In short: FLN Tutors gives cryptography assignment help and tutoring for computer science, mathematics and cyber security students. Tutors explain classical ciphers, symmetric encryption such as AES and modes of operation, modular arithmetic and number theory, RSA, Diffie–Hellman and elliptic curves, hash functions, MACs, digital signatures, key sizes and protocols such as TLS step by step, with worked numerical examples. Matched to a verified specialist who knows your course, your university's marking criteria, and your deadline.
Topics we cover
FLN offers one-to-one online Cryptography tutoring with verified subject specialists. Sessions focus on calculations, design problems and the theory behind them, including Symmetric Encryption, Asymmetric Encryption, AES and DES, using your own course material, so you understand the subject and can apply it yourself.
Last updated
Cryptography help is one-to-one support from a security or maths tutor who explains how encryption, hashing and signatures work, and helps with number theory problems, proofs and coding tasks. For wider security topics, see cyber security help.
| What you need | Best option | What you get |
|---|---|---|
| Regular lessons on cryptography | Live one-to-one tutoring | Algorithms and maths explained |
| Problems you are stuck on | Homework help | Step-by-step worked solutions |
| A graded assignment or implementation | Assignment help | Guidance within your course's rules |
This map lists the core cryptography topics, the point where students most often get stuck, and how a tutor helps you past it.
| Topic | Where students get stuck | How a tutor helps |
|---|---|---|
| Classical ciphers | Caesar, Vigenère and frequency analysis | Worked encryption and attacks |
| Symmetric encryption | AES and modes of operation | Mode comparison tables |
| Number theory | Modular arithmetic and inverses | Worked extended Euclid examples |
| RSA | Key generation, encryption and decryption | Worked RSA by hand |
| Key exchange | Diffie–Hellman | Worked key exchange |
| Hashing | Properties of hash functions | Property explanations |
| Signatures and MACs | Authenticity and integrity | Flow diagrams |
| Key sizes | Brute-force effort and security levels | Worked key space calculations |
Tutors cover undergraduate and postgraduate cryptography.
| Area | Topics |
|---|---|
| Foundations | Security goals, Kerckhoffs's principle, attack models |
| Classical | Substitution, transposition, Vigenère, one-time pad |
| Symmetric | Block and stream ciphers, AES, DES history, modes such as CBC and GCM |
| Mathematics | Modular arithmetic, primes, Euler's theorem, discrete logarithms |
| Public key | RSA, Diffie–Hellman, ElGamal, elliptic curve cryptography |
| Integrity | Hash functions, MACs, HMAC, digital signatures |
| Protocols | TLS, certificates, PKI, post-quantum cryptography basics |
A toy example with small primes (real keys use primes hundreds of digits long).
| Step | Working | Result |
|---|---|---|
| Choose primes | p = 5, q = 11 | n = 55 |
| Euler's totient | φ = (5 − 1)(11 − 1) | 40 |
| Public exponent | e = 3, since gcd(3, 40) = 1 | e = 3 |
| Private exponent | d with 3d ≡ 1 (mod 40) | d = 27 (3 × 27 = 81 = 2 × 40 + 1) |
| Encrypt m = 7 | 7³ = 343 ≡ 13 (mod 55) | c = 13 |
| Decrypt | 13²⁷ mod 55 | 7 |
Key exchange and brute-force effort.
| Question | Working | Answer |
|---|---|---|
| Diffie–Hellman with p = 23, g = 5; Alice's secret a = 6. Alice sends | 5⁶ mod 23 | 8 |
| Bob's secret b = 15. Bob sends | 5¹⁵ mod 23 | 19 |
| Shared secret computed by Alice | 19⁶ mod 23 | 2 (Bob gets 8¹⁵ mod 23 = 2 too) |
| Time to try every 128-bit key at 10¹² keys per second | 2¹²⁸ ÷ 10¹² ≈ 3.4 × 10²⁶ seconds | ≈ 10¹⁹ years |
This is why attacks target weak implementations and keys rather than brute force against modern ciphers.
Tutors match your level, syllabus and exam board, from school to PhD.
| Level | What you study | Matching help |
|---|---|---|
| A-Level and first-year | Modular arithmetic and simple ciphers | Discrete Structures and live tutoring |
| Undergraduate computer science | Cryptography and network security modules | Computer Networks, homework help |
| Mathematics degrees | Number theory and cryptography | Theory of Computation and assignment help |
| Master's and research | Applied and theoretical cryptography | Dissertation help |
Related: Cyber Security, Information Security, Blockchain and Number Theory and Fourier Analysis.
Most lost marks come from arithmetic slips and confusing security properties.
| Mark-loser | What to do instead |
|---|---|
| Errors in modular exponentiation | Use repeated squaring and reduce at each step |
| Wrong modular inverse | Use the extended Euclidean algorithm and check the result |
| Confusing encryption and hashing | Encryption is reversible with a key; hashing is one-way |
| Using ECB mode | Explain why modes such as GCM are preferred |
| Rolling your own crypto in projects | Use vetted libraries |
| Vague security claims | State the attack model and assumptions |
Cryptography is assessed in several formats, and each one is marked on different things. Tutors help you understand the brief and the marking criteria before you start.
| Assessment | What markers look for |
|---|---|
| Problem sets | Accurate number theory and algorithm calculations |
| Proofs | Correct, rigorous security or correctness proofs |
| Programming tasks | Correct use of cryptographic libraries |
| Exams | Algorithms, properties and short calculations |
| Reports | Evaluation of protocols or attacks |
Cryptography students use these tools.
| Tool | What it is used for |
|---|---|
| Python with the cryptography library | Implementing and testing |
| SageMath | Number theory computations |
| OpenSSL | Keys, certificates and TLS experiments |
| CrypTool | Visualising classical and modern ciphers |
| Online modular calculators | Checking arithmetic |
Cryptography is taught to similar core ideas worldwide, but grading, referencing and course structure differ. FLN tutors work from your own syllabus and handbook and schedule lessons in your time zone. Always follow your module handbook for referencing.
| Country | Where cryptography is studied | Grading | Referencing usually used |
|---|---|---|---|
| United Kingdom | Computer science, maths and cyber security degrees | GCSE 9–1, A-level A*–E; degrees First, 2:1, 2:2, Third | IEEE or Harvard |
| United States | Cryptography and security courses | Letter grades A–F and a 4.0 GPA scale | IEEE or ACM |
| Australia | Computer science and cyber security degrees | HD, D, C, P at university; ATAR for school leavers | IEEE or Harvard |
| Canada | Computer science and mathematics programmes | Letter grades or percentages; GPA scales vary by province and university | IEEE or ACM |
| India | B.Tech/BE CSE cryptography and network security papers, M.Tech and MCA | Board exam percentages; university CGPA, often on a 10-point scale | IEEE |
Students in Ireland, the Gulf, Europe, Africa and Asia can book the same help, with lessons in their own time zone.
The price of cryptography help depends on the type of task and your deadline. A short calculation costs less than a full implementation project. You always see the price first: a fixed quote for homework and assignment guidance, or the tutor's hourly rate for live lessons, with no contract and no minimum number of sessions. Refunds follow our refund policy.
Stuck on a Cryptography question?
Send it to a Cryptography tutor for step-by-step working. The quote is free.
What you get
Simple process
Tell us your assignment brief, word count, deadline, and academic level. The more detail, the better the match.
We pair you with a Cryptography expert whose background aligns with your specific topic and university requirements.
Your work arrives before the deadline, plagiarism-checked. Free revisions until it meets your exact requirements.
Takes about two minutes. The quote is free.
Cryptography and related specialists
Every expert is degree-verified and quality-tested before joining.
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Student reviews
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Yes. Tutors explain algorithms and maths and help with problems and code, within your course's rules.
The science of securing information through techniques such as encryption, hashing and signatures.
Public-key methods exchange or protect a key, then a fast symmetric cipher such as AES encrypts the bulk data, as in TLS.
It uses a public key (n, e) and private key d, with security based on the difficulty of factoring n.
φ(n) counts integers up to n that are coprime to n; for n = pq, φ(n) = (p − 1)(q − 1).
Use the extended Euclidean algorithm to solve ax ≡ 1 (mod m).
A method for two parties to agree a shared secret over an insecure channel.
The Advanced Encryption Standard, a widely used symmetric block cipher with 128-bit blocks.
Identical plaintext blocks give identical ciphertext blocks, revealing patterns.
A function that maps data to a fixed-size digest and is hard to reverse or find collisions for.
The signer applies the private key to a hash of the message; anyone can check it by applying the public key and comparing hashes.
A MAC uses a shared key; a signature uses a private key and can be verified by anyone with the public key.
Cryptography designed to resist attacks by quantum computers.
Yes. Tutors cover modular arithmetic, primes and discrete logarithms.
The maths takes practice; working small examples by hand helps.
Tutors work from your course text, such as Stallings or Katz and Lindell.
Often, yes, for short problems, depending on tutor availability.
Yes. Tutors explain certificates, handshakes and trust chains.
Yes. Tutoring, worked examples and feedback are a normal part of learning. You should use the explanations to understand the method and submit your own work in line with your school's or university's academic integrity rules. See our academic integrity policy.
Yes. Your files and details are used only to help you and are not shared with your school or university. See our privacy policy.
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