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The user starts a passwordless login using the registered identity.
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Multi-Channel MFA
Split the login instructions.
Bring them together securely.
Rainbow Secure Multi-Channel Passwordless Login sends a dynamic token and its dynamic formatting instruction to different registered endpoints. The user needs both channels to complete the login.
EMAILToken: D@0s
+
SMSApply Style: Italic
=
LOGINComplete response
EMAIL
Token Text
D@0s
SMS
Formatting instruction
Apply Italic
Both required ✓
Why multi-channel
No single message contains the complete login response.
The token text and formatting instruction are generated dynamically and delivered to different registered endpoints. The authorized user combines what is received across both channels.
One endpoint receives what to enter. A different endpoint receives how to format it.
A coordinated passwordless journey
Two registered endpoints. One complete login.
Split the dynamic challenge
Channel AReceives the token text
Channel BReceives the formatting instruction
Combine and verify
The user enters the token and applies the received formatting instruction.
Apply access policy
Grant, challenge or block access based on the complete verification result.
Interactive split-channel demo
Use both messages to complete the login.
Select a delivery route. Then combine the token from Channel A with the formatting instruction from Channel B.
MULTI-CHANNEL PASSWORDLESS LOGIN
This educational demo does not send messages or collect credentials.
Registered endpoint combinations
Separate the challenge across the channels your users have.
Organizations can configure which registered endpoint receives the dynamic token and which receives the dynamic formatting instruction.
Receive the token text or formatting instruction through the registered email account.
SMS
Receive the token text or formatting instruction through the registered phone number.
Authenticator app
Receive the configured component through the registered authenticator experience.
Example configuration
Token text → registered email
+Formatting instruction → registered phone by SMS
Designed for access that needs separation
Use multiple registered endpoints without adding a traditional password.
Multi-Channel Passwordless Login can support workforce, remote, administrative and sensitive access journeys where the organization wants different parts of the dynamic challenge delivered separately.
Separate instructions across registered work and mobile endpoints.
Require the user to combine messages before entering a remote session.
Apply multi-channel passwordless verification to higher-impact access.
Support login without depending on a traditional password.
PROTECTION IN ACTION
Related threat protection
OTP Theft & SIM Swapping
Multi-Channel MFA can prevent one intercepted endpoint or message from representing the complete authentication response.
- Separate token text and formatting instructions across registered endpoints
- Require the user to combine both parts correctly
- Avoid treating SMS as the only authentication evidence
See Multi-Channel MFA in action
Separate the challenge. Verify the complete response.
Explore how Rainbow Secure can deliver dynamic token text and formatting instructions across your users’ registered endpoints.