WPAPASSPHRASE(8) WPAPASSPHRASE(8)NAMEwpapassphrase - Generate a WPA PSK from an ASCII passphrase for a SSIDSYNOPSISwpapassphrase ssid passphrase OVERVIEWwpapassphrase pre-computes PSK entries for network configuration blocks of a wpasupplicant.conf file. If not included on the command line, passphrase will be read from standardinput.SEE ALSOwpasupplicant.conf(5) wpasupplicant(8)LEGALwpasupplicant is copyright (c) 2003-2012, Jouni Malinen and contributors. AnASCII passphrase and SSID are used to generate a 256-bit PSK.OPTIONSssid The SSID whose passphrase should be derived.passphraseThe passphrase to use. 
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You may generate an RSA private key with the help of this tool. Additionally, it will display the public key of a generated or pasted private key.
Description
RSA is an asymmetric encryption algorithm. With a given key pair, data that is encrypted with one key can only be decrypted by the other. This is useful for encrypting data between a large number of parties; only one key pair per person need exist. RSA is widely used across the internet with HTTPS.
To generate a key pair, select the bit length of your key pair and click Generate key pair. Depending on length, your browser may take a long time to generate the key pair. A 1024-bit key will usually be ready instantly, while a 4096-bit key may take up to several minutes. For a faster and more secure method, see Do It Yourself below.
CryptoTools.net does not yet have a tool for facilitating the encryption and decryption of data using RSA, but you may Do It Yourself with the instructions below.
Do It Yourself
Rsa 2048 Bit Encryption
For these steps, you will need a command line shell with OpenSSL. Ideally, you should have a private key of your own and a public key from someone else. For demonstration, we will only use a single key pair.
Generate Private Key
Run this command to generate a 4096-bit private key and output it to the private.pem file. If you like, you may change the key length and/or output file.
2048 Bit Key Encryption
Derive Public Key
2048 Bit Key Generator online, free
Given a private key, you may derive its public key and output it to public.pem using this command. (You may also paste your OpenSSL-generated private key into the form above to get its public key.)
Encrypt Data
We can now use this key pair to encrypt and decrypt a file, data.txt.
Decrypt Data
Given the encrypted file from the previous step, you may decrypt it like so.