Thread: security(encrypt/decrypt) across machines

hi ,
i am using AES/CBC/PKCS5Padding algorithm to encrypt/decrypt,
it works fine across machines, since i am not using a Facrtory to create the secret .
i am using constant SecretKeySpec and iv for the ciphers.
this of course heart the security , and doesn't prevent the "man of the middle" problem .
i saw that there are ways with key generation with MAC , and RSA symmetric encryption , but i am not sure
how to implement it , and how to it depends on local certificates or files .
i have searched for an complete example , but in vain.
please help

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Thanks.

i didn't post code ....
i just asked a question....
i need a good,encrypted way , that does not use a constant string for the secret key (that is needed for the SecretKeySpec).
i saw that there is the RSA way (keyPair generation) and the MAC way (generate some key too .
the question is : if i generate a key is the machine that does encryption - then in the decrypting machine i won't be able to decrypt it .
i will need the key .
so - what is the better way to generate some random key , but still be able to decrypt it on another machine ? (question mark...:-))