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#NSA

Found 2 articles with this tag.

A visual representation of the Simon and Speck Algorithms
Block Ciphers Intermediate

The Simon and Speck Algorithms

Simon and Speck are two lightweight block ciphers released by the NSA in 2013 for tiny devices. Learn how Simon gets by on AND, rotate, and XOR, how Speck uses add, rotate, and XOR, and why they became some of the most debated ciphers ever published.

A visual representation of the Skipjack Algorithm
Block Ciphers Intermediate

The Skipjack Algorithm

Skipjack was the secret NSA cipher inside the Clipper chip, declassified in 1998. Learn how its 32 rounds of alternating rules work on four 16-bit words, and why its 80-bit key and its history make it a cautionary tale.