针对 iPhone 使用 AES 的非对称加密
团队，
我想使用 Objective C 对 iPhone 应用程序使用 AES 算法进行非对称加密。 我广泛看到使用 AES 的对称加密，因此我不确定 AES 对非对称加密的支持。请就此向我提出建议。
Team,
I would like to have asymmetric encryption using AES algorithm for iPhone application using Objective C.
I have widely seen symmetric encryption using AES, so im not sure about the support for asymmetric encryption with AES. Kindly suggest me on this.
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AES 是一种对称密码。它不能简单地用作非对称（即公钥）容量。
我猜您问题的原因是密钥交换问题 - 这样您就可以建立 AES 加密连接，而不必依赖预共享密钥。
存在许多有效的方法，但我只提出两个：
看看 Diffie-Hellman。您可以让连接双方就密钥达成一致，而无需实际交换该密钥。 http://en.wikipedia.org/wiki/Diffie–Hellman_key_exchange
RSA。我是牡丹的粉丝。它是免费的。有用。您可以在双方生成公钥/私钥对，交换公钥，然后安全地交换私钥，然后启动 AES。 http://botan.randombit.net/pubkey.html
与往常一样，此建议需要伴随着警告：很容易错误地执行此操作，并且很大程度上（或完全）阻碍您的安全工作。小心行事。
AES is a symmetric cipher. It can't simply be used an an asymmetric (i.e., public-key) capacity.
I am guessing the reason for your question is the issue of key exchange - such that you can establish an AES-encrypted connection without having to rely on a pre-shared key.
Numerous valid approaches exist, but I'll just hit on two:
Take a look at or Diffie-Hellman. You can get both sides of a connection to agree on a key without actually having to exchange that key. http://en.wikipedia.org/wiki/Diffie–Hellman_key_exchange
RSA. I'm a fan of Botan. It's free. It works. You can generate public/private key pairs on both sides, exchange the public keys, then securely exchange private keys, and then start AES. http://botan.randombit.net/pubkey.html
As always, this advice needs to be accompanied with a warning: it's very easy to do this incorrectly and largely (or entirely) thwart your security efforts. Tread carefully.