#Ht22i key card encoder edht22i code
Note that the lookahead value effectively reduces the keyspace of the code key value. This allows the lock to automatically invalidate old cards when new ones are used. When a valid card is introduced to the lock, the lock's code key value is moved up to the value on the card. If a guest card with a code key value of 123 is used in a door with a code key value of 100, the lookahead value needs to be at least 23 for that card to be valid. The lock is programmed with a lookahead value, generally 50, which determines how far ahead of the lock a keycard can be and still function. Rather than programming the lock anew for every guest or when master keycards need to be made, a concept called 'card cycling' is used. A lock contains a guest code key value and generally one or more master code key values. The sitecode is used for encrypting/decrypting cards, programming the locks, and opening the locks.įor this reason, the sitecode is not ordinarily exposed to anyone, even property owners.Ĭode key values consist of 24 bits of data and are used to gain entry to locks. It uniquely identifies a hotel property and is the key to the security of the entire system.
This is a 32-bit code randomly assigned by Onity.
We are primarily concerned with the PP and the lock, though the encoder plays an important role in the system as it handles cryptography on cards. exterior doors and guest room doors, but we'll be talking mostly about guest room locks. There are multiple lock configurations, e.g. Lock: In our context, we're primarily concerned with the actual circuit board that performs the locking logic for doors.
#Ht22i key card encoder edht22i portable
Portable programmer (or PP): Programs the lock with guest code key values, master codes, time tables, and other information. room listings, time tables, etc) and is used to load the portable programmer. There are several parts to the Onity lock system:Įncoder: This is the device which makes the keycards, but it also stores all the property information (e.g. We hope to reveal unique insight into the way the Onity HT system works and detail various vulnerabilities therein. This accounts for over half of all the installed hotel locks and can be found in approximately a third of all hotels. Approximately ten million Onity HT locks are installed in hotels worldwide. In this paper we will discuss the design and inner workings of the Onity HT lock system for hotels.
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