Monthly Archives: January 2020

A few more notes regarding target collision resistant functions, following up from my $1000 competition announcement. Second preimage resistance There is a simple way to construct a secure TCR compression function given a second-preimage-resistant compression function—just generate a key which is the length of the input, and XOR the key with the input. So ifContinue reading “More thoughts on TCRs”

In my day job, I do cryptography for Android. I have a problem where I need to make some cryptography faster, and I’m setting up a $1000 competition funded from my own pocket for work towards the solution. On Android devices, key operating system components are stored in read-only partitions such as the /system partition.Continue reading “$1000 TCR hashing competition”