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Jason Cooke 2Jason Cooke 2 

Does the Salesforce dataloader use SSL or TLS encryption?

We have a client with number of batch integrations built using the Salesforce data loader.  The data loader is connecting to Salesforce through a proxy server.

Is the data loader affected by the change being rolled out to disable SSL encryption?
I don't think this would work without SSL as dataloader connects to Salesforce API and the doc says ( supports only the Secure Sockets Layer (SSL) protocol SSLv3, the Transport Layer Security (TLS) protocol, and frontdoor.jsp. Ciphers must have a key length of at least 128 bits.
PratikPratik (Salesforce Developers) 
Hi Jason,

I think it uses SSL.

You can refer to this document:

Tomasz OczapowskiTomasz Oczapowski
Apex Data Loader uses TLS only. Salesforce plans to achieve compatibility with TLS 1.1 and TLS 1.2 by the end of the Spring '16 release (timeframe subject to change)   More info