Recently I watched the movie 'The Prestige' again but this time the cipher diary impressed me very well. I like to create my own cipher for my diary because I have some time to kill everyday after deactivating facebook.
So If I create my own substitution table like
'Vigenère_cipher', and use a
different key for every page or every word (somehow I manage to remember the key and decipher it), Is it still possible to crack this cipher in anyway?
I read about it some articles, Crackers can detect text patterns and it is easy for them to crack if long text is ciphered using the same key, I think using different keys will reduce this kind of pattern analysis. But I am not an expert in this field, so you can tell me about the possibilities of cracking a cipher written in this way.
NOTE: I am not using this kind of thing to cipher any sensitive data, others data, I am just want to know the possibilities of this thing. I maybe in a wrong thought about all these because I'm not a expert in this field.