str(num))/2); % number of characters
num2 = sprintf('%06i', num);   % num in string form, with leading zero if needed
                               % '030120'
str = '';
for i = 1:l
    str = [str char(96+str2num(num2(2*i-1:2*i)))]; 
end % 96 is the ASCII offset needed to get a=1, c=3 etc like in your example

Results in str = 'cat'. I think that's what you want.

answered Oct 7, 2012 at 0:11

Junuxx

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2 Comments

jaymeister Over a year ago

crud, so close except sprintf command cannot handle vpi numbers is there a way around this? is there a way for me to convert vpi number to a number that is compatible with sprintf command

tzelleke Over a year ago

the documentation for vpi states that you can convert it to struct and then access an array with the digit representation: s = struct(vpi_number); s.digits;

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