security: deviceId stored unencrypted in localStorage

[nanaf6203-bit]

Summary

src/utils/security/transactionSecurity.ts stores deviceId in localStorage unencrypted.

Affected area

src/utils/security/transactionSecurity.ts line ~88

Steps to reproduce / impact

Device fingerprint is reusable to impersonate the user across browsers on the same machine and supports correlation of identity-bound security policies.

Expected behaviour

Store only a salted hash, refresh per session, never reuse across origins. Or remove entirely if not used in security decisions.

Acceptance criteria

• Document the threat model.
• Migrate from storage to per-request payload.
• Audit other localStorage entries for similarly sensitive data.

[Fury03]

@Fury03 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi Maintainer, I can work on this

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[danieloche635-bit]

@danieloche635-bit has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

i would like to work on this issue sir

ℹ️ Repo Maintainers: To accept this application, review their application or assign @danieloche635-bit to this issue.

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[drips-wave]

This issue has been completed by @danieloche635-bit as part of the Stellar Wave Program's 6th Wave 🥳

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