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.