Java(TM) Cryptography Extension Policy Files
for the Java(TM) Platform, Standard Edition Runtime Environment
README
------------------------------------------------------------------------
Import and export control rules on cryptographic software vary from
country to country. The Java Cryptography Extension (JCE) architecture
allows flexible cryptographic key strength to be configured via the
jurisdiction policy files which are referenced by the "crypto.policy"
security property in the <java-home>/conf/security/java.security file.
By default, Java provides two different sets of cryptographic policy
files:
unlimited: These policy files contain no restrictions on cryptographic
strengths or algorithms
limited: These policy files contain more restricted cryptographic
strengths
These files reside in <java-home>/conf/security/policy in the "unlimited"
or "limited" subdirectories respectively.
Each subdirectory contains a complete policy configuration,
and subdirectories can be added/edited/removed to reflect your
import or export control product requirements.
Within a subdirectory, the effective policy is the combined minimum
permissions of the grant statements in the file(s) matching the filename
pattern "default_*.policy". At least one grant is required. For example:
limited = Export (all) + Import (limited) = Limited
unlimited = Export (all) + Import (all) = Unlimited
The effective exemption policy is the combined minimum permissions
of the grant statements in the file(s) matching the filename pattern
"exempt_*.policy". Exemption grants are optional. For example:
limited = grants exemption permissions, by which the
effective policy can be circumvented.
e.g. KeyRecovery/KeyEscrow/KeyWeakening.
Please see the Java Cryptography Architecture (JCA) documentation for
additional information on these files and formats.
YOU ARE ADVISED TO CONSULT YOUR EXPORT/IMPORT CONTROL COUNSEL OR ATTORNEY
TO DETERMINE THE EXACT REQUIREMENTS.
Please note that the JCE for Java SE, including the JCE framework,
cryptographic policy files, and standard JCE providers provided with
the Java SE, have been reviewed and approved for export as mass market
encryption item by the US Bureau of Industry and Security.
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Java Development Kit (JDK) 11.0.21 for Windows x64 是 Oracle 提供的 Java SE 平台的长期支持版本,包含了许多增强功能和新特性,如局部变量类型推断、HttpClient API、改进的垃圾回收器和 TLS 1.3 支持。它适用于开发和运行 Java 应用程序,提供了核心库、工具和诊断工具。 安装 JDK 11.0.21 需要从官方渠道下载安装包,并按照向导进行安装。安装完成后,需设置 `JAVA_HOME` 环境变量并更新 `PATH` 变量。完成配置后,开发者可以使用 `javac` 编译 Java 代码,使用 `java` 运行应用程序,并利用其他开发工具和 IDE(如 IntelliJ IDEA 和 Eclipse)进行高效的 Java 应用开发。 新特性和改进: 模块系统:JDK 9 引入的模块系统得到了进一步改进,简化了大型应用程序的构建和维护。 垃圾回收器增强:包括 ZGC(低延迟垃圾收集器)和 Epsilon(无操作垃圾收集器)。 Flight Recorder:改进了性能和诊断工具,帮助开发者更好优化。
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jdk-11.0.21-windows-x64-bin.zip (421个子文件)
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public_suffix_list.dat 229KB
tzdb.dat 101KB
jvm.dll 11.14MB
awt.dll 1.36MB
ucrtbase.dll 1011KB
fontmanager.dll 826KB
msvcp140.dll 558KB
freetype.dll 536KB
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net.dll 94KB
jli.dll 90KB
unpack.dll 86KB
zip.dll 86KB
j2pkcs11.dll 77KB
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