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JDK 27 首个新特性曝光:Java 开始为量子计算做准备

  • 2026-02-17 05:05:57
JDK 27 首个新特性曝光:Java 开始为量子计算做准备

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来源 | xxy开源 (ID:xxyopen)

就在最近,OpenJDK 更新了 JEP 527[1] 的状态,将其标记为 Proposed to Target: JDK 27,这意味着 JDK 27 可能将率先引入对“后量子 TLS”的官方支持

Java 的默认 TLS 通信,开始为量子计算时代做准备了。

当前互联网广泛使用的公钥密码体系(如RSAECDH / ECDHE)在 大规模量子计算机 面前,都存在被有效破解的理论可能。

更现实的问题是一个被称为 Harvest Now, Decrypt Later(现在收集,将来解密)的攻击模型。

攻击者今天就可以:

大规模监听并保存加密通信等量子计算机成熟回头再解密历史数据

这意味着:

即便量子计算机还没出现,今天的 TLS 数据已经不安全了。

但是完全切换到新的抗量子算法风险极高,因为:

新算法缺乏几十年的安全验证工程实现尚不成熟性能、互操作性仍在评估中

Java 的解决思路是 混合密钥交换(Hybrid Key Exchange)

核心思想其实很简单:

同时使用

一个传统算法(如 ECDHE)一个抗量子算法(如 ML-KEM)

只要其中一个算法是安全的,整体就是安全的。

这是当前 TLS 1.3 抵御量子攻击的主流方案。

JEP 527 的目标非常明确:

为 Java 的 TLS 1.3 实现,引入后量子混合密钥交换算法,且对现有应用“零代码修改”生效。

关键点一:仅作用于 TLS 1.3

不影响 TLS 1.2 及更早版本不扩展到 javax.net.ssl 之外的 API聚焦、安全、可控

关键点二:引入 3 种混合密钥交换组(Named Groups)

1. X25519MLKEM768

ECDHE:X25519抗量子算法:ML-KEM-768默认首选,性能最好

2. SecP256r1MLKEM768

ECDHE:secp256r1抗量子算法:ML-KEM-768

3. SecP384r1MLKEM1024

ECDHE:secp384r1抗量子算法:ML-KEM-1024

这些名称与 IANA TLS Named Groups 完全一致。

真正重要的一点是 无需任何代码改动,在 TLS 1.3 握手阶段,JDK 27 将默认按如下顺序声明支持的密钥交换组(Named Groups):

X25519MLKEM768,x25519,secp256r1,secp384r1,secp521r1,x448,ffdhe2048,ffdhe3072,ffdhe4096,ffdhe6144,ffdhe8192

也就是说:

只要你的代码没有手动限制 Named Groups,就会自动优先尝试后量子混合密钥交换。

这对现有 Java 应用来说是一个 无感升级

如果你希望更精细地控制 TLS 使用的密钥交换方案,JDK 27 提供了两种手动配置方式。

方式一:系统属性

java -Djdk.tls.namedGroups=SecP256r1MLKEM768,X25519MLKEM768,secp256r1,x25519

方式二:代码级控制(SSLParameters)

SSLSocket tlsSock = (SSLSocket)(SSLContext.getDefault()        .getSocketFactory().createSocket());SSLParameters params = tlsSock.getSSLParameters();params.setNamedGroups(new String[] {    "SecP256r1MLKEM768",    "X25519MLKEM768",    "secp256r1",    "x25519"});tlsSock.setSSLParameters(params);

值得说明的是这并不是 Java “临时起意”,Java 在过去几个版本中,已经提前铺好了路:

Java 21(JEP 452):引入 KEM APIJava 24(JEP 496):引入 ML-KEM 算法

JEP 527 本质上是:

把已经存在的密码学能力,真正用在 TLS 上。

这是 Java 平台对 后量子密码体系 的一次系统性推进。

References

[1] JEP 527: https://openjdk.org/jeps/527

END

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  1. CONNECT:[ UseTime:0.000530s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000764s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000246s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000527s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000554s ]
  8. SELECT * FROM `article` WHERE `id` = 475245 LIMIT 1 [ RunTime:0.001467s ]
  9. UPDATE `article` SET `lasttime` = 1771901158 WHERE `id` = 475245 [ RunTime:0.009339s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 475245 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000431s ]
  12. SELECT * FROM `article` WHERE `id` > 475245 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000365s ]
  13. SELECT * FROM `article` WHERE `id` < 475245 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002920s ]
  14. SELECT * FROM `article` WHERE `id` < 475245 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004662s ]
  15. SELECT * FROM `article` WHERE `id` < 475245 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001115s ]
0.103290s