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Exam Information
Official specifications published by EC-Council
Exam Format
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Skills this practice test covers
- Encrypt and break classical ciphers such as Caesar, Atbash and Vigenère, and test them in CrypTool.
- Compare block ciphers such as DES, AES and Blowfish, and choose a cipher mode such as CBC or CTR.
- Explain how hash functions, salts and HMAC protect the integrity of data.
- Work through the number theory behind RSA, Diffie-Hellman and elliptic curve cryptography.
- Apply PKI, Kerberos, TLS, VPNs and disk encryption to real systems.
- Recognize cryptanalysis methods such as frequency analysis and differential cryptanalysis, and name post-quantum options.
Explore related topics
212-81V3 exam content
6 domains · 55 topics · 245 of 398 questions are written for 212-81V3
Introduction and History of Cryptography32 questions
This domain starts with what cryptography is and how it developed. Candidates work with classical ciphers, from single-alphabet substitution such as Caesar and Atbash to multi-alphabet ciphers such as Vigenère and Playfair, and try them in CrypTool.
Skills tested
- Encrypt a message with Caesar, Atbash and affine ciphers, and explain their weaknesses.
- Use multi-alphabet ciphers such as Vigenère, Playfair and ADFGVX.
- Describe other classical methods, such as null ciphers, book ciphers, rail fence and the Enigma machine.
- Run classical ciphers in CrypTool and compare the results.
Questions by topic
- Classical Ciphers5
- Information Theory and Cryptographic Concepts1
- Mono-Alphabet Substitution5
- Multi-Alphabet Substitution9
- History of Cryptography2
- Other Classical Methods5
- What is Cryptography2
- Kerckhoffs's Principle1
- Using CrypTool2
Symmetric Cryptography & Hashes72 questions
This domain covers the algorithms behind most everyday encryption. Candidates explain information theory and binary operations such as XOR, compare block and stream ciphers, describe DES, AES and their modes, and use hash functions and HMAC.
Skills tested
- Explain how a Feistel network and S-boxes build a block cipher.
- Compare DES, 3DES, DESX and AES, including their key sizes and rounds.
- Choose a cipher mode such as ECB, CBC, CFB, OFB or CTR, and explain the initialization vector.
- Compare hash algorithms such as MD5, the SHA family and RIPEMD-160, and explain salting.
- Describe how a MAC and an HMAC show that a message has not changed.
Questions by topic
- Cipher Modes of Operation12
- Feistel Network5
- Hash Algorithms8
- DES and Variants6
- MAC and HMAC4
- Hash Function Basics7
- Advanced Encryption Standard (AES)7
- Stream Ciphers2
- Information Theory and Cryptographic Concepts4
- Other Block Ciphers5
- Block vs Stream Ciphers3
- Block Cipher Modes3
- Stream Cipher Algorithms2
- Windows Hashing2
- Kerckhoffs's Principle2
Number Theory and Asymmetric Cryptography60 questions
This domain is the mathematics behind public key cryptography. Candidates use prime numbers, Euler's totient, modular arithmetic and discrete logarithms, explain the birthday problem and random number generators, and describe Diffie-Hellman, RSA, DSA and elliptic curve cryptography.
Skills tested
- Work with prime numbers, co-prime numbers, Euler's totient and the modulus operator.
- Explain the birthday paradox, and why it limits the strength of a hash.
- Compare random number generators such as the linear congruential generator, Mersenne Twister and Fortuna.
- Describe key exchange with Diffie-Hellman, and encryption and signatures with RSA and DSA.
- Explain why elliptic curve cryptography reaches the same strength with shorter keys.
Questions by topic
- Forward Secrecy6
- Elliptic Curve Cryptography8
- Diffie-Hellman6
- RSA5
- Birthday Problem5
- Asymmetric Algorithms3
- Mathematical Concepts4
- Digital Signatures5
- Random Number Generation7
- Other Asymmetric Algorithms5
- Basic Number Facts2
- Logarithms2
- Algebraic Structures2
Applications of Cryptography53 questions
This domain puts the algorithms to work. Candidates explain digital certificates and PKI, authentication protocols such as CHAP and Kerberos, Wi-Fi encryption, SSL/TLS and VPNs, file and disk encryption, steganography and blockchain.
Skills tested
- Read an X.509 certificate, and explain the roles of a CA and an RA in a PKI.
- Compare authentication protocols such as PAP, CHAP, EAP and Kerberos.
- Compare WEP, WPA, WPA2 and WPA3, and explain the TLS handshake.
- Set up file encryption with EFS and disk encryption with BitLocker or VeraCrypt.
- Detect hidden data with steganalysis methods such as chi-square analysis.
Questions by topic
- PKI Infrastructure13
- VPN Technologies4
- PGP Certificates3
- SSL/TLS5
- Steganalysis3
- Wi-Fi Encryption4
- Kerberos6
- Disk Encryption6
- Digital Certificates5
- Steganography3
- Asymmetric Algorithms1
Cryptanalysis19 questions
This domain looks at breaking ciphers. Candidates use frequency analysis and the Kasiski method on classical ciphers, describe modern attacks such as linear and differential cryptanalysis, and explain password cracking with rainbow tables.
Skills tested
- Break a substitution cipher with frequency analysis.
- Compare chosen-plaintext, ciphertext-only and related-key attacks.
- Explain how rainbow tables speed up password cracking, and how salting defeats them.
Questions by topic
- Password Cracking4
- Modern Cryptanalysis10
- Classical Cryptanalysis4
- Using CrypTool1
Quantum Computing and Cryptography9 questions
This domain looks ahead. Candidates explain qubits and quantum key distribution, why quantum computers threaten current public key algorithms, and post-quantum approaches such as lattice-based cryptography.
Skills tested
- Explain qubits and quantum key distribution in plain terms.
- Name post-quantum families such as lattice-based crypto, learning with errors and NTRU.
Questions by topic
- Post-Quantum Cryptography4
- Quantum Computing Impact3
- Quantum Fundamentals2
Requirements
- No formal prerequisites: anyone can book the exam.
- Recommended: one to two years in an IT or security job.
- Recommended: basic information security concepts, networking fundamentals and basic mathematics.
About the 212-81V3 exam
212-81V3 tests whether security and network professionals understand how encryption works and where to use it. It is the third version of the Certified Encryption Specialist (ECES) exam from EC-Council. Its six domains move from the history of cryptography through symmetric ciphers, hashes, number theory and asymmetric algorithms to applications, cryptanalysis and quantum computing. EC-Council suggests one to two years in IT or security, basic networking and basic mathematics before the exam.
Symmetric Cryptography & Hashes and Number Theory and Asymmetric Cryptography have the most questions in the PlanetCert practice test. The explanations work through the steps of an algorithm, such as how a Feistel round mixes the two halves of a block, or how a birthday attack finds a hash collision. Flashcard mode suits the long list of named algorithms, from Blowfish and Twofish to Blum Blum Shub. Brainy AI Assistant can check a small RSA calculation step by step, or explain what forward secrecy protects.
How to earn the certification
- Earns
- EC-Council Certified Encryption Specialist (ECES)Specialist
The certification is valid for three years.
- After
- 312-50v13 Certified Ethical Hacker (CEH v13)
EC-Council's ethical hacking exam, which applies cryptography among many attack and defense topics.
- 312-49v11 Computer Hacking Forensic Investigator (CHFI v11)
EC-Council's computer forensics exam. Hashes and encrypted drives are everyday material in forensic work.
- 312-38 Certified Network Defender (CND)
EC-Council's network defense exam, which builds on the VPN, TLS and certificate topics here.
- 312-50v13 Certified Ethical Hacker (CEH v13)
How to prepare for 212-81V3
- 1
Crack a Vigenère message by hand
Encrypt a short text with a Vigenère key, then find the key length with the Kasiski method and recover the text with frequency analysis. CrypTool can check the result.
- 2
Draw DES and AES rounds
Symmetric Cryptography & Hashes has the most questions in the practice test. Draw one Feistel round for DES and the steps of one AES round, and note the key sizes and the cipher mode that suits each use.
- 3
Run a Diffie-Hellman exchange on paper
Choose a small prime and a generator, pick two private values, and compute the shared secret from both sides. Then explain why an observer who sees only the public values cannot easily find it.
- 4
Inspect a real certificate chain
Open a website certificate in a browser, and read its X.509 fields, its CA and its chain of trust. Then turn on BitLocker or EFS on a test machine and back up the recovery key.
- 5
Close with Timed Mode runs
Take the 212-81V3 practice test in Timed Mode. Send each missed algorithm question to Brainy AI Assistant for a step-by-step walkthrough, then repeat that domain in Study Mode.
Start a timed 212-81V3run
EC-Council's official preparation is the ECES v3 training program with its ECES v3 courseware.
Who 212-81V3 is for
- Security professionals who choose and configure encryption for their organization.
- Network administrators who run VPNs, Wi-Fi security and certificates.
- Penetration testers and ethical hackers who judge how strong a system's cryptography is.
- Compliance analysts who assess whether stored and transmitted data is properly encrypted.
Typical job titles: Security engineer · Cryptography engineer · Network security engineer · Security consultant · Penetration tester
212-81V3 glossary
18 terms from the exam objectives and the vendor's official material, each defined in a sentence.
- Birthday Paradox
- The result that matching pairs appear in a group far sooner than expected, which is why hash collisions are easier to find than they seem.
- Blum Blum Shub
- A pseudo-random number generator that repeatedly squares a number modulo the product of two large primes.
- Differential Cryptanalysis
- An attack that studies how differences between pairs of plaintexts change the ciphertexts, to recover key bits.
- Diffie-Hellman
- A key exchange method that lets two parties agree on a shared secret key over a public channel.
- ECB
- Electronic Codebook mode: each block is encrypted on its own, so identical plaintext blocks give identical ciphertext blocks.
- Euler's Totient
- The count of positive whole numbers up to n that share no factor with n. RSA uses it to find the private key.
- Feistel Network
- A block cipher structure that splits each block into two halves and, in each round, mixes one half into the other, as DES does.
- Forward Secrecy
- A property where each session uses its own temporary key, so a stolen long-term key cannot decrypt past sessions.
- Frequency Analysis
- Breaking a substitution cipher by comparing how often each ciphertext letter appears with normal letter frequencies in the language.
- Galois Field
- A finite field with a prime-power number of elements. AES does its byte arithmetic in one.
- HMAC
- A hash-based message authentication code: a hash computed with a secret key, which proves a message's integrity and origin.
- Initialization Vector (IV)
- A random or unique starting value used with the key, so the same plaintext encrypts differently each time.
- Kasiski method
- A way to find the key length of a Vigenère-style cipher from the distances between repeated groups of ciphertext letters.
- Kerberos
- An authentication protocol in which a trusted server issues tickets, so users prove who they are without sending passwords over the network.
- Kerckhoffs's Principle
- The rule that a cipher must stay secure even when everything about it except the key is public.
- Lattice-Based Crypto
- Public key methods built on hard problems in mathematical lattices, one of the main post-quantum families.
- Null Ciphers
- A classical method that hides the real message among many meaningless characters, such as the first letter of each word.
- Steganalysis
- Finding hidden messages inside files such as images or audio.