The SHA-1 algorithm has been disabled by default in TLS/DTLS 1.2 handshake signatures, by adding "rsa_pkcs1_sha1 usage HandshakeSignature, ecdsa_sha1 usage HandshakeSignature, dsa_sha1 usage HandshakeSignature" to the `jdk.tls.disabledAlgorithms` security property in the `java.security` config file. RFC 9155 deprecates the use of SHA-1 in TLS & DTLS 1.2 digital signatures. Users can, at their own risk, re-enable the SHA-1 algorithm in TLS/DTLS 1.2 handshake signatures by removing "rsa_pkcs1_sha1 usage HandshakeSignature, ecdsa_sha1 usage HandshakeSignature, dsa_sha1 usage HandshakeSignature" from the `jdk.tls.disabledAlgorithms` security property.