GPG - Generate Keypairs

1. generate a gpg key

gpg --gen-key

gpg (GnuPG) 2.2.27; Copyright (C) 2021 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.

Note: Use "gpg --full-generate-key" for a full featured key generation dialog.

GnuPG needs to construct a user ID to identify your key.

2. Enter a real name

Real name: Richard Yim

3. Enter a email

Email address: RichardYim@ami.com

4. Confirm information

You selected this USER-ID:
    "Richard Yim <RichardYim@ami.com>"

Change (N)ame, (E)mail, or (O)kay/(Q)uit?

5. Enter the passphrase (make sure remembered)

passphrase is better with digit(s) or special-character(s)

┌──────────────────────────────────────────────────────┐
│ Please enter the passphrase to                       │
│ protect your new key                                 │
│                                                      │
│ Passphrase: ________________________________________ │
│                                                      │
│       <OK>                              <Cancel>     │
└──────────────────────────────────────────────────────┘

We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
...
gpg: /home/jun/.gnupg/trustdb.gpg: trustdb created
...
public and secret key created and signed.

pub rsa3072 2023-07-22 [SC] [expires: 2025-07-21]
(...pub key id here...)
uid Richard Yim richardyim@ami.com
sub rsa3072 2023-07-22 [E] [expires: 2025-07-21]

Modify expires date

1. Edit with public key ID

gpg --edit-key <id of pub key>

2. Insert expires in STDIN

gpg> expires

3. Select expires date

Changing expiration time for the primary key.
Please specify how long the key should be valid.
0 = key does not expire
= key expires in n days
w = key expires in n weeks
m = key expires in n months
y = key expires in n years
Key is valid for? (0)