EC-Council Certified Encryption Specialist case studies
EC-Council Certified Encryption Specialist · Put your knowledge to work in context.
The EC-Council Certified Encryption Specialist (E CES) is a cryptography credential for cybersecurity professionals, penetration testers, forensics specialists, cloud security architects, developers, and IT staff who select or deploy VPNs and digital certificates. The exam, code 212-81, is delivered in multiple-choice format through the EC-Council Exam Portal: 50 questions, 2 hours, 70% required to pass. EC-Council states that no prior cryptography knowledge is assumed and no mathematics beyond basic algebra is required. The program spans six modules: the history of cryptography (Caesar, Vigenère, Playfair, Enigma); symmetric cryptography and hashes (Feistel networks, DES, AES, Blowfish, Twofish, Skipjack, CAST, TEA, modes of operation, MD5, SHA, RIPEMD, HMAC, salt); number theory and asymmetric cryptography (primes, Euler's totient, Diffie-Hellman, RSA, DSA, elliptic curves, Elgamal, random number generators); applications (X.509, PKI, Kerberos, PGP, WEP, WPA2, WPA3, SSL/TLS, IPSec, BitLocker, VeraCrypt, steganography, NSA suites); cryptanalysis (frequency analysis, Kasiski, chosen plaintext, linear and differential cryptanalysis, rainbow tables); and quantum computing and cryptography (QKD, qubits, NIST post-quantum approaches such as lattice-based crypto, NTRU). The EC-Council Certified Encryption Specialist case studies are 5 cases and about 3,374 words.
1Padding Oracle in a Payroll Portal
Northwind Payroll runs a claims portal that stores 12,000 employee records. Each record is encrypted with AES-256-CBC using a fresh 16-byte IV prepended to the ciphertext, and PKCS#7 padding.
722 words, about 4 min2Low-Exponent RSA Licenses on Constrained Hardware
Helios Licensing issues 300,000 signed license files for on-premise software. Each license contains the customer name, seat count, and expiry date; the vendor signs it with RSA-2048 using public exponent e=3 and PKCS#1 v1.5 with SHA-256.
678 words, about 3 min3Leaf Key Compromise and Pinning at a Patient Portal
Meridian Health operates a patient portal for 4,200 clinicians. Its internal CA has an offline RSA-4096 root valid for 20 years and an online issuing CA with RSA-2048 valid for 10 years.
677 words, about 3 min4Repeating-Key XOR Disguised as AES
SecureBox is a file-sharing appliance sold to 40 clinics. Its marketing claims 'AES-256 encryption at rest.' A consultant finds that files are transformed by XOR with a repeating 16-byte key, where the key is the first 16 bytes of the MD5 digest of the user's password, and the result is Base64-encoded.
680 words, about 3 min5Harvest-Now-Decrypt-Later at a Biobank
Aster Biobank stores 4 PB of genomic and clinical data under a 20-year retention contract. Data at rest is AES-256-GCM.
617 words, about 3 min