RSA(Rivest-Shamir-Adleman)
is an Asymmetric encryption
technique that uses two different keys as public and private keys to perform the
encryption and decryption. With RSA, you can encrypt sensitive information with a
public key and a matching private key is used to decrypt the encrypted message.
Asymmetric encryption is mostly used when there are 2 different endpoints are
involved such as VPN client and server, SSH, etc.
Below is an online tool to perform RSA encryption and decryption as a RSA
calculator.
For Java implementation of RSA, you can follow
this
article
.
First, we require public and private keys for RSA encryption and decryption. Hence,
below is the tool to generate RSA key online. It generates
RSA public key
as well as the private key
of size 512 bit, 1024 bit, 2048 bit, 3072 bit and
4096 bit with
Base64
encoded
.
By default, the private key is generated in
PKCS#8
format and the public key is generated in
X.509 format
.
RSA Encryption and Decryption Online
Below is the tool for encryption and decryption. Either you can use the public/private
keys generated above or supply your own public/private keys.
Any private or public key value that you enter or we generate is not stored on
this site,
this tool is provided via an HTTPS URL to ensure that private keys cannot be
stolen.
This tool provides flexibility for RSA encrypt with public key as well as private key
along with RSA decrypt with public or private key.
If you appreciate this tool then you Can Consider:
Usage Guide
RSA Public and Private Keys
In the first section of this tool, you can generate public and private keys. The private key is used to generate digital signatures,
and the public key is used to verify the digital signatures.
To generate the keys, select the RSA key size among 515, 1024, 2048 and 4096 bit and then click on the button to generate the keys for you.
Since 2015, NIST recommends a minimum of 2048-bit keys for RSA. A 4096 bit key size does provide a reasonable increase in strength over a 2048 bit key size but the encryption strength doesn't drop off after 2048 bits.
There's a significant increase in CPU usage as a result of a 4096 bit key size. Hence, it is recommended to use 2048-bit keys.
RSA Encryption
For encryption and decryption, enter the plain text and supply the key. As the encryption
can be done using both the keys, you need to tell the tool about the key type that you
have supplied with the help of a radio button. By default, public key is selected. Then,
you can use the cipher type to be used for the encryption. The different cipher options
RSA/ECB/PKCS1Padding
and
RSA/ECB/OAEPWithSHA-1AndMGF1Padding
. Now, once you click the
encrypt button the encrypted result will be shown in the textarea just below the
button.
Remember, the encrypted result is by default base64 encoded.
RSA Decryption
Similarly, for decryption the process is the same. Here, you need to enter the RSA encrypted
text and the result will be a plain-text. You have both the options to decrypt the
encryption with either public or private keys.
References
RSA Wiki
Cryptography: RSA Algorithm
