PKI Sequential Authentication Patent US12609842B2 Granted April 21 2026
Summary
The USPTO granted Patent US12609842B2 to inventor Unho Choi on April 21, 2026. The patent covers a method for sequential authentication using public key infrastructure (PKI), including generating private and public key pairs by users and service providers, transmitting and verifying level-n keys, and generating level (n+1) keys by concatenating the level-n key with the nth public key signed by the nth private key. The patent contains 20 claims and was filed on July 20, 2024.
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GovPing monitors USPTO Patent Grants - Business Methods (G06Q) for new banking & finance regulatory changes. Every update since tracking began is archived, classified, and available as free RSS or email alerts — 44 changes logged to date.
What changed
The USPTO granted Patent US12609842B2 to inventor Unho Choi on April 21, 2026. The patent covers a method for sequential authentication using PKI involving generation and transmission of sequential keys between users and service providers. The invention includes 20 claims broadly classified under H04L (digital communication) and G06Q (business methods).
Affected parties include technology companies and software developers working on authentication systems, secure communications platforms, and financial transaction verification. These parties should assess whether their products or methods implement similar PKI-based sequential authentication techniques to avoid potential infringement on the granted claims.
Archived snapshot
Apr 26, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Chain of authentication using public key infrastructure
Grant US12609842B2 Kind: B2 Apr 21, 2026
Inventors
Unho Choi
Abstract
A method for sequential authentication based on chain of authentication using public key infrastructure (PKI) is provided. The method includes generating, by a user, a first private key and a first public key corresponding to each other; generating, by an nth service provider, an nth private key and an nth public key corresponding to each other; transmitting, from the user to the nth service provider, a level n key; verifying, by the nth service provider, the level n key; generating, by the nth service provider, a level (n+1) key by concatenating the level n key and the nth public key signed with the nth private key; and transmitting, by the nth service provider, the level (n+1) key to the user, where n is a natural number, and when n=1, the level 1 key is the first public key signed with the first private key.
CPC Classifications
H04L 9/3268 H04L 9/0825 H04L 9/14 H04L 9/3231 H04L 9/3263 H04L 9/3265 H04L 9/50 H04L 2209/84 H04L 9/006 H04L 9/0891 H04L 9/3247 H04L 9/0643 H04L 9/088 B60L 53/30 B60L 2200/10 B60L 53/65 B60L 2260/32 G05D 1/0291 G05D 1/104 G05D 1/69 G05D 1/695 G06Q 10/0832 G06Q 20/227 G06Q 20/321 G06Q 20/3829 G06Q 20/389 G06Q 20/40145 G06Q 20/38215 G06Q 30/018 G06Q 20/065 G06Q 20/4015 Y02T 10/70 Y02T 10/7072 Y02T 90/12 Y02T 90/167 Y04S 30/14
Filing Date
2024-07-20
Application No.
18778925
Claims
20
Parties
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