Are you studying for the CEH, CISSP or Security+ certifications?

Skillset can help you prepare! Sign up for your free Skillset account and take the first steps towards your certification.

Upgrade Account

E, T, O, A, etc., are the most common letters in the English language. You notice that these letters are also the most common in the cipher text you have. This is most likely a __________ cipher.

Substitution

Block

Symmetric

Transposition

Explanation

Skillset helps you pass your certification exam.

Contributions and Interactions
Practice Questions

Study thousands of practice questions that organized by skills and ranked by difficulty.

Contributions and Interactions
Personalized Training

Create a tailored training plan based on the knowledge you already possess.

Training Video Selector
Exam Readiness

Know when you’re ready for the high-stakes exam. Have the confidence that you will pass on your first attempt.

Get A Free Skillset Account