![]() The DisabledByDefault value in the registry keys under the Protocols key does not take precedence over the grbitEnabledProtocols value that is defined in the SCHANNEL_CRED structure that contains the data for an Schannel credential. The Windows NT 4.0 Service Pack 6 Microsoft TLS/SSL Security Provider supports the following SSL 3.0-defined CipherSuite when you use the Base Cryptographic Provider or the Enhanced Cryptographic Provider: SSL 3.0 When you use RSA as both key exchange and authentication algorithms, the term RSA appears only one time in the corresponding cipher suite definitions. Each cipher suite determines the key exchange, authentication, encryption, and MAC algorithms that are used in an SSL/TLS session. Cipher suitesīoth SSL 3.0 and TLS 1.0 (RFC2246) with INTERNET-DRAFT 56-bit Export Cipher Suites For TLS draft-ietf-tls-56-bit-ciphersuites-00.txt provide options to use different cipher suites. In Windows NT 4.0 Service Pack 6, the Schannel.dll file does not use the Microsoft Base DSS Cryptographic Provider (Dssbase.dll) or the Microsoft DS/Diffie-Hellman Enhanced Cryptographic Provider (Dssenh.dll). You can use the Windows registry to control the use of specific SSL 3.0 or TLS 1.0 cipher suites with respect to the cryptographic algorithms that are supported by the Base Cryptographic Provider or the Enhanced Cryptographic Provider. This article contains the necessary information to configure the TLS/SSL Security Provider for Windows NT 4.0 Service Pack 6 and later versions. Cipher Suites 1 and 2 are not supported in IIS 4.0 and 5.0. However, the program must also support Cipher Suite 1 and 2. You can change the Schannel.dll file to support Cipher Suite 1 and 2. Microsoft TLS/SSL Security Provider, the Schannel.dll file, uses the CSPs that are listed here to conduct secure communications over SSL or TLS in its support for Internet Explorer and Internet Information Services (IIS).
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