Benjamin Lipp

• Master of Science
• PostDoc Position at Max Planck Institute for Security and Privacy

The Hybrid Public Key Encryption (HPKE) standard was recently published as RFC 9180 by the Crypto Forum Research Group (CFRG) of the Internet Research Task Force (IRTF). The RFC specifies an efficient public key encryption scheme, combining asymmetric and symmetric cryptographic building blocks. Out of HPKE’s four modes, two have already been forma...

Cryptographic protocols are one of the foundations for the trust people put in computer systems nowadays, be it online banking, any web or cloud services, or secure messaging. One of the best theoretical assurances for cryptographic protocol security is reached through proofs in the computational model. Writing such proofs is prone to subtle errors...

The Hybrid Public Key Encryption (HPKE) scheme is an emerging standard currently under consideration by the Crypto Forum Research Group (CFRG) of the IETF as a candidate for formal approval. Of the four modes of HPKE, we analyse the authenticated mode HPKE_Auth in its single-shot encryption form as it contains what is, arguably, the most novel part...

WireGuard is a free and open source Virtual Private Network (VPN) that aims to replace IPsec and OpenVPN. It is based on a new cryptographic protocol derived from the Noise Protocol Framework. This paper presents the first mechanised cryptographic proof of the protocol underlying WireGuard, using the CryptoVerif proof assistant. We analyse the ent...