Decryption with Pen and Paper

Question

Is there any secure method for symmetric or asymmetric encryption that can be performed by hand, and is still resilient to computing resources? Suppose I want to record a secret on paper and decrypt it only with a passphrase that I know, or a private key that I have tattooed on my body. Is this feasible?

simplicialset · Accepted Answer

You should look into handycipher: https://www.schneier.com/blog/archives/2014/04/a_new_pencil-....

vivegi · Answer

One time pads.Key distribution is done out of band. For eg: n-th character of prime numbered paragraphs in the book Bleak House by Dickens is the key.True to its name, never reuse the one-time-pad between messages.