Question

Is there any possibilty upload file with encripted and download file with decription key in multichain

Answer 1

There is certainly no problem storing encrypted data in MultiChain, e.g. using large stream items. But the encryption and decryption would be done by your application rather than by MultiChain itself.

Comments

How the encription is done by using large stream items, Can you Please help me to genrate encription key after upload the file.

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This is not really in the scope of this forum, because there are endless ways to generate encryption keys, and to encrypt/decrypt - it depends on the programming language and operating system you use. You can start by looking at openssl if you're using Linux.