Is this a real patent?

Yes — the original drawing as filed at the U.S. Patent Office, cleaned and printed. Public domain by law.

Printed in Europe on 200 g/m² matte paper. Small sizes ship flat, 50 × 70 ships rolled in a tube. Tracking by email.

What if it arrives damaged?

Send a photo within 7 days and we reprint and reship it free.

US 4,405,829Cryptographic communications system and method1983

PD-100 · US 4,405,829

Name: Cryptographic communications system and method Patent Print (1983)
Brand: PATENT DEPT.
SKU: PD-100
Availability: InStock

The RSA public-key cryptosystem, 1983 — Rivest, Shamir and Adleman's math that secures the internet.

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PD-100 · US 4,405,829 · Filed December 14, 1977 ·

Is this a real patent?: Yes — the original drawing as filed at the U.S. Patent Office, cleaned and printed. Public domain by law.
How is it shipped?: Printed in Europe on 200 g/m² matte paper. Small sizes ship flat, 50 × 70 ships rolled in a tube. Tracking by email.
What if it arrives damaged?: Send a photo within 7 days and we reprint and reship it free.