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To encrypt files use these commands:

OpenSSL

openssl enc -in inputfilename -out outputfilename -aes256

GPG

Encrypt only using the public key of user@example.com (only that user can decrypt this file)

gpg -er user@example.com -o outputfile.enc inputfile

Encrypt and sign:

gpg -u you@example.com -ser user@example.com -o outputfile.enc inputfile