![]() Using a passphrase without explicit salt given using -S option), theįirst bytes of the encrypted data are reserved to store the salt for later When the salt is generated at random (that means when encrypting Password always generates the same encryption key. The reason for this is that without the salt the same Without the -salt option it is possible to performĮfficient dictionary attacks on the password and to attack stream cipherĮncrypted data. ![]() The -salt option should ALWAYS be used if the key isīeing derived from a password unless you want compatibility with previous When the enc command lists supported ciphers, ciphers provided byĮngines, specified in the configuration files are listed too.Ī password will be prompted for to derive the key and IV if Of ciphers which are supported by the OpenSSL core or another engine engine option can only be used for hardware-assisted implementations Engines specified on the command line using The ccgost engine which provides gost89 algorithm) should be configured in Use the openssl-list(1) command to get a list of supportedĮngines which provide entirely new encryption algorithms (such as Is processed before the configuration file is read and any ENGINEs loaded. The first form doesn't work with engine-provided ciphers, because this form The program can be called either as "openssl engine id See "Engine Options" in openssl(1). provider name -provider-path path -propquery propq See "Provider Options" in openssl(1), provider(7),Īnd property(7). writerand file See "Random State Options" in openssl(1) forĭetails. none Use NULL cipher (no encryption or decryption of input). This option exists only if OpenSSL was compiled with z Compress or decompress encrypted data using zlib after encryption orīefore decryption. v Verbose print display some statistics about I/O and buffer sizes. bufsize number Set the buffer size for I/O. P Print out the key and IV used then immediately exit: don't do anyĮncryption or decryption. Using one of the other options, the IV is generated from this When only the key is specified using the -K option, iv IV The actual IV to use: this must be represented as a string comprised only Generated from the password will be taken. Specified, the key given with the -K option will be used and the IV If only the key is specified, the IV must additionally K key The actual key to use: this must be represented as a string comprised only If this option is used while encrypting, the same exact value willīe needed again during decryption. S salt The actual salt to use: this must be represented as a string of hexĭigits. salt Use salt (randomly generated or provide with -S option) whenĮncrypting, this is the default. NOT be used except for test purposes or compatibility with ancient ![]() nosalt Don't use a salt in the key derivation routines. pbkdf2 Use PBKDF2 algorithm with default iteration count unless otherwise This option enables the use of PBKDF2 algorithm to derive High values increase the time required to brute-force the iter count Use a given number of iterations on the password in deriving theĮncryption key. md digest Use the specified digest to create the key from the passphrase. This is for compatibility with previous versions of kfile filename Read the password to derive the key from the first line ofįilename. k password The password to derive the key from. base64 Same as -a -A If the -a option is set then base64 process the data on one Input data is base64 decoded before being decrypted. This means that if encryption is taking place theĭata is base64 encoded after encryption. e Encrypt the input data: this is the default. For more information about the format of arg out filename The output filename, standard output by default. in filename The input filename, standard input by default. ciphers Alias of -list to display all supported ciphers. Performed either by itself or in addition to the encryption orĭecryption. The symmetric cipher commands allow data to be encrypted orĭecrypted using various block and stream ciphers using keys based on Openssl-enc - symmetric cipher routines SYNOPSIS ¶
0 Comments
Leave a Reply. |