Decryptors were key-like items that could be used to unlock crates, including crates obtained during special event, without having to purchase a key. They are classified as Limited quality.
Items obtained from crates that have been opened with a decryptor, rather than a key, cannot be traded with other players.
When Crates left the game, Decryptors were no longer offered. Decryptors from your inventory were converted into "Bonus Gifts," which can be opened at no cost. Bonus Gifts contain items from the Vindicator Crate series and first Blueprint Series, the "Revival" Series, that will bring back some fan-favorite items throughout Rocket League's history.
Decryptors can currently only be obtained during special events and through the Rocket Pass.
During the Haunted Hallows event, they could be purchased with 'Candy Corn,' a limited-time currency that was earned by completing online matches.
During the Frosty Fest event, decryptors could be purchased with 'Snowflakes,' a limited-time currency that was earned by completing online matches.
During the Spring Fever event, decryptors could be purchased with 'Flowers,' a limited-time currency which was also earned by completing online matches.