Transport Layer Security (TLS)

wikipedia:Transport Layer Security cryptographic protocol successor to SSL (deprecated since 2011).

Once the client and server have agreed to use TLS, they negotiate a stateful connection by using a handshaking procedure. The protocols use a handshake with an asymmetric cipher to establish not only cipher settings but also a session-specific shared key with which further communication is encrypted using a symmetric cipher.

• https://support.apple.com/en-us/HT211025, 398 days

macOS 10.15 (June 2019) and IOS 13 requirements (https://support.apple.com/en-us/HT210176)

• TLS server certificates and issuing CAs using RSA keys must use key sizes greater than or equal to 2048 bits
• SHA-2

• 2014 LibreSSL
• OpenVPN (2001)
• X.509
• SHA-224, MD5
• HKDF
• cfssl

SSL and TLS protocols

Protocol	Published	Status
SSL 1.0	Unpublished	Unpublished
SSL 2.0	1995	Deprecated in 2011 (RFC 6176)
SSL 3.0	1996	Deprecated in 2015 (RFC 7568)
TLS 1.0	1999	Deprecation planned in 2020
TLS 1.1	2006	Deprecation planned in 2020
TLS 1.2	2008
TLS 1.3	2018

Errors

• unable to get local issuer certificate

Related terms

• SMTPS ((TCP port number 465 using TLS)) (deprecated)
• HTTPS
• STARTTLS
• podman pull --tls-verify=false
• ssl_protocols Nginx directive
• Your connection is not private
• NET::ERR CERT INVALID
• ALB: AWS Application Load Balancer (ALB)
• SSL Certificate Checker
• Datagram Transport Layer Security (DTLS)
• tls_private_key
• k8s cert-manager
• Predefined SSL security policies for Classic Load Balancers
• Certificate signed by unknown authority
• SSL/TLS Protocol: TLSv1.2,ECDHE-ECDSA-CHACHA20-POLY1305,256,256
• openssl s client -connect

See also

• Certificate: .pem, .ppk, .pfx, .p12, .cer, .crt, openssl pkcs12, .csr, .pub, PFX, PKCS, PKCS
• TLS, mTLS: OpenSSL, LibreSSL, BoringSSL, WolfSSL, X.509, .pem, SNI, CT, OCSP, Mbed TLS, ALPN, your connection is not private, SSL Certificate Checker, Wildcard certificate, JA3 fingerprint, sslcan, TLS inspection

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