Does Java Support Signing

Hello All:
I want to develop a application which would sign the file that need to be passed through unsecure channel.
Does Java support the same.
Regards
Ritesh

Dear Sir:
Thanks for the mail.Well last time I did send you a source code of the Encryption/Decryption of a text file.I want to store the file type of the file in a appropriate way instead of using Encrypting the extension.
And after the encryption ,I want to modify the application to have the content of the complete file to signed.I would request you to advice me whether the complete file content is signed or just the generated key for encryption.
Let me hear from you.
regards
Ritesh

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