Paulus Pärssinen @paulusparssinen

A tuxedo cat is peacefully sleeping while holding a small plush that looks just like him, covered with a white blanket featuring paw prints and his own image

Sweet dreams with Mini Uni

05.10.2025 13:12 — 👍 10329 🔁 1917 💬 92 📌 39

Classical cryptography gets so little attention nowadays outside niche circles.. I'm big fan of these!

02.09.2025 19:40 — 👍 0 🔁 0 💬 0 📌 0

1965 Cryptanalysis Training Workbook Released by the NSA In the early 1960s, National Security Agency cryptanalyst and cryptanalysis instructor Lambros D. Callimahos coined the term "Stethoscope" to describe a diagnostic computer program used to unravel the internal structure of pre-computer ciphertexts. The term appears in the newly declassified September 1965 document Cryptanalytic Diagnosis with the Aid of a Computer, which compiled 147 listings from this tool for Callimahos's…

1965 Cryptanalysis Training Workbook Released by the NSA

In the early 1960s, National Security Agency cryptanalyst and cryptanalysis instructor Lambros D. Callimahos coined the term "Stethoscope" to describe a diagnostic computer program used to unravel the internal structure of pre-computer…

02.09.2025 11:09 — 👍 12 🔁 7 💬 2 📌 0

Declassified CIA graphic from the 1980s that shows the Soviet military (and intelligence) presence abroad.

07.07.2025 17:07 — 👍 11 🔁 7 💬 0 📌 0

Recently declassified by the #NSA, an internal study from 1988 titled: "Fifty Years of Mathematical Cryptanalysis (1937-1987)" www.governmentattic.org/58docs/NSA50...

27.05.2025 08:53 — 👍 14 🔁 8 💬 0 📌 1

Manual intercept operator, on duty with the War Office Y Group (WOYG) during the Second World War (from HW41/119)

29.05.2025 15:14 — 👍 6 🔁 4 💬 0 📌 0

In Memoriam: John L. Young, Cryptome Co-Founder John L. Young, who died March 28 at age 89 in New York City, was among the first people to see the need for an online library of official secrets, a place where the public could find out things that g...

In memoriam: Cryptome co-founder John L. Young, who died March 28 at age 89 in New York City, was one of the early, under-recognized heroes of the digital age.

15.05.2025 21:32 — 👍 125 🔁 41 💬 2 📌 4