Homogenization of byte pattern of plain text

The realy useful cryptographic algorithm is homogenization of byte pattern of plain text, I think.

Is there any good algorithm?

There is no need to be fast. When I have a time to write texts, I have a time to encrypt it. Complete and ultimate are required. Theoretical proof that it can't be read without passwords is really necessary one.

By the way, why many Japanese researchers of cryptography is so ugly? As an Japanese, I can't have motivation to read many specifications of block ciphers. There are many specifications of cipher on internet, but I feel it as "padding" of essential problem.