Explore wide-block cipher support and HCTR2 in this 26-minute conference talk by Nathan Huckleberry from Google. Delve into the limitations of narrow-block ciphers like AES-XTS for storage encryption and discover why wide-block ciphers are better suited for this purpose. Learn about HCTR2, a new wide-block encryption mode being added to the Linux Crypto API, and its advantages in providing more secure storage encryption with minimal performance loss. Gain insights into the background of wide-block cipher modes, Linux's wide-block cipher support, HCTR2's design, and its application to filename encryption in ext4 and f2fs filesystems. Understand the importance of IV reuse in disk and filename encryption, the differences between narrow and wide block sector modifications, and the concept of tweakable PRPs and SPRPs.