Certified Ethical Hacker (CEH) Practice Exam 2026 – Your All-in-One Guide to Exam Success!

Substitution and transposition are fundamental techniques used in cryptography for bit encryption.

In substitution encryption, each bit or group of bits is replaced with another bit or group of bits according to a predefined algorithm. This fundamentally alters the plaintext into ciphertext, ensuring that each instance of the plaintext does not correspond directly to a predictable pattern in the ciphertext.

Transposition encryption, on the other hand, rearranges the bits or characters of the plaintext according to a certain system without altering the actual bits themselves. This technique maintains the original bits but changes their order, complicating the relationship between the plaintext and the ciphertext.

These two methods can be used independently or in combination to enhance security. They create complexity in the encryption process, making it more difficult for unauthorized individuals to decrypt the information without knowledge of the method used the encryption. Understanding these concepts is essential for anyone preparing for extensive cybersecurity roles and certifications like the Certified Ethical Hacker (CEH).