erlang/otp
Jun 2026 – Jun 2026
1 Month active
Languages Used
Erlang
Technical Skills
Erlangcryptographynetwork security
Cole Christensen
PROFILE
Cole Christensen
Worked on the erlang/otp repository to address a cryptographic issue in the hybrid ECDH X25519 key exchange, focusing on the mlkem768x25519 shared-secret encoding. Using Erlang and applying expertise in cryptography and network security, the developer fixed the encoding to use a fixed-width, big-endian 32-byte octet string, ensuring genuine leading zeros are preserved. This change resolved handshake failures that previously occurred in about one out of every 512 attempts and improved interoperability with OpenSSH. A dedicated regression test was added to verify correct encoding and prevent regressions, demonstrating careful attention to cryptographic correctness and protocol consistency.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
2Total
Bugs
1
Commits
2
Features
0
Lines of code
4,634,667
Activity Months1
Work History
June 2026
2 Commits
Jun 1, 2026June 2026 – erlang/otp: Hardened the hybrid ECDH X25519 key exchange by fixing the mlkem768x25519 shared-secret encoding. The shared secret is now encoded as a fixed-width big-endian 32-byte octet string, preserving genuine leading zeros to match the peer and ensure consistent hashing. This prevents a class of handshake failures caused by misinterpreting the secret (roughly 1 in 512 handshakes) and improves interoperability with OpenSSH. A regression test ssh_algorithms_SUITE:mlkem768x25519_hybrid_secret_encoding was added to guard against reintroduction. The changes were implemented via two commits (869e6b5b907c68e4839189fff88328a992b866cc and 30e0d4ba21648195d53c092845b208ab11cb1c40) and are present in the OTP-28.4 lineage.
2 Commits
Jun 1, 2026June 2026 – erlang/otp: Hardened the hybrid ECDH X25519 key exchange by fixing the mlkem768x25519 shared-secret encoding. The shared secret is now encoded as a fixed-width big-endian 32-byte octet string, preserving genuine leading zeros to match the peer and ensure consistent hashing. This prevents a class of handshake failures caused by misinterpreting the secret (roughly 1 in 512 handshakes) and improves interoperability with OpenSSH. A regression test ssh_algorithms_SUITE:mlkem768x25519_hybrid_secret_encoding was added to guard against reintroduction. The changes were implemented via two commits (869e6b5b907c68e4839189fff88328a992b866cc and 30e0d4ba21648195d53c092845b208ab11cb1c40) and are present in the OTP-28.4 lineage.
June 2026
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Erlang
Technical Skills
Erlangcryptographynetwork security
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