If I may suggest some others:

Rumkin.com Cypher Tools
http://rumkin.com/tools/cipher/

Practical Cryptography
http://practicalcryptography.com/

Secret Code Breaker
http://www.secretcodebreaker.com/

English letter frequency study
http://norvig.com/mayzner.html

quipqiup automated cryptogram solver
http://www.quipqiup.com/

Cryptool Portal (related to CrypTool-Online)
https://www.cryptool.org/en/

I decided to combine two topics into one thread, as they are related to each other and there are a lot of threads on this site.

The additional topic is new ideas for ciphers. Sometimes when I research different cipher types or work on the 340, I get ideas for variations of common ciphers or even new ciphers. Besides links to cryptography websites, this thread is also for people to record and share their new cipher ideas.

I am a big fan of simplicity, and like the idea of using a keyword. I was thinking of a very simple way to incorporate the use of a keyword into a route transposition cipher. And I was also thinking that it must be fast, simple and easy to use.

Here is a variation of a simple military route transposition that uses a keyword:

1. Start with a polybius square.
2. Black out the keyword letters.
3. Delete the letters that are not blacked out to create the unique inscription square.
4. Inscribe a message chunk ( shown left right, top bottom ).
5. Transcribe ( shown top bottom left right ).

EDIT:

For diffusion and polyalphabetism:

6. Write the keyword into the Polybius square, omitting repeating letters.
7. Fill in the rest of the square with the letters that aren’t blacked out above.
8. Use a simple variation of Playfair, where if two letters are in the same column or row, just reverse them.

Yesterday I stumbled upon an excellent resource for classical cryptography that represents a great deal of work. It appears to be the text for a college class, and is very comprehensive. Anyone interested in classical cryptography should take a look.

http://www.ahazu.com/papers/lanaki/

Hello Mr Smoke Treats

Here are some ideas, silly, but I take this topic to share with everyone. Sorry me if this seems silly.

EBEORIETEMETHHPITI
515113533153221333

"Keys"

EAEAACECCAECBBACCC

or inverse

CCCABBCEACCECAAEAE

individual

EBORITMHP
511133121

EAACCCABA

or inverse

ABACCCAAE

Marcelo

One cannot help but admire the persistence of cryptographers in attempting to solve the Zodiac ciphers. However, I question whether there are actually messages hidden in the gibberish. I mean, the attempts of so many intelligent individuals have come to naught here. Further, Zodiac’s perverse sense of humor might have generated a fraud designed to mess with the minds of investigators. To the chase: is there evidence that the ciphers in question do, actually, contain messages?

The answer to your question is yes. There are several statistical observations suggesting that there is a true message, but that is about all I know.

The Copiale cipher was solved after 250 years. It is not like a group of morons searching for "fool’s gold."

http://www.wired.com/2012/11/ff-the-manuscript/

-glurk