Messaging

Signal

Signal has the strongest cryptography in mainstream messaging and the most invasive registration model — a real phone number.

Website

signal.org

KYC

optional KYC — Phone number historically required for registration; usernames are now supported for in-app discovery, but a phone or registration-token is still part of signup.

Status

active

Fiat on-ramp

no

Payment

donation

Jurisdiction

United States (Signal Foundation, non-profit)

Founded

2014

Open source

yes

Custodial

no

Last verified

Jan 1, 2026

Sources

2

Overview

Strengths

• Reference end-to-end encryption protocol (Signal Protocol) — used by WhatsApp, Wire, others.
• Sealed Sender, private contact discovery, and other metadata-minimization measures shipped over years.
• 2024-era username support reduces phone-number exposure in-app, though signup still uses a number.

Caveats

• Phone number registration is the dominant privacy caveat — it binds the account to a number, even if it isn't displayed to contacts.
• U.S. non-profit operator; servers in U.S.
• SMS-fallback removal (2022) removed a privacy footgun but also a feature.
• Facts need re-verification by operator (last seeded 2026-01).

Verdict

Signal has the strongest cryptography in mainstream messaging and the most invasive registration model — a real phone number. The username feature reduces in-app exposure of the number; it does not remove the number from registration. For threat models that exclude any phone-number-derived identifier, see SimpleX or Session.

FAQ

Does Signal require KYC?

Signal has optional KYC; you can use the service without it for the basic flow. Phone number historically required for registration; usernames are now supported for in-app discovery, but a phone or registration-token is still part of signup.

What payment methods does Signal accept?

Signal accepts: donation.

Where is Signal based?

Operating jurisdiction listed as United States (Signal Foundation, non-profit). This is best-known information; corporate structure can be opaque.

Sources

1. Signal blog · accessed Jan 1, 2026
2. Signal support · accessed Jan 1, 2026

Mentioned in

Alternatives to Signal

• Briar none kyc · Germany
• conversations.im optional kyc · Germany
• Cwtch none kyc · independent
• Delta Chat none kyc · independent
• Element (Matrix) optional kyc · United
• JMP.chat none kyc · Canada

Entry last verified Jan 1, 2026. Notice an error? Send it via the contact form.