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Please suggest algorithms to encrypt and decrypt text messages that can be easily performed by human in a considerably short time. It doesn't have to be really secure, but sufficient to fool unskillful third parties.

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marked as duplicate by yyyyyyy, tylo, Maeher, cygnusv, Guut Boy Jan 26 '15 at 15:41

This question was marked as an exact duplicate of an existing question.

    
"Unskillful" is a very vague term. How do you define it? Anyway, considering your requirement that it should be easily performed by a human in a very short time, I don't believe there would be anything better than Vigenère cipher or a One-Time Pad – cygnusv Jan 26 '15 at 9:01
    
What research have you done? This is quite off-topic, because it is just a reference request (or a duplicate of the mentioned question) – tylo Jan 26 '15 at 11:15

I think Caesar cipher meets your requiremnts, check it out here Caesar Cipher

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