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Classification and Generation of Disturbance Vectors for Collision Attacks against SHA-1 (2011) - Manuel.pdf.gz

Freestart Collision for 76-step SHA-1 (2015) - Stevens et. al.pdf.gz

Freestart Collision for Full SHA-1 (2015) - Stevens, Karpman, Peyrin.pdf.gz

Note on Distinguishing, Forgery, and 2nd Preimage Attacks on HMAC-SHA-1 & a Method to Reduce the Key Entropy of NMAC (2006) - Rijmen.pdf.gz