In this case we use AES, but you can use other like Camelia. Your file is encrypted now! Well, is a new file in the root folder, the new file is encrypted. OPENSSL ENCRYPTO PASSWORDThen, write the password and verify the password. And write the next command: openssl enc -aes-256-cbc -in -out -pbkdf2 Then, move your files to root folder using files app you know, files like books, photos of you cat or dog, personal information files, I don’t know. OPENSSL ENCRYPTO APKSecond, write the next command: apk add openssl OPENSSL ENCRYPTO HOW TOOther ciphers or key lenghts may have in different results.Hi I’m Depredador, and now I want to explain you how to encrypt files with ish and openssl. With the content of a standard 1.6 Linux Agent I dont see any performance impacts. openssl pkeyutl -pubin -inkey ~/.ssl/public.pem -encrypt <<< $\n")Ĭreate a rule “Individual program call instead of agent access” to call this script instead of the OOB code. I also base64 encode the output just to be save and not having problems on the transport medium with unsupported code. OPENSSL ENCRYPTO CODEThis line of code is using the public key to do the asymmetric encryption of the secret. The length I used here is 8 characters and it could be increased up to 24 characters. I used OPENSSL also to create the random secret. I will explain the different steps one by one to give a better understanding and then show the how to bring that together. Its is save to share the public key, because it could only be used to encrypt content but not to unencrypt encrypted content. rsautl To encrypt/decrypt or sign/verify signature with RSA. The public key must be distributed to all servers which should be monitored and accessible by the user running the agent wrapper script shown below in chapter 3.3. Keep the key file save and dont share it. In case of distributed monitoring, the key could be used on the remote sites but it might be also possible to use separate key pairs per site. The key file and the directory access should be limited to the site user for security reasons. The key should be created on the monitoring server and put in a save directory below site user home directory. How to create a private key with OPENSSL and extract the public key is meanwhile public knowledge and I dont want to explain it here again. On the monitoring server the secret is then decrypted with the private key and used to decrypt the content. In the above command, enc openssl command to encode with ciphers-e option to encrypt the input file/stream-aes256 encryption cipher-in input file location or name, data. openssl enc -e -aes256 -in data.txt -out secureddata.txt. The secret will be then encrypted with the public key and both, the symmetric encrypted content and the asymmetric encrypted secret is then sent to the monitoring server. Here is an example to encrypt a single file data.txt using encryption cipher. As we cannot create infinite long key´s we need to go a little detour which at the end use again symmetric encryption for the content but in a very secure way.Īs a first step we create on the agent side a random secret which we use to do the symmetric encryption of the content. With OPENSSL it is not possible to encrypt a content which length is longer than the length of the key used for encryption. There are tons of articles about this subject in the internet available and everybody could make his own choice. Symmetric ciphers require that both parties (the sender and the receiver) have knowledge of the same key. It is not the final conclusion about securing the agent and I also don’t want to discuss what are the best ciphers to be used for encryption or what is the best key length. A key for both sides: opensslencrypt allows you to use various types of symmetric ciphers, for example DES, 3DES, AES, CAMELLIA. This article just show a concept how OPENSSL could be used to asymmetric encryption of the agent content. Nevertheless II provide here a secure solution using OPENSSL to encrypt agent output. Unjustly GPG has a bad reputation and is called complex and complicated, which is not really the case in my opinion. The project's technical decision making is managed by the OpenSSL Technical Committee (OTC) and the project governance is managed by the OpenSSL Management Committee (OMC). OPENSSL ENCRYPTO SOFTWAREI already wrote a How-To Article about asymmetric agent encryption with GNU GPG here: Asymmetric agent encryption with GNU PGP. The OpenSSL Project develops and maintains the OpenSSL software - a robust, commercial-grade, full-featured toolkit for general-purpose cryptography and secure communication.
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