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openssl

Encrypt file 

openssl aes-256-cbc -a -salt -pbkdf2 -in secrets.txt -out secrets.txt.enc

Decrypt file 

openssl aes-256-cbc -d -a -pbkdf2 -in secrets.txt.enc -out secrets.txt.new

Encrypt file 

openssl enc -aes256 -k PAS123 -in /tmp/backup.tgz -out /tmp/backup.tgz.enc

Decrypt file 

openssl enc -d -aes256 -k PAS123 -in /tmp/backup.tgz.enc -out /tmp/backup.tgz