What would be the best plain text Cryptography method without the use of a computer? What would be the best Cryptography method without the use of a computer?


  This could be a list of the current options available, that could be used without
  the use of a computer system/electronic device. Moreover, would like to identify what types of Cryptography techniques could be used to encrypt a small a amount of hand written, "plain text" without numbers or symbols just (characters). that being hard to implement or easy to implement.


Would like A brief description of:


E.g. types of cipher's
Different types of algorithm.
The range in security, low to high etc.
For confidentiality purposes?


one time pad (when possible)
rc4 (because you can by hand)