What is CSRF in simple terms?
PICTURE THIS: A SENTENCE BECOMES TOKENS
The model does not read letters like humans. It reads these pieces, then predicts the next one.
Simple meaning
Cross-site request forgery tricks the browser into sending the user's cookies to your API from another site.
WHY — Security instead of guessing?
Why interviewers care about Security:
who only read docs from people who shipped.
and tied to Frontend work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens with tokens?
Before the model can read a sentence, it goes through these steps:
- 1Cross-site request forgery tricks
the browser into sending the user's cookies to your API from another site.
- 2Cookie-based sessions are the
usual target.
- 3SameSite cookies and anti-CSRF
tokens are the mitigations I mention.
- 4Context mix
Attention looks at nearby tokens together.
- 5Next token
The model scores what should come next.
- 6Decode
IDs turn back into readable text.
EXAMPLE — See it in action
Let's see how a real sentence is tokenized (tokens may vary by model):
Note: Actual tokens and IDs depend on the tokenizer (e.g., GPT, Llama, etc.).
Key takeaway
Cross-site request forgery tricks the browser into sending the user's cookies to your API from another site. Cookie-based sessions are the usual target.