While applications can override this default by explicitly allowing it in the OpenSSL library, by default the library will refuse to negotiate connections with TLS Interop+Crypto+OpenSslCryptographicException: error:0E076071:configuration file routines:MODULE_RUN:unknown module name The default that was “recently” changed to support TLS 1.2: openssl (1.1.1~~pre3-1) experimental urgency=medium * Update to 1.1.1-pre3 * Don't suggest 1024 bit RSA key to be typical (Closes: #878303). Debian takes care of maintaining secure defaults in this package, mitigating the risk for both servers where Debian is run, as well as the few of us who run Debian on the desktop. One of the cryptographic libraries that is commonly used to handle the mechanisms of this connection is OpenSSL, and is packaged in Debian. The most recent version is the recently released TLS 1.3, with TLS 1.2 and TLS 1.1 largely deprecated at this point. These revisions each address weaknesses in the former design of the protocol that can allow leaking of the content of that encrypted connection, or even the theft of the unique cryptographic keys that underlie the connections security. The protocol has gone through several revisions from SSL being phased out in favour of the newer TLS, and TLS itself going through versions 1.0 → 1.3. These protocols sit underneath higher level protocols such as HTTP, HTTP/2, gRPC, QUIC, MySQL, Redis and so fourth transparently encrypting and decrypting information on either side of the connection. One of the more fundamental aspects of modern networked computers is the overlay of Transport Layer Security (TLS, and the successor to SSL) on TCP or UDP connections to provide identity and encryption guarantees. Changes to default TLS to ≥ 1.2 breaks weird stuff Necessary Background
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