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hello my name is tomapera from ntu singapore and this is a joint work with gay tornaron from indonesia in france our work is entitled show one is shambles and in this work we show the first chosen prefix collision on the sha1 hash function and we give an application for this by attacking the pgp web of trust and we have a companion website that you can click on on the bottom if you want more data if you want more information about our work before i start explaining our results i would like to quickly mention what is the hash function so a hash function is simply a function that takes rb trial on input and outputs a fixed size hash value so typically the hash value will be of n bit where n is equal to 128 bits thatamp;#39;s what the case for md5 hash function otherwise 160 bit is common because itamp;#39;s using the shawanash function that we are studying today and nowadays we want bigger output values such as 256 bits now a hash function in cryptography domain has to follow several s
