RAINBOW TABLE THREAT AND DEFENSE MECHANISMS

Abstract

Rainbow tables are pre-computed correspondence tables used in cybersecurity to recover passwords and sensitive information. This article explains in detail the concept of rainbow tables, how they work, what capabilities attackers have, and effective defenses against these attacks — in particular, the use of "salts" and strong, slow hash functions. The article explains the dangers of storing passwords in plain text through an example: if a system stores passwords without hashing or with a weak hash algorithm, an attacker can easily take over the database and break into accounts. Rainbow tables, on the other hand, provide much faster results by pre-computing a large number of passwords and their hashes, and then searching the table for the target hash; this significantly reduces the computation time compared to brute-force methods. The article also describes two types of salting — static and dynamic — and discusses their advantages and limitations, as well as what can happen if the salt is compromised. It also provides practical recommendations on using modern KDF (key derivation function) such as Argon2, bcrypt and scrypt, using pepper, strengthening password policies, encrypting files and adding additional layers of protection such as multi-factor authentication (MFA). The article also clearly shows the consequences of an attack - password cracking, data disclosure and credential stuffing, which increases the responsibility for protecting information systems.