Analysis of Encryption Theory and Security of E-mail System PGP
E-mail; PGP; Encryption and Decryption; Key ManagementE-mail is one of the tools that people use most frequently today in the Internet. Its security hasattached more and more attention. As the encryption standard of secure communications, PGPhas high security. After providing an overview of PGP, analyzes the algorithm of PGP and pro-cess of encrypting and decrypting E-mail in details and makes a brief discussion of PGP's se-cure performance.