Crypto chip

Crypto chip

Disclaimer I have never worked with crypto machines and do not have access to any classified information. No classified information appears on this or any of my other web pages. All the information is from open sources such as the crypto chip and non classified manuals.

Army nomenclature, CSP-488 is the Navy name. The M-138-A is a strip cipher version. Used through the end of W. Used with a large number of radios for both voice, fax and data. Used with PRC-104 and other H. What encryption system, what will it interoperate with? Replaces the KY-57 and other equipment.

Uses a 40 character key based on 5-level paper tape. Originally designed to work with the PRC-77. Uses thumb-wheel switches to set key. There may be a shut down function that works by unit serial number. PSN-11 GPS Receiver Can use a crypto key for reception of the GPS L2 frequency.

Quantic Q5200 GPS Time Receiver Can use a crypto key for reception of the GPS L2 frequency. ASN-169 Version of the Trimpack that decodes encrypted L1 to avoid problems when SA was turned on. Requires key load for encrypted signals but works as civilian receiver without keys. This is the most common digital data application. Q modulation for Tx and Rx.

Most likely that the missing control box contains some type of encryption that would allow the spy to compose a message in the field and send it as well as decrypt an incoming message. This would require inputting a key. If the missing control box did not contain any crypto function it may not have been destroyed. That’s an area that I’m interested in, but not one where I have a collection of equipment.

Harris KGV-72 Would use the Sierra II’ crypto chip which is the basis of all the Type 1 cryptography. But this is a new empty box. There are a number of different things that can be filled. SINCGARS or Have Quick hop set telling the radio what frequencies are allowed for frequency hopping.

SINCGARS or Have Quick lockout set telling the radio what frequencies not to use. There are two electrical formats for key fill. CYZ-10 and DS-102 like used with the old KOI-18 paper tape reader. KOI-18  5810-01-026-9620 Tape Reader General Purpose DS-102 protocol. KY-57 and  about anything that needs a key. It uses a photo optical reader to read a paper tape that’s pulled through the reader by hand.

Very versatile since what comes out depends on what is punched on the tape. Other key loaders have electronic registers that can only hold keys in predetermined formats. Fig 14 Note grouped as 3-space-5. The space is where the sprocket holes are. Fig 15 The rod with the blue tape seems to be made of carbon and is the common ground for the wire fingers that sense the 8 data holes.

Note there is no sensor for the sprocket holes. I’ve heard that it uses 8 level ASCII type tapes rather than the older 5 level Baudot tapes. This is important since the leading edge of the sprocket hole can be used to latch the data bits and the trailing edge of the sprocket hole can be used to shift out the data bits. This would not work if all the holes were the same diameter. In the old mechanical tape readers, like on the Teletype Corp. Model ASR33 machine, there was a plastic wheel with pins that match the sprocket holes and it pulled the tape through a reader that worked using mechanical pins to sense each data hole. Inside there’s probably a parallel in – serial out shift register.