gpg使用攻略

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$gpg --expert --full-gen-key
gpg (GnuPG/MacGPG2) 2.2.0; Copyright (C) 2017 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

请选择您要使用的密钥种类：
   (1) RSA and RSA (default)
   (2) DSA and Elgamal
   (3) DSA (仅用于签名)
   (4) RSA (仅用于签名)
   (7) DSA (自定义用途)
   (8) RSA (自定义用途)
   (9) ECC and ECC
  (10) ECC (sign only)
  (11) ECC (set your own capabilities)
  (13) Existing key
您的选择？ 9

Please select which elliptic curve you want:
   (1) Curve 25519
   (3) NIST P-256
   (4) NIST P-384
   (5) NIST P-521
   (6) Brainpool P-256
   (7) Brainpool P-384
   (8) Brainpool P-512
   (9) secp256k1
您的选择？ 1

请设定这把密钥的有效期限。
         0 = 密钥永不过期
      <n>  = 密钥在 n 天后过期
      <n>w = 密钥在 n 周后过期
      <n>m = 密钥在 n 月后过期
      <n>y = 密钥在 n 年后过期
密钥的有效期限是？(0) 0