The OpenSSL Project has released OpenSSL 4.1.0 Alpha1, an early preview of its forthcoming feature release. This update adds support for Datagram Transport Layer Security (DTLS) 1.3, GREASE for more resilient TLS deployments, and architecture-specific performance enhancements for post-quantum cryptography operations.
As an alpha release, it is intended for testing and development, not production deployment. Organizations should carefully evaluate application compatibility and performance before upgrading.
A notable addition in OpenSSL 4.1.0 Alpha1 is support for DTLS 1.3, which secures UDP-based communications that are critical for real-time applications like video calls, online gaming, and IoT devices.
This implementation adheres to RFC 9147 and provides TLS-like security while addressing UDP characteristics such as packet loss and reordering. Additionally, DTLS support has been integrated into the SSL listener API, streamlining development for applications managing DTLS connections.
OpenSSL 4.1.0 Alpha1 Released
The release optimizes two post-quantum cryptographic algorithms: ML-DSA (a digital signature algorithm) and ML-KEM (a key-encapsulation mechanism), both designed to resist quantum computing attacks.
With enhancements for Number Theoretic Transform operations on specific architectures, this update is crucial for enterprises engaging in post-quantum TLS, certificate workflows, and high-volume cryptographic services.
Optimizations for x86_64 systems include AVX-512 for SHAKE x4 operations, boosting signature generation and verification throughput. OpenSSL 4.1.0 Alpha1 delivers performance improvements for AES-CBC decryption on x86_64 systems through AVX-512 and VAES optimizations.
The release introduces build targets for Microsoft Visual C++ 2013, enhancing support in older compiler environments. However, it removes support for Windows-on-Itanium and Windows CE build targets.
This release also incorporates GREASE (RFC 8701), which helps identify and address compatibility issues with network devices and TLS implementations that reject unknown protocol values.
By using reserved values in protocol exchanges, GREASE fosters better long-term compatibility in the TLS ecosystem. It also supports the IKEv2 key derivation function (KDF), which is relevant for IPsec VPNs. The updated tsget utility now uses Net::Curl::Easy instead of the abandoned WWW::Curl::Easy to avoid dependency failures.
Additionally, the no-ecdsa and no-ecdh Configure options have been removed, directing administrators to use the no-ec option instead for disabling elliptic-curve cryptography. The release also introduces initial support for the Elbrus2000 (e2k) processor architecture.
Security teams should view this release as a testing opportunity for future OpenSSL compatibility rather than an immediate production upgrade. Recommended actions include testing DTLS 1.3 interoperability and evaluating the impact of these updates on existing systems.
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