Cryptography Tutorials - Herong's Tutorial Examples - Version 5.36, by Dr. Herong Yang
Testing RsaKeyEncryption.java with a 3072-bit Key
This section provides a tutorial example on testing my RSA encryption and decryption implementation using the java.math.BigInteger class with a 3072-bit key.
In the last test, I want to try my RSA encryption and decryption implementation on a large key, 3072-bit key:
C:\herong>java RsaKeyGeneration 3072 > rsa_3072.key C:\herong>type rsa_3072.key p: 128081139829885235542800955228499173923808960750433007737693766... q: 128081139829885235542800955228499173923808960750433007737693766... m: 164047783801226141039199633638385807841290101177468164207580823... Modulus: 164047783801226141039199633638385807841290101177468164207... Key size: 3071 Public key: 115818800736950873270224324475859346802845181289027278... Private key: 26148129677654121464582186764022283148199863115635111...
The first test uses the same hello.text file:
C:\herong>java RsaKeyEncryption rsa_3072.key hello.text hello.encrypted --- Reading public key --- Modulus: 164047783801226141039199633638385807841290101177468164207... Key size: 3071 Public key: 115818800736950873270224324475859346802845181289027278... Cleartext block size: 256 Ciphertext block size: 384 Encryption block count: 1 C:\herong>java RsaKeyDecryption rsa_3072.key hello.encrypted hello.decrypted --- Reading private key --- Modulus: 164047783801226141039199633638385807841290101177468164207... Key size: 3071 Private key: 26148129677654121464582186764022283148199863115635111... Cleartext block size: 256 Ciphertext block size: 384 Decryption block count: 1 C:\herong>type hello.decrypted Hello world!
My RSA encryption and decryption implementation has no problem with large RSA keys. Now repeating the test on the same binary file:
C:\herong>java RsaKeyEncryption rsa_64.key my_xcopy.exe my_xcopy_exe.encrypted C:\herong>java RsaKeyEncryption rsa_3072.key my_xcopy.exe my_xcopy_exe.encrypted --- Reading public key --- Modulus: 164047783801226141039199633638385807841290101177468164207... Key size: 3071 Public key: 115818800736950873270224324475859346802845181289027278... Cleartext block size: 256 Ciphertext block size: 384 Encryption block count: 145 C:\herong>java RsaKeyDecryption rsa_3072.key my_xcopy_exe.encrypted my_xcopy_decrypted.exe --- Reading private key --- Modulus: 164047783801226141039199633638385807841290101177468164207... Key size: 3071 Private key: 26148129677654121464582186764022283148199863115635111... Cleartext block size: 256 Ciphertext block size: 384 Decryption block count: 145 C:\herong>comp my_xcopy.exe my_xcopy_decrypted.exe Comparing my_xcopy.exe and my_xcopy_decrypted.exe... Files compare OK
No problem. My RSA encryption and decryption implementation works with large RSA keys too. But the encryption took about 2 minutes to finish on my computer.
Last update: 2013.
Table of Contents
Introduction to AES (Advanced Encryption Standard)
DES Algorithm - Illustrated with Java Programs
DES Algorithm Java Implementation
DES Algorithm - Java Implementation in JDK JCE
DES Encryption Operation Modes
PHP Implementation of DES - mcrypt
Blowfish - 8-Byte Block Cipher
Secret Key Generation and Management
Cipher - Secret Key Encryption and Decryption
►RSA Implementation using java.math.BigInteger Class
Generating Prime Number with BigInteger Class
Performance of Prime Number Generation
RSA Encryption Implementation using BigInteger Class
RsaKeyGenerator.java for RSA Key Generation
RSA Keys Generated by RsaKeyGenerator.java
RsaKeyValidator.java for RSA Key Validation
64-bit RSA Key Validated by RsaKeyValidator.java
Converting Byte Sequences to Positive Integers
Cleartext Block Size for RSA Encryption
Cleartext Message Padding and Revised Block Size
Ciphertext Block Size for RSA Encryption
RsaKeyEncryption.java for RSA Encryption Operation
RsaKeyDecryption.java for RSA Decryption Operation
Testing RsaKeyEncryption.java with a 16-bit Key
Testing RsaKeyEncryption.java with a 64-bit Key
►Testing RsaKeyEncryption.java with a 3072-bit Key
Introduction of DSA (Digital Signature Algorithm)
Java Default Implementation of DSA
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Cipher - Public Key Encryption and Decryption
OpenSSL Introduction and Installation
OpenSSL Generating and Managing RSA Keys
OpenSSL Generating and Signing CSR
OpenSSL Validating Certificate Path
"keytool" and "keystore" from JDK
"OpenSSL" Signing CSR Generated by "keytool"
Migrating Keys from "keystore" to "OpenSSL" Key Files
Certificate X.509 Standard and DER/PEM Formats
Migrating Keys from "OpenSSL" Key Files to "keystore"
Using Certificates in IE (Internet Explorer)