1) as the communication between the parties A and B, have a common trusted third party CA, the CA public key generated for each person and the corresponding private key and distributed to A, B. (2) A and B, respectively, their own public key available to the other, then A with B s public key to encrypt a data X (integer, can define their own, such as 100) and sent to B, B with their own private key to decrypt data obtained after X, then press the agreed-function F (eg F (X) = 2* X) calculated from F (X), then use a s public key encrypted and sent to a A locally with their own private key decrypted to get F (x), in the same local calculated F (X) for comparison, if the same, indicating the success of public-key distribution. (3) A with B s public key for an image file (test_pig.bmp) is encrypted and sent to B, B to decrypt the receipt, compared to the original image to see if the same, and record the entire encryption/decryption time T1 used

Lab1_3_1\.classpath
........\.project
........\bcprov-jdk14-123.jar
........\receive.bmp
........\src\CA$CAThread.class
........\...\CA.class
........\...\CA.java
........\...\RSAUtil.class
........\...\RSAUtil.java
........\...\Test.class
........\...\Test.java
........\...\UserA$1.class
........\...\UserA$RegisterThread.class
........\...\UserA.class
........\...\UserA.java
........\...\UserB$1.class
........\...\UserB$RegisterThread.class
........\...\UserB$WaitThread.class
........\...\UserB.class
........\...\UserB.java
........\test_pig.bmp
........\说明.txt
........\src
Lab1_3_1

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