The lower-risk approach to migrating to post-quantum cryptography is to adopt hybrid ciphersuites consisting of ________.

Question

BlackTom AI · Accepted Answer

Consider the goal of a gradual, lower-risk transition to post-quantum cryptography by combining old and new algorithms in a single handshake.
Option a: 'a. one traditional public-key algorithm and one PQC algorithm' - This aligns with the typical hybrid approach, where a legacy public-key method is used alongside a PQC method to ensure interoperability and a fallback path if PQC components prove problematic. It preserves compatibility with existing systems while introducing a PQC element.
Option b: 'b. two lattice-based PQC algorithms' - This would be two PQC algorithms, both being post-quantum, and does not retain the traditional algorithm as part of the hybrid; it aims for quantum resistance but not the lower-risk, compatibility-preserving hybrid structure.
Option c: 'c. one ephemeral key exchange and one digital signature algorithm' - Ephemeral key exchange and a digital signature are components of cryptographic protocols, but this description does not specify a mix of traditional and PQC algorithms in the required hybrid form, making the statement too vague and not necessarily ensuring post-quantum compatibility.
Option d: 'd. one key-encapsulation mechanism (KEM) and one digital signature algorithm' - While this option describes a common PQC-friendly pairing (a KEM with a digital signature) typically used in PQC contexts, it does not explicitly involve a traditional public-key algorithm alongside a PQC component, which is central to the lower-risk hybrid approach described in practice.
In summary, option a captures the intended hybrid strategy: maintain a familiar traditional public-key algorithm for widespread compatibility while introducing a PQC algorithm to gain quantum resistance, thereby reducing risk during migration. The other options either rely entirely on PQC components without a traditional counterpart, use vague phrasing, or omit the key element of combining traditional and PQC algorithms in a single hybrid suite.

The lower-risk approach to migrating to post-quantum cryptography is to adopt hybrid ciphersuites consisting of ________.单项选择题

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