What is the difference between an authenticator OTP code and a secret link?

An authenticator OTP (One-Time Password) is a time-based 6-digit verification code generated by an app (like Google Authenticator or Microsoft Authenticator) with a 30-second lifespan. Paste & Purge is not an OTP generator; it is a secure transmission tool used to securely send sensitive text (such as 2FA backup recovery codes, account unlock PINs, or temporary initial passwords) to another person without leaving the text in messaging logs.

Why is it dangerous to store 2FA backup recovery codes in email drafts or notes?

Emergency 2FA backup codes are static recovery keys that grant instant access to an account if the primary authenticator device is lost. If backup codes sit in an email inbox, cloud notepad, or chat message history, any compromise of that account will immediately expose all backup recovery codes.

How should IT helpdesks deliver temporary account reset passwords to remote workers?

IT support should generate temporary credentials and deliver them via a short-expiration (e.g., 15-minute), single-view encrypted link. Once the remote employee accesses the secret and logs into their workstation, they should be required to immediately set a permanent password upon first login.

What is dual-channel transmission and why is it recommended for login codes?

Dual-channel transmission involves separating the delivery channels for increased security. For example, sending the one-time secret link via email or Slack, while providing the optional decryption passphrase over a phone call, SMS, or in-person conversation. An adversary must compromise both separate communication channels to access the secret.

What expiration window should I choose when transmitting temporary login codes?

For real-time account handoffs (such as an onboarding session or live technical support call), choose a 5-minute or 15-minute expiration with a 1-view limit. If the recipient is in a different time zone, select 1 hour or 24 hours.

Can Paste & Purge read the recovery codes or login pins I share?

No. All data is encrypted locally in your web browser with AES-256-GCM using Web Crypto APIs before transmission. The decryption key is contained strictly in the URL hash fragment (#), which web browsers never transmit to the server.

Access Delegation Guide

How to Share Temporary Login Codes, PINs, and Recovery Keys Securely

Published by Paste & Purge · Security Best Practices · 8 min read

In both corporate IT environments and personal tech management, situations arise where temporary access codes must be communicated to another person. Examples include an IT helpdesk issuing a temporary workstation login PIN, a system administrator delegating an emergency server access token, or sharing two-factor authentication (2FA) recovery backup keys during account migration.

Because these credentials are intended for immediate, one-time use, transmitting them through permanent communication channels (like email, text messages, or Slack) creates unnecessary residual security risk.

Temporary Codes vs. Application OTP Authenticator Codes

Time-based one-time passwords (TOTP) generated by authenticator apps refresh automatically every 30 seconds. However, static recovery codes, temporary account setup passwords, and system access PINs remain valid until used or manually revoked.

Types of Temporary Access Codes & Associated Risks

2FA Backup & Account Recovery Codes

Static 8-digit or 16-character keys generated during 2FA setup. If primary authenticator hardware is destroyed, these codes grant instant master access. They should never be stored in plain text in email drafts.

Initial Onboarding Passwords & Setup PINs

Temporary passwords provisioned by IT teams for new employees. If sent in welcome emails, they remain searchable in company email logs indefinitely.

One-Time System Verification Tokens

Delegated tokens or authorization codes shared with external developers or audit consultants during live maintenance windows.

Smart Lock & Wi-Fi Guest Access PINs

Temporary keypad entry codes for house guests, Airbnb renters, or maintenance personnel that need to be delivered securely.

Best Practices for Transmitting Sensitive Codes

1. Enforce Short Expiration

Configure the secret link with a tight expiration window (5 or 15 minutes) when coordinating in real time, preventing lingering links.

2. Single-View Burning

Ensure the link is view-limited to 1 access. Once the recipient retrieves the code, the server record is permanently deleted.

3. Split Channels (Out-of-Band)

If using a passphrase, send the secret link in email and convey the passphrase via phone or SMS for dual-channel protection.

4. Immediate First-Login Reset

Require the recipient to replace any temporary password or PIN with a permanent, unique credential immediately upon signing in.

Common Mistakes to Avoid

✕Never send the username and temporary password together in a single unencrypted email or text message.
✕Do not save static 2FA recovery backup codes in cloud notes (Evernote, Apple Notes) without encryption.
✕Avoid reading recovery codes over public speakerphone or unencrypted voice channels in open offices.
✕Do not post temporary system access credentials into group chat channels or shared ticket threads.

How to Share a Temporary Login Code Using Paste & Purge

1. Paste the temporary code

Enter the setup password, PIN, or recovery codes into the Paste & Purge text area.

2. Select 5 or 15-minute expiration with 1 view

Restrict the lifetime so the link cannot be opened after the immediate handoff is finished.

3. Share the self-destructing link

Copy the generated URL. The recipient opens the link, copies the code, and the encrypted record is purged permanently from the server.

Read more about what one-time secret links are or explore secret links vs. password managers.

Frequently Asked Questions

Answers to common questions on temporary access delegation and code safety.

Share a Temporary Login Code Safely

Encrypt your temporary PIN, recovery keys, or reset code in your browser and send an expiring one-time link. Never leave recovery codes in chat histories.