Crack 128-bit encryption almost instantly on your computer. Generate 32-bit up to 2048-bit keys to generate public and private keys on the mobilefish site. The modulus of the public key is just two large prime numbers multiplied together. By multiplying them on the alpertron site you can test the strength of the key by cracking it in java on your computer. You can also encrypt or decrypt using the keys on the mobilefish site. To multiply very large numbers, check if large numbers are prime, or do other high precision calculations maxima may help.