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🔐 对称加密解密（多算法）Symmetric Encryption (AES/DES/3DES/RC4/Rabbit)
支持 AES、DES、3DES、RC4、Rabbit 多种对称算法，兼容 CryptoJS：可选口令或自定义密钥/IV、ECB/CBC/CTR/CFB/OFB 模式和多种填充，本地运行。AES, DES, 3DES, RC4 and Rabbit symmetric encryption, CryptoJS-compatible: passphrase or custom key/IV, ECB/CBC/CTR/CFB/OFB modes and multiple paddings, all local.
使用说明与常见问题How-to & FAQ
「对称加密解密（多算法）」是什么？What is the Symmetric Encryption (AES/DES/3DES/RC4/Rabbit) tool?
支持 AES、DES、3DES、RC4、Rabbit 多种对称算法，兼容 CryptoJS：可选口令或自定义密钥/IV、ECB/CBC/CTR/CFB/OFB 模式和多种填充，本地运行。AES, DES, 3DES, RC4 and Rabbit symmetric encryption, CryptoJS-compatible: passphrase or custom key/IV, ECB/CBC/CTR/CFB/OFB modes and multiple paddings, all local.
如何使用「对称加密解密（多算法）」？How do I use the Symmetric Encryption (AES/DES/3DES/RC4/Rabbit) tool?
在「对称加密解密（多算法）」中，按需设置「算法」、「操作」、「密钥/口令」、「密钥格式」、「模式」等选项，然后点击「复制结果」按钮即可。In the Symmetric Encryption (AES/DES/3DES/RC4/Rabbit): Set "Algorithm", "Operation", "Key / passphrase", "Key format", "Mode", then click "Copy".
这与 CryptoJS 兼容吗？Is this CryptoJS-compatible?
是的，基于 CryptoJS 库。口令模式输出 OpenSSL 的“Salted__”Base64 格式；自定义密钥模式可选 Hex/Base64 密文，便于与后端对接。Yes, it uses CryptoJS. Passphrase mode produces OpenSSL "Salted__" Base64; key mode outputs Hex/Base64 ciphertext for interop with back ends.
加密安全吗？Is it secure?
DES、3DES、RC4 已较弱，新项目请优先使用 AES（CBC/GCM）。ECB 模式会暴露数据规律，不建议用于真实数据。DES, 3DES and RC4 are weak; prefer AES (CBC/GCM) for new work. ECB leaks patterns and is not recommended for real data.
「对称加密解密（多算法）」免费吗？需要注册吗？Is the Symmetric Encryption (AES/DES/3DES/RC4/Rabbit) free? Do I need an account?
「对称加密解密（多算法）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Symmetric Encryption (AES/DES/3DES/RC4/Rabbit) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.