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Home › Magazines › 2005 › October › Colossus Jr.

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Colossus Jr.

A data authenticator

Published in issue 347, October 2005

Colossus Jr.
Cryptography is usually thought of as concerned only with keeping secrets, but there is another use for cryptography, which has more to do with keeping things in the open. This other use, which rightly belongs in this issue on All Things Security, is data authentication: techniques for verifying that data has not been tampered with.

Components

Relevant websites

Free downloads

Resistors:

R1,R4,R6,R7 = 22k

R2 = 10k

R3,R5 = 2k2

R8 = 270

Capacitors:

C1 = 100nF

C2 = 22µF 16V radial

C3,C4 = 10µF 16V radial

Semiconductors:

D1 = 1N4148

T1,T2 = BC557B

T3 = BC547B

IC1 = PIC12F675-C/P, programmed. Publishers order code 040267-41*

IC2 = 7805CP

Miscellaneous:

K1 = 9-way sub-D socket (female), PCB edge mounting

K2 = 5-way SIL pinheader

Res1 = 8.000MHz ceramic resonator 

8-way IC socket

RS232 serial cable (non-crossed)

PCB, ref. 040267-1 from The PCBShop

PIC source code files, code 040267-11

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (U051032.pdf)
10 Elektor Credits
PCB layout (040267-PCB.pdf)
10 Elektor Credits
 

Order from Elektor 
PIC12F675-C/P, programmed
040267-41 (USD 6.70)
PCB, bare
040267-1
 

Free downloads 

040267-11.zip

Free download
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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