Application of Large-Number Operation in Network Safety
Song Cui · Ordnance Industry Automation · 2007
The application of large-number operation in network safety takes the RSA algorithm for example. If the plaintext is P, encryption algorithm is E, decryption algorithm is D, find two prime numbers in certain condition, which can be transformed as n, d, and e. Then it can complete decrypting cipher text and getting cipher text through calculation. D and e can be exchanged. The public key is made up of n and d, private key is made up of n and e in the unsymmetrical system, e is kept by oneself. It can be encrypted with e and d when sending and receiving message. But only e can be used as decrypting. The safety of RSA depends on the large-number n, because there is no effective way to decompose it. So it can assure the safety of cipher text.