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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.
Mattlinux1
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2 Answers2

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For confidentiality purposes?

  • one time pad (when possible)
  • rc4 (because you can by hand)
Thomas M. DuBuisson
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I suggest Vigenère cipher, it is fun on paper and also you can be creative in using key. you can use your phone number as key or your entire family phone number in age order. 

Key:        ABCDABCDABCDABCDABCDABCDABCD
Plaintext:  CRYPTOISSHORTFORCRYPTOGRAPHY
Ciphertext: CSASTPKVSIQUTGQUCSASTPIUAQJB

http://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

Nima
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