Openssl encrypt decrypt files

Do this: openssl enc -aescbc -pbkdf2 -iter -in hello -out hello. Read the damn question. Arnold Balliu Arnold Balliu 1, 9 9 silver badges 20 20 bronze badges. However the iteration count is extrememly low, and needs to be set to a much higher level.

If that count is randomised, then you also get a extra level of 'saltiness' to your encryption. To encrypt a file: openssl aescbc -e -salt -pbkdf2 -iter -in plaintextfilename -out encryptedfilename To decrypt a file: openssl aescbc -d -salt -pbkdf2 -iter -in encryptedfilename -out plaintextfilename. Uwe Keim Which as these options keep changing, means you need to also keep a record of what options was used when creating each openssl encrypted file.

Especially as the iteration count should increase with time! For one solution see as relatively simple wrapper around openssl enc Also see github. Update using a random generated public key. Ewoks However its default iteration count is very low, and needs to be much larger. Michael linkston Michael linkston 29 2 2 bronze badges. Things have changed when using openssl for file encryption, their are a lot more options, which needs need to be remembers so you can successfully decrypt encrypted files.

One solution to this is "keepout" antofthy. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science.

Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked 0. See more linked questions. Related The shared key can live in a protected file -kfile , or share by word of mouth. Remember, the encrypted file is only as safe as the secret is truly secret.

While not used in the provided examples, -salt is recommended and will protect against dictionary attacks. Where enc means encrypt, -aes is the cipher defaults to -aescbc , -base64 encoded, -in dt. Where enc -d means decrypt, -aes is the cipher make sure to use the same cipher as used when encrypting , -base64 if encoded, -in dt.

As you noticed in the previous example without pbkdf2, the key derivation was deprecated and it recommends to use -pbkdf2 for key derivation.

Note that the only difference when using pbkdf2 is the corresponding flag. Other flags stay the same. The default number of PBKDF2 iterations is 10,, but this can be changed to a higher number using the -iter flag.

For example, the 1Password service derives keys with , iterations. To decrypt the pbkdf2 encrypted data if using iterations other than the default make sure to include that with -iter :.

If you like what you are reading, please consider buying us a coffee or 2 as a token of appreciation. We are thankful for your never ending support. I am bothered by the comment of Quiark who claims to know something about the security of cryptographic methods, but shows that he knows nothing. Zomegagon references articles implying that openssl is inherently insecure, vs gpg. However, neither openssl nor gpg are cryptographic methods in themselves.

They are front ends that call crypto algorithms from open source crypto libraries, and the user selects the crypto of his choice and the crypto parameters to suite his needs.

These libraries are the gold standards upon which most of the modern internet depends. Unless you believe that closed source, proprietary cryptography is superior to open source cryptography. That argument, security by obscurity has been made many times and lost. Cool Tip: Need to improve security of the Linux system? I have used the last command line to decrypt a file but my lecturer hinted that I need to use a parameter related to encoding. What is it? The code is base I encrypted a.

Some folks say it could not be done, but it seemed to have worked for me. Note: If I use the same code, but change the output name, it can decrypt just fine. My issue was that I encrypted the file using the same output name as the input, which has made it impossible for me to decrypt it.

When I tried to decrypt it, I received the folllowing messages: enter aescbc decryption password: error reading input file. Hello, how are you? I have an encrypted file which I forgot the password, it is a file.