PEM and DER format change this to expect PEM and DER format CMS structures instead. The default is SMIME which reads an S/MIME format message. This specifies the input format for the CMS structure. The input message to be encrypted or signed or the message to be decrypted or verified. Functionality is otherwise similar to the -verify operation. The input message must contain the original receipt request. Verify a signed receipt in filename receipt. Functionality is otherwise similar to the -sign operation. The input message must contain a signed receipt request. Generate and output a signed receipt for the supplied message. EncryptedData_encryptĮncrypt content using supplied symmetric key and algorithm using a CMS EncrytedData type and output the content. OpenSSL must be compiled with zlib support for this option to work, otherwise it will output an error. Uncompress a CMS CompressedData type and output the content. compressĬreate a CMS CompressedData type. Verify a CMS DigestedData type and output the content. digest_createĬreate a CMS DigestedData type. data_createĭata type and output the content. Resign a message: take an existing message and one or more new signers. Takes an input message and writes out a PEM encoded CMS structure. Both clear text and opaque signing is supported. Expects a signed mail message on input and outputs the signed data. The signed message in MIME format is written to the output file. Sign mail using the supplied certificate and private key. This option should be used with caution: see the notes section below. This option sets the CMS_DEBUG_DECRYPT flag. The decrypted mail is written to the output file. Expects an encrypted mail message in MIME format for the input file. decryptĭecrypt mail using the supplied certificate and private key. Note that no revocation check is done for the recipient cert, so if that key has been compromised, others may be able to decrypt the text. The output file is the encrypted mail in MIME format. Input file is the message to be encrypted. encryptĮncrypt mail for the given recipient certificates. The meaning of the other options varies according to the operation type. There are fourteen operation options that set the type of operation to be performed. It can encrypt, decrypt, sign and verify, compress and uncompress S/MIME messages. The cms command handles S/MIME v3.1 mail. Public key cryptography was invented just for such cases.Įncrypt a file using a supplied password: $ openssl enc -aes-256-cbc -salt -in file.txt -out -k PASSĭecrypt a file using a supplied password: $ openssl enc -aes-256-cbc -d -in -out file.Openssl cms ]. If you are creating a BASH script, you may want to set the password in non interactive way, using -k option.Ĭool Tip: Need to improve security of the Linux system? Encrypt DNS traffic and get the protection from DNS spoofing! Read more → Warning: Since the password is visible, this form should only be used where security is not important.īy default a user is prompted to enter the password. Option -a should also be added while decryption: $ openssl enc -aes-256-cbc -d -a -in -out file.txt Non Interactive Encrypt & Decrypt Tells OpenSSL that the encrypted data is in Base64-ensode To encrypt file in Base64-encode, you should add -a option: $ openssl enc -aes-256-cbc -salt -a -in file.txt -out Option you have to save encrypted file in Base64-encode.Ĭool Tip: Want to keep safe your private data? Create a password protected ZIP file from the Linux command line. If you are going to send it by email, IRC, etc. It is needed for safe transport through e-mail systems, and other systems that are not 8-bit safe.īy default the encrypted file is in a binary format. Without the -salt option it is possible to perform efficient dictionary attacks on the password and to attack stream cipher encrypted data.īase64 encoding is a standard method for converting 8-bit binary information into a limited subset of ASCII characters. Warning: The -salt option should ALWAYS be used if the key is being derived from a password. Interesting fact: 256bit AES is what the United States government uses to encrypt information at the Top Secret level. HowTo: Encrypt a File $ openssl enc -aes-256-cbc -salt -in file.txt -out Options If you want to use the same password for both encryption of plaintext and decryption of ciphertext, then you have to use a method that is known as symmetric-key algorithm.įrom this article you’ll learn how to encrypt and decrypt files and messages with a password from the Linux command line, using OpenSSL. OpenSSL is a powerful cryptography toolkit that can be used for encryption of files and messages.
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