RELEASE NOTES: JDK 11.0.21

The Default TLS Diffie-Hellman Group Size Has Been Increased from 1024-bit to 2048-bit

The JDK implementation of TLS 1.2 now uses a default Diffie Hellman keysize of 2048 bits when a TLS_DHE cipher suite is negotiated and either the client or server does not support FFDHE, which can negotiate a stronger keysize. The JDK TLS implementation supports FFDHE and it is enabled by default.

As a workaround, users can revert to the previous size by setting the jdk.tls.ephemeralDHKeySize system property to 1024 (at their own risk).

This change does not affect TLS 1.3 as the minimum DH group size is already 2048 bits.

Use Server Cipher Suites Preference by Default

For TLS connections, the cipher suite selection, by default, is updated to use the server cipher suites preference. Applications can configure the behavior by using the SSLParameters.setUseCipherSuitesOrder​() method.

JDK Now Accepts RSA Keys in PKCS#1 Format

RSA private and public keys in PKCS#1 format can now be accepted by JDK providers, such as the RSA KeyFactory.impl from the SunRsaSign provider. The RSA private or public key object should have the PKCS#1 format and an encoding matching the ASN.1 syntax for a PKCS#1 RSA private key and public key.

`-XshowSettings:locale` Output Now Includes Tzdata Version

The -XshowSettings launcher option has been enhanced to print the tzdata version configured with the JDK. The tzdata version is displayed as part of the locale showSettings option.

Example output using -X:showSettings:locale: ` ..... Locale settings: default locale = English default display locale = English default format locale = English tzdata version = 2023c ..... `

Removed SECOM Trust System's RootCA1 Root Certificate

The following root certificate from SECOM Trust System has been removed from the cacerts keystore: ``` + alias name "secomscrootca1 [jdk]" Distinguished Name: OU=Security Communication RootCA1, O=SECOM Trust.net, C=JP

```

Added Certigna Root CA Certificate

The following root certificate has been added to the cacerts truststore: ` + Certigna (Dhimyotis) + certignarootca DN: CN=Certigna Root CA, OU=0002 48146308100036, O=Dhimyotis, C=FR `

Throw Error If Default java.security File Fails to Load

A behavioral change has been made when the default conf/security/java.security security configuration file fails to load. In such a scenario, the JDK will now throw an InternalError.

Such a scenario should never occur. The default security file should always be present. Prior to this change, a static security configuration was loaded.