What is the best nuclear missile crypto system?

Posted by The Rook on Stack Overflow See other posts from Stack Overflow or by The Rook
Published on 2010-05-05T09:06:45Z Indexed on 2010/05/05 9:08 UTC
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cryptography

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encryption

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security

You are on a submarine and there is an encrypted message that you want to read. Two people must use their keys at the same time in order to obtain the plain text. What is best cryptographic primitive to use? Are the following two implementations suitable?

plain_text=decrypt(Key1 XOR key2,ciper_text,IV)

plain_text=decrypt(Key1,rc4_encrypt(key2,ciper_text,IV2),IV1)

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