--- title: "Practical Collision Attack Against Long Key IDs in PGP" url: https://daily.dev/posts/practical-collision-attack-against-long-key-ids-in-pgp-5z2lny5m6 source_url: https://soatok.blog/2026/01/07/practical-collision-attack-against-long-key-ids-in-pgp/ type: article source: "Dhole Moments" published: 2026-01-07T19:12:40.241Z updated: 2026-01-07T19:13:16.708Z tags: ["security", "cryptography"] reading_time: 3 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Practical Collision Attack Against Long Key IDs in PGP **[Dhole Moments](https://daily.dev/sources/soatok)** · 3 min read · 0 upvotes · 0 comments ## Summary A practical demonstration of a collision attack against PGP's 64-bit Long Key IDs, achieved in 3 days on a laptop using birthday attack principles. Two different PGP keypairs were generated that share the same Long Key ID (948F9326DD647C78), exploiting the mathematical reality that 64-bit outputs require only ~2^32 attempts for 50% collision probability. The attack methodology involved generating keypairs, iterating timestamps, computing Key IDs, sorting results, and identifying collisions. Complete proof-of-concept code and both public and private keys are provided, demonstrating that empirical security claims about 64-bit identifiers are fundamentally flawed. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#security](https://daily.dev/tags/security), [#cryptography](https://daily.dev/tags/cryptography) [View this post on daily.dev](https://daily.dev/posts/practical-collision-attack-against-long-key-ids-in-pgp-5z2lny5m6)