PERIODIC UPDATING

11-5820-890-10-8

PERIODIC UPDATING

4.7.

COMSEC Keys

4.7a.

Traffic Encryption Key (TEK) must be updated (replaced) at least every

TEK

30 days.

Key Encryption Key (KEK) must be replaced at least every 90 days.

KEK

FH Data

4.7b.

Hopsets do not require periodic change and may remain unchanged

HOPSET

throughout an operation. Hopsets may change at any time because of

operational requirements.

Transmission Security Key (TSK) must be replaced at least every 30

TSK

days, the same frequency as TEK.

Net IDS do not require periodic change and normally remain

NET ID

unchanged throughout an operation. They may be changed at any

time for operational reasons.

SOI Information

4.7c.

The following SOI items change every 24 hours: call signs, suffixes,

DAILY

expanders, CUE frequency, MAN frequency, SC frequencies for

channels 1-6, and sign/countersign.

Smoke and pyrotechnic signals change every 10 days

10 DAYS

Unclassified call words and their associated suffixes and expanders.

NO CHANGE

A five-day package of SOI information is called a set; a ten-day

DEFINITIONS

package is referred to as an edition.

Sync Time

4.7d.

There is no requirement to periodically change sync time. The only

NO REQUIREMENT

requirement is to keep radios within a net, and nets within a command,

on the same sync time.

The operational requirement calls for each NCS to once daily check RT

OPERATIONAL

sync time against GPS time. If the difference is more than one

second, the NCS is expected to adjust the sync time in the NCS radio.

Sync time in net member's radios can then be updated by the NCS

transmitting or merely pressing PTT several times. This sync time

updating procedure ensures that cross -net communications are

readily available to commanders and others who need them.

4-22