< p class=" MsoNormal" > < span style=" mso-fareast-font-family: ' MS Mincho' " > This Recommendation | International Standard supplements Rec. ITU-T X.509 | ISO/ IEC 9594-8 and Rec. ITU-T X.510 | ISO/ IEC 9594-11 by providing an extended description of cryptographic algorithms and guidance in establishment and maintenance of a public-key infrastructure (PKI).< / span>

< p class=" MsoNormal" > < span style=" mso-fareast-font-family: ' MS Mincho' " > It is outside the scope of this Recommendation | International Standard to define new cryptographic algorithms, but it is within scope to discuss already-defined cryptographic algorithms that provide optimal protection, including future protection against attacks using powerful quantum computers.< / span>

< p class=" MsoNormal" > < span style=" mso-fareast-font-family: ' MS Mincho' " > This Recommendation | International Standard specifies how < / span> public-key infrastructure (< span style=" mso-fareast-font-family: ' MS Mincho' " > PKI) may be adapted to support < / span> machine-to-machine (< span style=" mso-fareast-font-family: ' MS Mincho' " > M2M) communication, e.g., smart grid and Internet of things (IoT), to allow interworking.< / span>

< p class=" MsoNormal" > < span style=" mso-fareast-font-family: ' MS Mincho' " > This Recommendation | International Standard specifies the procedures for establishment and maintenance of a PKI supporting new areas, such as intelligent electricity network (smart grid) and industrial Internet of things.< / span>