Q1 and Q2 should be easily answerable with a quick Google search.
For Q3 - I would recommend you don't attempt to implement PGP from scratch without a very good reason (and certainly not if you are still flummoxed by Q1 and Q2). If you wish to play with PGP from Java, try using the BouncyCastle libraries, which offer PGP support.
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通过快速 Google 搜索应该可以轻松回答 Q1 和 Q2。
对于 Q3 - 我建议您不要在没有充分理由的情况下尝试从头开始实现 PGP（如果您仍然对 Q1 和 Q2 感到困惑，当然不要尝试）。如果您想在 Java 中使用 PGP，请尝试使用 BouncyCastle 库，它提供 PGP 支持。
Q1 and Q2 should be easily answerable with a quick Google search.
For Q3 - I would recommend you don't attempt to implement PGP from scratch without a very good reason (and certainly not if you are still flummoxed by Q1 and Q2). If you wish to play with PGP from Java, try using the BouncyCastle libraries, which offer PGP support.