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Decabit Code

Tool to encode with pulses or binary via Decabit. Decabit is a system of information transmission via variations of the ripple of electricity.

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Decabit Code -

Tag(s) : Electronics, Telecom

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Decabit Code

Decabit Decoder


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See also: Manchester Code

Decabit Encoder


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See also: ASCII Code

Tool to encode with pulses or binary via Decabit. Decabit is a system of information transmission via variations of the ripple of electricity.

Answers to Questions

What is Decabit?

The decabit is a series of electrical pulses intended to encode data via power lines (alternative current). It is a modulation of the electrical ripple similar to the CPL (current carriers in line), mainly used in Germany and in Europe, for example for the transmission of meter readings.

How to encrypt using Decabit cipher?

The decabit uses a lookup table to encode numbers between 0 and 126 with 10 control pulses with a duration of 600 ms each. In the 10 pulses, there are 5 positive (noted + and 5 negative -) except for the 126 which is ++++++++++.

0 --+-+++-+-1+--+++--+-2+--++-+-+-3+--+-++-+-
4----+++-++5++--+++---6++--++--+-7++--+-+-+-
8++---++-+-9---++++-+-10+-+-+++---11+-+-+-+-+-
12+-+--++-+-13+---++-++-14+---++--++15--+++-++--
16---++-+++-17+---+-++-+18+--++--+-+19+--++-+--+
20+-+++--+--21+--+++-+--22++--+-++--23-+-++-++--
24+--++--++-25+-+++-+---26++-+--++--27+-+-+-++--
28+--+-+++--29+--+--++-+30+-++-++---31+-++-+-+--
32+-+-++-+--33+---++++--34+-+--+-++-35+++--++---
36+++--+-+--37+++---++--38++---+++--39--+-++++--
40++--++-+--41-+-+-+-++-42++----+++-43+----+-+++
44++---+-+-+45++-+-+-+--46++-+-+--+-47+++----++-
48++--+--++-49+--+-+-++-50++++----+-51++-++---+-
52+-+++---+-53-++++---+-54+-+-+---++55+++-++----
56+++-+-+---57+-+-+--++-58-++-+--++-59+++-+----+
60++++-+----61-+++-++---62-+-+-++-+-63++---++--+
64++-+--+--+65++-+++----66++++--+---67+--++++---
68-+-++++---69++-+--+-+-70-++---+++-71+---+-+++-
72--+-+-+++-73+----++++-74--+--++++-75+++---+-+-
76+-++---++-77+--+--+++-78--++--+++-79+-+---+-++
80-+++--+-+-81-+-++-+-+-82-+++---++-83-+-++--++-
84-+---++++-85-++++--+--86-++-++-+--87--++++-+--
88--++-+++--89--++-+-++-90+-++++----91--++++--+-
92--++-++-+-93+--+-+--++94+-++----++95-+-+++--+-
96-++-+-+-+-97-+--++-++-98---+++-++-99-+--+-+++-
100+---+++-+-101-+--+++-+-102+-+-++--+-103+--++-++--
104++-++--+--105+-++--++--106+-+--+++--107-++--+++--
108++---+-++-109++-+---++-110+++-+---+-111+++-+--+--
112++-+-++---113++-++-+---114+-+---+++-115+-++--+-+-
116-+-+--+++-117-+++-+-+--118+-++-+--+-119-++-+++---
120+++--+--+-121+++++-----122-+++++----123--+++++---
124---+++++--125----+++++-126++++++++++

Practically, an alphabet of correspondence between the numbers and the letters must be used, generally the ASCII table, but why not use A1Z26 for simple messages.

The pulses are sometimes denoted in binary with 0 for - and 1 for +.

How to decrypt decabit cipher?

The decabit is read in groups of 10 signals / pulses, each having an associated number between 0 and 126.

Usually the ascii table is associated to encode letters, numbers or text.

Example: -+-++++--- ++-+--+-+- +--++++--- ++-+++---- translates to 68,69,67,65 or DECA in ASCII code.

How to recognize a decabit ciphertext?

Decabit is composed of a series of groups of 10 characters + and -, the vast majority have 5 times the sign + and 5 times the sign -.

Any reference to Power-line communication and electrical pulses are clues.

What are the variants of the Decabit cipher?

The characters + and - may be substituted with other binary characters.

When Decabit have been invented ?

Decabit was allegedly invented by the Zellweger company (Germany) in the late 1960s.

Source code

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