Have you heard about the recent ChaCha20-Poly1305 AEAD and are wondering about how secure it is? It`s comprised of two ciphers, ChaCha20 and Poly1305, that are designed to be constant time, making it naturally resistant to timing attacks. The AEAD is being used by many notable companies that also trust it for their security – such as Google Chrome and Apple’s HomeKit. ChaCha20-Poly1305 has gone through security analysis and is considered secure.
To view a formal security analysis done on Adam Langley`s IETF protocol using ChaCha20-Poly1305 see https://eprint.iacr.org/2014/613.pdf
For added analysis done on Salsa (what ChaCha is based from) see section 5 from http://cr.yp.to/snuffle/salsafamily-20071225.pdf
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