Encrypt and decrypt files

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Using OpenSSL[edit]

Encrypt and decrypt a file[1] (GPG can also be used for encrypting and decrypting files)
Using aes-256-cbc cypher, You will be prompted for a password when encrypting that has to be used for decrypting.[2]

openssl enc -aes-256-cbc -in un_encrypted.data -out encrypted.data
You can use file command to verify file type.
file encrypted.data
encrypted.data: openssl enc'd data with salted password
Encrypt file providing password on the command line, be aware that your password will be store on history of your shell):
openssl aes-256-cbc -a -salt -in twitterpost.txt -out foo.enc -pass file:<( echo -n "someGoodPassword" )
openssl enc -d -aes-256-cbc -in encrypted.data -out un_encrypted.data


macOS options:

  • -salt Use a salt in the key derivation routines (the default). When the salt is being used the first eight bytes of the encrypted data are reserved for the salt: it is randomly generated when encrypting a file and read from the encrypted file when it is decrypted.

Related terms[edit]

See also[edit]

  • https://unix.stackexchange.com/questions/162960/how-can-i-encrypt-a-file
  • https://stackoverflow.com/a/31552829