RSA Encryption and Decryption: Creating Public and Private Keys for Secure Communication

[@totoramos1211]

You're amazing, greetings from México, Ajuuaa!!

[@prabhattiwari5964]

Hey can you make video on how to calculate the time of encryption or decryption does the aes, des, rsa algorithm take

[@WhiteBatCodes]

It's going to be a quick video because it's just using two dates, one before the execution and one after then calculating the difference between them.

[@preethimerlin6189]

Hi did you receive the answer?

[@Kamranazam53]

Hello, I have one question, if I already have EncryptedString (already encrypted by RSA), how I can use the same to Decrypt that. I tried but its not working. Please help in the same.

[@ZaKeRGFX]

Hello :) thanks for the video. Btw you forgot tu put the code in the description :p

[@WhiteBatCodes]

It does exist in the comments : www.thexcoders.net/java-ciphers-rsa/

[@shwetasoni3380]

Is it ok to use rsa encryption when message is too long ?

[@WhiteBatCodes]

No, there is a max size for each key_size. If you have a long string you need to split it

[@اسدالسنهحفيدعليوعمر]

thankn you

[@mayurmunot1146]

I need help for how to decrypt encrypted cipher text as my client send me a encrypted text in my response i want to decrypt that but dont know how to store that encrypted text and decrypt it

[@Kamranazam53]

hey , i also have same question, have you sorted it out? Please help in the solution.

[@technicalknowledge9128]

Can u read one file my java i want to help

[@leekokting9678]

can anyone copy source code to me?

[@InconnuO_O491]

there: import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.util.Base64; import javax.crypto.Cipher; public class RSA { private PrivateKey privateKey; public PublicKey publicKey; public RSA(){ try{ KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA"); generator.initialize(1024); KeyPair pair = generator.generateKeyPair(); privateKey = pair.getPrivate(); publicKey = pair.getPublic(); } catch(Exception ignored){ } } public String encrypt(String message) throws Exception{ byte[] messageToBytes = message.getBytes(); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] encryptedBytes = cipher.doFinal(messageToBytes); return encode(encryptedBytes); } private String encode(byte[] data){return Base64.getEncoder().encodeToString(data);} public String decrypt(String encryptedMessage) throws Exception{ byte [] encryptedBytes = decode(encryptedMessage); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE,privateKey); byte[] decryptedMessage = cipher.doFinal(encryptedBytes); return new String(decryptedMessage, "UTF-8"); } private byte[] decode(String data) {return Base64.getDecoder().decode(data);} public static void main(String[] args){ RSA rsa = new RSA(); try{ String encryptedMessage = rsa.encrypt("LOL "); String decryptedMessage = rsa.decrypt(encryptedMessage); System.err.println("Encrypted: "+encryptedMessage); System.err.println("Decrypted: "+decryptedMessage); }catch(Exception ignored){} } }