SAY IT AIN'T SO - AN IMPLEMENTATION OF DENIABLE ENCRYPTION

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Presented at BlackhatAsia 2014 by

Ari Trachtenberg

We are interested in the ability to lie convincingly about the contents of an encrypted file, a variation of "deniable encryption" from the cryptography literature. A reasonable scenario may involve a businessman traveling through dangerous territory with sensitive documents, who, if kidnapped or under duress, wants to be able to convincingly lie to his kidnappers about the contents of his documents. We will thus release a tool that allows users to encrypt a text in such a way that it can be decrypted not just to the original text (using the correct key), but also to other possible texts (using decoy keys). For example, with one key, the text might decrypt to "Don't cry for me Argentina", but with the right key, it would decrypt to "Don't try to meet Angelina."