How to encrypt a file with a passphrase, without using a gpg key

Solution Verified - Updated -

Issue

  • How can files be encrypted/decrypted using simply a passphrase (i.e., without using public/private gpg keys)?

Environment

  • gpg provided by gnupg/gnpug2 rpms
  • openssl provided by openssl rpm
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4

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