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Abstract. This paper introduces TweetNaCl, a compact reimplementation of the NaCl library, including all 25 of the NaCl functions used by applications. TweetNaCl is published on Twitter and fits into just 100 tweets; the tweets are available from anywhere, any time, in an unsuspicious way. Distribution via other social media, or even printed on a sheet of A4 paper, is also easily possible.TweetNaCl is human-readable C code; it is the smallest readable implementation of a highsecurity cryptographic library. TweetNaCl is the first cryptographic library that allows correct functionality to be verified by human auditors with reasonable effort, making it suitable for inclusion into the trusted code base of a secure computer system. TweetNaCl consists of a single C source file, accompanied by a single header file generated by a short Python script (1811 bytes). The library can be trivially integrated into a wide range of software build processes.Portability and small code size come at a loss in efficiency, but TweetNaCl is sufficiently fast for most applications. TweetNaCl's cryptographic implementations meet the same security and reliability standards as NaCl: for example, complete protection against cache-timing attacks.

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