Decrypt and break the following base64 encoding + hash combination and connect via SSH to the target machine. The disclosed value is the password. 

Note that the target's SSH is configured to support only a specific cipher 

 and will not work unless this is specified in the SSH command.

 and the flag can be found on the target machine.


Cryptography - Final exercise

Decrypt and break the following base64 encoding + hash combination and connect via SSH to the target machine. The disclosed value is the password. **Note that the target's SSH is configured to support only a specific cipher ** and will not work unless this is specified in the SSH command.

The SSH username is **ubuntu** and the flag can be found on the target machine.

```sh
ODUwNjRlZmI2MGE5NjAxODA1ZGNlYTU2ZWM1NDAyZjc=
```

@exercise 42eef82c03ec


Cryptography - Learned Practice

From the history of cryptography to current use, the basics of encryption, technologies, applications and their impact on security.

Welcome to Hakatemia's cryptography course!

In this course, we will go through the basics of cryptography, the most important encryption algorithms, and their modern applications. The course is beginner-friendly and practical.

The goal is that after the course you will know what cryptography is, what it is used for, and how to choose the right encryption techniques and settings for different purposes.

What is cryptography? Basic concepts and uses

Introduction to Cryptography

Caesar Cipher: The Ancient Code That Changed Communication

The Enigma Machine: How WWII Codebreakers Unlocked the Greatest Mystery of the War

Historical encryption techniques

Checksums

What are hash functions and what are they used for?

Cracking Hashes: How Does It Work?

MD5 hash - a broken classic

PBKDF2, BCrypt, SCrypt and Argon2

SHA2 vs SHA3 vs PBKDF2 vs bcrypt vs SCrypt vs Argon2: Which to choose for password storage?

Diversion functions

What is MAC and why is it needed?

Different MAC algorithms

MAC algorithms

Random numbers in cryptography

Random numbers

What is symmetric cryptography?

Block Ciphers

DES, 3DES and AES

Stream Ciphers

Initialization vector (IV) and its vulnerabilities in cryptography

Symmetric cryptography

What is asymmetric cryptography?

Digital signatures

Key exchange algorithms

Asymmetric cryptography

Encoding methods

Encoding Methods (Encoding Methods)

 TLS (Transport Layer Security): The foundation of Internet security

Certificates: Building blocks of digital trust

Public Key Infrastructure (PKI): The Foundation of Digital Trust

TLS Building Blocks: Cipher Suites

SSL/TLS threats

SSL/TLS and PKI

What is key management and why is it important?

Key management in cloud services: AWS, GCP and Azure

On-Premise Key Management with HashiCorp Vault

CertBot and automatic renewal of certificates

HSM modules

TPM modules

Key management

Auditing SSL/TLS settings with Qualys' SSL Labs scanner

Auditing SSH settings with Nmap

CyberChef - A browser-based cryptographic Swiss army knife

Useful Crypto Tools

Crypto - Final Exercise

Cryptography

Cryptography - Learned Practice

Learn to hack — start here