Are there any hand ciphers not obsoleted by computer cryptanalysis?
One time pad is definitely both easy to do and has perfect secrecy, but key management is a pain and can compromise security. Basically a Vigenère cipher with a key as long as the the message should be secure, because different keys can create ALL possible messages with equal probabilities.

Again, it's a one time pad, so no KPA, CPA, or CCA security. Actually I don't think any pen &amp; paper cipher system has such security.