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随便说几句关于单端口多用户的设计。简单来说这是一个先有鸡还是先有蛋的问题,服务器要知道连进来的是哪个用户,但流量是加密的,要知道用户ID才能进行解密。于是用户ID需要一套额外的沟通机制。

1. 总体性能最优的方案是 TLS 的证书交换机制,除了证书相关的几百个字节之外没有额外的开销,通讯性能也相当好。唯一的问题是证书交换时有明显的握手特征。
2. Shadowsocks 不支持多用户。服务器唯一的兼容做法是尝试使用每一个用户密钥解密流量,在用户量大的时候会影响握手性能。
3. SSR 支持多用户但有一个问题,其对用户ID的加密没有满足密码学的要求。
4. VMess 对于多用户的解决方案是预生成大量的密钥(每秒钟N个,N = AlterID + 1)并缓存哈希后的数据,用空间换时间的方式判断用户ID,并保证ID不会被破解。

Q: 用户ID被破解有什么意义?
A: 由于单个客户端长期使用单个ID(密钥),如果能从流量反推出稳定的ID,那也就间接证明了这些流量都用了某一种协议。



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随便说几句关于单端口多用户的设计。简单来说这是一个先有鸡还是先有蛋的问题,服务器要知道连进来的是哪个用户,但流量是加密的,要知道用户ID才能进行解密。于是用户ID需要一套额外的沟通机制。

1. 总体性能最优的方案是 TLS 的证书交换机制,除了证书相关的几百个字节之外没有额外的开销,通讯性能也相当好。唯一的问题是证书交换时有明显的握手特征。
2. Shadowsocks 不支持多用户。服务器唯一的兼容做法是尝试使用每一个用户密钥解密流量,在用户量大的时候会影响握手性能。
3. SSR 支持多用户但有一个问题,其对用户ID的加密没有满足密码学的要求。
4. VMess 对于多用户的解决方案是预生成大量的密钥(每秒钟N个,N = AlterID + 1)并缓存哈希后的数据,用空间换时间的方式判断用户ID,并保证ID不会被破解。

Q: 用户ID被破解有什么意义?
A: 由于单个客户端长期使用单个ID(密钥),如果能从流量反推出稳定的ID,那也就间接证明了这些流量都用了某一种协议。

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How Does Bitcoin Mining Work?

Bitcoin mining is the process of adding new transactions to the Bitcoin blockchain. It’s a tough job. People who choose to mine Bitcoin use a process called proof of work, deploying computers in a race to solve mathematical puzzles that verify transactions.To entice miners to keep racing to solve the puzzles and support the overall system, the Bitcoin code rewards miners with new Bitcoins. “This is how new coins are created” and new transactions are added to the blockchain, says Okoro.

What Is Bitcoin?

Bitcoin is a decentralized digital currency that you can buy, sell and exchange directly, without an intermediary like a bank. Bitcoin’s creator, Satoshi Nakamoto, originally described the need for “an electronic payment system based on cryptographic proof instead of trust.” Each and every Bitcoin transaction that’s ever been made exists on a public ledger accessible to everyone, making transactions hard to reverse and difficult to fake. That’s by design: Core to their decentralized nature, Bitcoins aren’t backed by the government or any issuing institution, and there’s nothing to guarantee their value besides the proof baked in the heart of the system. “The reason why it’s worth money is simply because we, as people, decided it has value—same as gold,” says Anton Mozgovoy, co-founder & CEO of digital financial service company Holyheld.

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