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2 add homomorphic encryption as it's central to the question
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How do Cloud Encryption Gateways and CASB work?

Cloud Encryption Gateways (CEG) and Cloud Access Security Brokers(CASB) are becoming popular to ensure the security and confidentiality of the data leaving to Cloud Service Providers. How do they provide such services on the data leaving the organization at the gateway ? Do they do TLSProxy/SSLProxy for the traffic ?