US Patent 9596076 Encrypted data exchange between computer systems

Aspects include encrypting data exchanged between two computer systems. A method includes accessing content of a memory, via a memory address, by at least one processing unit of one of the computer systems. Based on the accessing being a write operation, the content of the memory is encrypted using a memory encryption key, the encrypting is by a crypto unit of the at least one of the processing units. Based on the accessing being a read operation, the content of the memory is decrypted using the same memory encryption key, the decrypting is by a crypto unit of the at least once of the processing units. Remote direct memory access is established via memory addresses between the computer systems, the establishing including at least one of the computer systems locally storing a respective network encryption key as memory encryption keys for memory areas used for the data exchange.