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The term "Trojan VPN" is not a widely recognized term in the context of VPNs (Virtual Private Networks). However, it may refer to a specific type of VPN or a cipher used in some VPNs. If you're referring to a VPN called "Proton", it is a well-known and highly regarded VPN that uses a cipher based on the Whirlpool hash function. Proton is designed to provide secure internet access, particularly for gaming and online activities, by encrypting data at rest and in transit. If you're looking for a VPN with similar features, you can check out the Proton VPN website or explore other VPNs like Surfshark, NordVPN, or OpenVPN, which also use various encryption technologies.