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We investigate nonce reuse issues with the GCM block cipher mode as used in TLS and focus in particular on AES-GCM, themost widely deployed variant. With an Internet-wide scan we identi ed 184 HTTPS servers repeating nonces, which fully breaks the authenticity of the connections. Affected servers include large corporations, nancial institutions, and a(More)
PGP-based encryption systems use a network of key servers to share public keys. These key server operate on an add only basis, thus the data gives us access to PGP public keys from over 20 years of PGP usage. Analyzing this data allows searching for cryptographic weaknesses in large scale. I created a parser script that puts the raw cryptographic data of(More)
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