How do I encrypt a large file using OpenSSL?

How do I encrypt a large file using OpenSSL?

How to encrypt a big file using OpenSSL and someone’s public key

1. Step 0) Get their public key. The other person needs to send you their public key in .pem format.
2. Step 1) Generate a 256 bit (32 byte) random key.
3. Step 2) Encrypt the key.
4. Step 3) Actually Encrypt our large file.
5. Step 4) Send/Decrypt the files.

How do I encrypt a text file with a key?

You can encrypt the text file directly or put it in a new folder and then encrypt the folder. Right-click the file, select Properties and click the Advanced button. Select Encrypt Contents to Secure Data. Note that you can also compress the contents to save disk space.

How to encrypt large file in OpenSSL using public key stack?

The other person has the decrypted file and it was safely sent. You can’t directly encrypt a large file using rsautl. instead, do something like the following: Encrypt the data using openssl enc, using the generated key from step 1.

How to encrypt a large file using rsautl?

You can’t directly encrypt a large file using rsautl. instead, do something like the following: Encrypt the data using openssl enc, using the generated key from step 1. Package the encrypted key file with the encrypted data. the recipient will need to decrypt the key with their private key, then decrypt the data with the resulting key.

How to encrypt a large file by a public key?

You’d be far better off encrypting your big input file with some symmetric algorithm (e.g. AES) and then encrypting with the RSA key (private or public, depending on your needs) the key used with this algorithm. How can I encrypt a large file (like 100mb) with a public key so that no one other than who has the private key be able to decrypt it?

How is a symmetric key encrypted in OpenSSL?

Each time a new random symmetric key is generated, used, and then encrypted with the RSA cipher (public key). The ciphertext together with the encrypted symmetric key is transferred to the recipient. The recipient decrypts the symmetric key using his private key, and then uses the symmetric key to decrypt the message.