The SHAppening: freestart collisions for SHA-1 Sitemap The SHAppening: freestart collisions for SHA-1 This website contains latest news and background information regarding the SHA-1 freestart collision work from Marc Stevens (CWI, the Netherlands), Pierre Karpman (Inria, France and NTU Singapore) and Thomas Peyrin (NTU Singapore). You can find the latest version of our technical article here (currently under submission) and the corresponding press release here . The following two input IV/message pairs give the same output value after applying the SHA-1 compression function: Input 1 IV1 50 6b 01 78 ff 6d 18 90 20 22 91 fd 3a de 38 71 b2 c6 65 ea M1 9d 44 38 28 a5 ea 3d f0 86 ea a0 fa 77 83 a7 36 33 24 48 4d af 70 2a aa a3 da b6 79 d8 a6 9e 2d 54 38 20 ed a7 ff fb 52 d3 ff 49 3f c3 ff 55 1e fb ff d9 7f 55 fe ee f2 08 5a f3 12 08 86 88 a9 SHA1_com...