Data encryption at rest is a must-have for any modern Internet company. Many companies, however, don't encrypt their disks, because they fear the potential performance penalty caused by encryption overhead. Encrypting data at rest is vital for Cloudflare with more than 200 data centres across the world. In this post, we will investigate the performance of disk encryption on Linux and explain how w
Guide to perform a full disk encryption of the SD Card of a Raspberry Pi running Raspberry Pi OS View on GitHub LUKS on Raspberry Pi Last updated: February 2021. This guide explains how to encrypt the root partition of an SD Card with Raspberry Pi OS with LUKS. The process requires a Raspberry Pi running Raspberry Pi OS on the SD Card and a USB memory with the same capacity as the SD Card at least
Reversing an integer hash function This is an integer hash function written by Thomas Wang: uint32_t hash6432shift(uint64_t key) { key = (~key) + (key << 18); key ^= key >> 31; key *= 21; key ^= key >> 11; key += key << 6; key ^= key >> 22; return 0xFFFFFFFF & key; } It hashes down a 64-bit input to a 32-bit output. It has good mixing: basic statistical analysis can show that it has reasonably goo
Use Canokey-STM32 as an example. You need to implement these functions in device.h: void device_delay(int ms); uint32_t device_get_tick(void); int device_spinlock_lock(volatile uint32_t *lock, uint32_t blocking); void device_spinlock_unlock(volatile uint32_t *lock); int device_atomic_compare_and_swap(volatile uint32_t *var, uint32_t expect, uint32_t update); void led_on(void); void led_off(void);
Botan (Japanese for peony flower) is a cryptography library released under the permissive Simplified BSD license. Botan's goal is to be the best option for production cryptography by offering the tools necessary to implement a range of practical systems, such as TLSv1.3, X.509 PKI, modern AEAD ciphers, support for PKCS#11 and TPM hardware, memory-hard password hashing, and post quantum cryptograph
Spiped (pronounced "ess-pipe-dee") is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses, so that one may connect to one address (e.g., a UNIX socket on localhost) and transparently have a connection established to another address (e.g., a UNIX socket on a different system). This is similar to 'ssh -L' functionality, but does not use SSH and requires a
In most cryptographic functions, the key length is an important security parameter. Both academic and private organizations provide recommendations and mathematical formulas to approximate the minimum key size requirement for security. Despite the availability of these publications, choosing an appropriate key size to protect your system from attacks remains a headache as you need to read and unde
In my day job, I work in the Arm Development Solutions Group, developing Arm Compiler and its supporting tools. In my spare time, I’m also the lead developer of the free SSH client PuTTY. Recently, Windows on Arm has been making a splash, so last year I did a little porting work to get WoA builds of PuTTY. This year, I’ve gone a little further, and optimised the cryptography code using the Arm v8
Notice: This site and associated project has been temporarily suspended due to U.S. federal funding cuts and delays that have negatively impacted our research group and this project. We apologize for the outage, and hope to be able to bring this project back online in the future, pending funding. TLS Fingerprint We collect anonymized TLS Client Hello messages from the University of Colorado Boulde
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