Saturday, November 3, 2012

A Good Tool For Breaking Monoalphabetic Substitution Cipher



In Cryptography Substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext, according to a regular system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitution. A monoalphabetic cipher uses fixed substitution over the entire message.

Now if you got a monoalphabetic cipher , you can break the cipher by doing some cryptanalysis. The most common way is to use frequency analysis to check the most repeated letter and compare it with the frequency analysis table to see its equal to which letter in English language. Frequency analysis table is a table of letters that shows what is the percentage of usage of each letter in English language. by repeating this method you can break the cipher.
Another way is to do brute force attack that it might took long time to broke the cipher if you don't have access to parallel computing facilities or powerful clusters.

Or you can use "Secret Code Breaker-Monoalphabetic Substitution Solver". 
download it from: http://www.secretcodebreaker.com/SCBSolvr.zip This tool use a random key to decrypt the cipher and try again by changing  1 letter of the key then it compare the result with the old result to see which one is the better one!  You might ask yourself how this tool can understand if it find the right word or not, for this problem it use a internal dictionary that it contain 52,483 word entries; each time it find two possibilities or more , it will refer to the list of word to see which one is more accurate. 

11 comments:

  1. Great Article Cyber Security Projects projects for cse Networking Security Projects JavaScript Training in Chennai JavaScript Training in Chennai The Angular Training covers a wide range of topics including Components, Angular Directives, Angular Services, Pipes, security fundamentals, Routing, and Angular programmability. The new Angular TRaining will lay the foundation you need to specialise in Single Page Application developer. Angular Training

    ReplyDelete
  2. Great article Lot's of information to Read...Great Man Keep Posting and update to People..Thanks latest hindi news

    ReplyDelete
  3. What a sensational blog! This blog is too much amazing in all aspects. Especially, it looks awesome and the content available on it is utmost qualitative. semrush pricing

    ReplyDelete
  4. Took me time to read all the comments, but I really enjoyed the article. It proved to be Very helpful to me and I am sure to all the commenters here! It’s always nice when you can not only be informed, but also entertained! ahrefs group buy

    ReplyDelete
  5. I blog often and I truly appreciate your content.
    야설

    Feel free to visit my blog :
    야설

    ReplyDelete
  6. This great article has truly peaked my interest.
    일본야동
    Feel free to visit my blog : 일본야동

    ReplyDelete
  7. I’m going to bookmark your site and keep checking for new details about once per week.
    국산야동
    Feel free to visit my blog : 국산야동

    ReplyDelete
  8. I subscribed to your Feed too.
    일본야동
    Feel free to visit my blog : 일본야동

    ReplyDelete
  9. Hi there! This article could not be written much better!
    야설
    Feel free to visit my blog : 야설

    ReplyDelete
  10. Have you ever thought about adding a little bit more than just your articles?
    I mean, what you say is fundamental and all. Nevertheless think about if you added some great photos or video clips to give your posts more, «pop»!
    Your content is excellent but with images and video clips, this site could undeniably be one of the very best in its niche.
    Wonderful blog!오피월드


    2YOUNGYANG

    ReplyDelete

Social Networks Sharing