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FIPS 180 published it in 1993, the NSA withdrew it soon after without naming the flaw, and SHA-1 arrived in 1995 with exactly one change: a one-bit rotation in the message schedule. Same constants, same eighty steps, completely different digests.",[158,162,163],{},"That bit mattered. Chabaud and Joux described a collision attack in 1998, a full collision followed in 2004, and in 2005 Wang, Yin and Yu cut the cost to about 2^39 operations.",[165,166,171],"pre",{"className":167,"code":168,"language":169,"meta":170,"style":170},"language-ts shiki shiki-themes hashes hashes hashes","create(\"sha0\").hash(\"abc\").digest; \u002F\u002F \"0164b8a914cd2a5e74c4f7ff082c4d97f1edf880\"\ncreate(\"sha0\").hash(\"\").digest; \u002F\u002F \"f96cea198ad1dd5617ac084a3d92c6107708c0ef\"\n","ts","",[172,173,174,209],"code",{"__ignoreMap":170},[175,176,179,183,187,191,194,197,199,202,205],"span",{"class":177,"line":178},"line",1,[175,180,182],{"class":181},"sK71F","create",[175,184,186],{"class":185},"s38Sx","(",[175,188,190],{"class":189},"shU9J","\"sha0\"",[175,192,193],{"class":185},").",[175,195,196],{"class":181},"hash",[175,198,186],{"class":185},[175,200,201],{"class":189},"\"abc\"",[175,203,204],{"class":185},").digest; ",[175,206,208],{"class":207},"scIB-","\u002F\u002F \"0164b8a914cd2a5e74c4f7ff082c4d97f1edf880\"\n",[175,210,212,214,216,218,220,222,224,227,229],{"class":177,"line":211},2,[175,213,182],{"class":181},[175,215,186],{"class":185},[175,217,190],{"class":189},[175,219,193],{"class":185},[175,221,196],{"class":181},[175,223,186],{"class":185},[175,225,226],{"class":189},"\"\"",[175,228,204],{"class":185},[175,230,231],{"class":207},"\u002F\u002F \"f96cea198ad1dd5617ac084a3d92c6107708c0ef\"\n",[158,233,234,235,238,239,242],{},"Node's OpenSSL doesn't have it and neither does Python's ",[172,236,237],{},"hashlib",", which is exactly why a puzzle author reaches for it. Here it's for the exercise sheet, the 1998 paper and that puzzle. 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Withdrawn within two years and fully collided in 2004. Here for old papers and puzzles and it has HMAC","md",null,{},true,{"title":120,"description":249},"jy0ogw3kKHH6046acgnQy9vHv1oEfVhZjHXyvgyjGaE",[257,259],{"title":116,"path":117,"stem":118,"description":258,"children":-1},"A 160-bit hash broken by SHAttered in 2017. Still inside Git and old systems and it has HMAC",{"title":124,"path":125,"stem":126,"description":260,"children":-1},"The error-detection checksum in every ZIP and PNG and gzip. Four bytes and useless against an attacker",1790787317822]