Is your AI chat platform safe? It depends on three things: how your API keys are stored, how your conversations are handled, and what the platform does with your data. AES-256 encryption at rest is the gold standard for key storage. This guide explains what matters and what doesn't.

When you paste an API key into an AI chat platform, where does it go? Who can read it? What happens to your conversations?

These questions matter more than most people realize. Your API key is the equivalent of a password to your AI provider account — anyone with it can use your account and rack up charges. Your conversations often contain proprietary code, business strategy, or personal information.

Most people sign up without checking any of this. This guide covers what security actually looks like in AI chat platforms.

The Three Layers of AI Chat Security

Layer 1: API Key Storage (The Most Critical)

This is where platforms differ the most.

Bad practice: API keys stored in plaintext in a database. If there's a breach, every key is compromised.

Common practice: API keys encrypted at rest but decrypted for every request. Better, but the key exists in memory during processing.

Best practice: API keys encrypted with AES-256 at rest, decrypted only in-memory when needed to call the provider, and never logged or persisted in plaintext anywhere in the pipeline.

Storage Method	Risk Level	Example Platforms
Plaintext in DB	Critical	Some self-hosted tools
AES-256 encrypted at rest	Low	Mykey, most serious platforms
Client-side only (never sent to server)	None	Local-only tools

Mykey encrypts API keys with AES-256 at rest. Keys are only decrypted server-side when constructing the request to your chosen AI provider. They're never written to logs, never cached in plaintext, and never exposed in API responses. (Here's how the rest of Mykey works.)

Layer 2: Conversation Data

Your conversations contain proprietary code, business strategies, personal information. How they're stored matters.

Practice	What It Means
Encrypted at rest	Conversations stored in encrypted format in database
Encrypted in transit	TLS 1.3 for all API/data transfer
Used for training	Platform reads your conversations to improve their models
Deleted on request	You can wipe your history at any time
Retention policy	How long data is kept after you delete your account

Before signing up for any AI platform, check two things: (1) their data retention policy, and (2) whether they train on your conversations. Some major platforms still train on user chat data by default.

Layer 3: Provider Privacy Policies

The AI provider you use — OpenAI, Anthropic, xAI, Google — has its own data policy that applies regardless of which chat platform you choose.

OpenAI API: Does NOT train on API traffic by default (since March 2023). Data retained for 30 days for abuse monitoring, then deleted. (OpenAI API data usage policy)
Anthropic API: Does NOT train on API traffic. Data retained for a limited period for safety monitoring. (Anthropic data policy)
xAI API: Similar policy — does not train on API data by default. (xAI privacy policy)
Google AI API: Does not train on API traffic. Data retained briefly. (Google Cloud AI data governance)

Important caveat: These protections apply to API usage. If you use the web interfaces (chat.openai.com, claude.ai, grok.com), those conversations can be used for training unless you explicitly opt out in settings.

The BYOK model has a privacy advantage: when you use an API key through a platform like Mykey, your traffic goes through the provider's API — which has stronger privacy protections than their web UI.

What to Look For in a Platform's Security

Checklist for evaluating any AI chat platform:

Encryption: Are API keys encrypted at rest? (AES-256 is the standard)
Encryption in transit: TLS 1.2 or higher?
Data usage: Are conversations used for training?
Deletion: Can you delete your conversation history?
Audit trail: Is there a record of what the platform does with your keys?
Third-party access: Does the platform have access to your provider accounts?
Open source: Is the security implementation auditable?

For a full model comparison, see GPT-5 vs Claude vs Grok →

How Mykey Handles Security

Mykey handles security transparently. Here's the flow:

You enter your API key — it's immediately encrypted with AES-256 before being stored.
When you send a message — the key is decrypted in-memory, used to call the provider, then discarded.
Your conversations — stored encrypted at rest, accessible only to you, deletable at any time.
Provider relationships — Mykey never sees your provider credentials (OpenAI/Anthropic/xAI don't share them).
No training — Mykey does not train AI models on your conversations. Full stop.

No AI chat platform is 100% risk-free — any service that touches your data has attack surface. But the gap between responsible security and we'll-figure-it-out-later is massive, and most users never check which side their platform is on.

FAQ

Does Mykey train AI models on my conversations?

No. Mykey does not train AI models on your conversations. Your data is yours.

Are my API keys safe with Mykey?

Yes. Your keys are encrypted with AES-256 at rest and only decrypted in memory when calling the provider. They are never logged or stored in plaintext.

Which AI providers don't train on API data?

OpenAI, Anthropic, xAI, and Google all have policies stating they do not train on API traffic. However, conversations through web interfaces (chat.openai.com, claude.ai) may be used for training unless you opt out.

Can I delete my conversation history?

Yes. Mykey lets you delete your conversation history at any time.

Is the BYOK model more private than a subscription platform?

Yes. With BYOK, your traffic goes through the provider's API, which has stronger privacy protections than consumer web interfaces. You also control your own API keys.

Want to see the difference? Start your 7-day free trial. AES-256 encryption, no training on your data, and you pay providers directly. See how Mykey compares to subscription AI pricing →

Is Your AI Chat Safe? What AES-256 Encryption Actually Means