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ounsworth committed Jul 24, 2024
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Expand Up @@ -3,7 +3,7 @@ title: "Post-Quantum Cryptography for Engineers"
abbrev: "PQC for Engineers"
category: info

docname: draft-ietf-pquip-pqc-engineers-04
docname: draft-ietf-pquip-pqc-engineers-latest
submissiontype: IETF
number:
date:
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# Invariants of Post-Quantum Cryptography

In the context of PQC, symmetric-key cryptographic algorithms are generally not directly impacted by quantum computing advancements. Symmetric-key cryptography, which includes keyed primitives such as block ciphers (e.g., AES) and message authentication mechanisms (e.g., HMAC-SHA2), rely on secret keys shared between the sender and receiver. Symmetric cryptography also includes hash functions (e.g., SHA-256) that are used for secure message digesting without any shared key material. HMAC is a specific construction that utilizes a cryptographic hash function (such as SHA-2) and a secret key shared between the sender and receiver to produce a message authentication code.

CRQCs, in theory, do not offer substantial advantages in breaking symmetric-key algorithms compared to classical computers meaning that current symmetric algorithms can continue to be used with potentially small increases to key size to stay ahead of quantum-boosted brute-forcing attacks (see {{symmetric}} for more details).

# NIST PQC Algorithms
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