In some examples, a storage medium stores a plurality of information elements that relate to corresponding virtual trusted platform module (TPM) interfaces, where each respective information element of the plurality of information elements corresponds to a respective virtual machine (VM). A controller provides virtual TPMs for respective security operations. A processor resource executes the VMs to use the information elements to access the corresponding virtual TPM interfaces to invoke the security operations of the virtual TPMs, where a first VM is to access a first virtual TPM interface of the virtual TPM interfaces to request that a security operation of a respective virtual TPM be performed.