Why 256 bit keys are long enough. A nice graphic explanation by Schneier why brute-force attacks against 256-bit keys will be infeasible until computers are built from something other than matter and occupy something other than space. [more inside]
"Few false ideas have more firmly gripped the minds of so many intelligent men than the one that, if they just tried, they could invent a cipher that no one could break."
AES may have been broken. The new standard in crypto, AES, and other algorithms, appear to be vulnerable to xsl. This is not a practical attack, yet, but if you're interested in crypto it's fascinating (and shocking) news.