# Crypto Challenge Set 7

This is **the first of two sets we generated after the original 6**.

Unlike the last few sets, **this set is a hodge-podge**. It also
includes some of the few challenges we have that probably aren't
useful against real targets (they were fun enough to include anyways).
On the other hand, we also include a challenge that models the CRIME
attack on TLS.

This set is **hard**. There's a significant amount of programming, and
Wang's attack in particular is as difficult as anything we've done.

49. [CBC-MAC Message Forgery](https://depp.brause.cc/cryptopals/07/49.md)
50. [Hashing with CBC-MAC](https://depp.brause.cc/cryptopals/07/50.md)
51. [Compression Ratio Side-Channel Attacks](https://depp.brause.cc/cryptopals/07/51.md)
52. [Iterated Hash Function Multicollisions](https://depp.brause.cc/cryptopals/07/52.md)
53. [Kelsey and Schneier's Expandable Messages](https://depp.brause.cc/cryptopals/07/53.md)
54. [Kelsey and Kohno's Nostradamus Attack](https://depp.brause.cc/cryptopals/07/54.md)
55. [MD4 Collisions](https://depp.brause.cc/cryptopals/07/55.md)
56. [RC4 Single-Byte Biases](https://depp.brause.cc/cryptopals/07/56.md)