ECHELON is a term associated with a global network of computers that automatically search through millions of intercepted messages for pre-programmed keywords or fax, telex and e-mail addresses. Every word of every message in the frequencies and channels selected at a station is automatically searched. The processors in the network are known as the ECHELON Dictionaries. ECHELON connects all these computers and allows the individual stations to function as distributed elements an integrated system. An ECHELON station's Dictionary contains not only its parent agency's chosen keywords, but also lists for each of the other four agencies in the UKUSA system [NSA, GCHQ, DSD, GCSB and CSE]. (source link)


The following is list of many of the keywords that the ECHELON system searches for in electronic communications such as e-mail, mobile phone text messages and chat programmes:

Explosives, guns, assassination, conspiracy, primers, detonators, initiators, main charge, nuclear charges, ambush, sniping, motorcade, IRS, BATF, jtf-6, mjtf, hrt, srt, hostages, munitions, weapons, TNT, rdx, amfo, hmtd, picric acid, silver nitrite, mercury fulminate, presidential motorcade, salt peter, charcoal, sulfur, c4, composition b, amatol, petn, lead azide, lead styphante, ddnp, tetryl, nitrocellulose, nitrostarch, mines, grenades, rockets, fuses, delay mechanism, mortars, rpg7, propellants, incendiaries, incendiary device, thermite, security forces, intelligence, agencies, hrt, resistance, psyops, infiltration, assault team, defensive elements, evasion, detection, mission, communications, the football, platter charge, shaped charges, m118, claymore, body armor, charges, shrapnel, timers, timing devices, boobytraps, detcord, pmk 40, silencers, Uzi, HK-MP5, AK-47, FAL, Jatti, Skorpion MP, teflon bullets, cordite, napalm, law, Stingers, RPK, SOCIMI 821 SMG, STEN, BAR, MP40, HK-G3,FN-MAG, RPD,PzB39, Air Force One, M60, RPK74, SG530, SG540, Galil arm, Walther WA2000, HK33KE, Parker-Hale MOD. 82, AKR, Ingram MAC10, M3, L34A1, Walther MPL, AKS-74, HK-GR6, subsonic rounds, ballistic media, special forces, JFKSWC, SFOD-D! , SRT, Rewson, SAFE, Waihopai, INFOSEC, ASPIC, Information Security, SAI, Information Warfare, IW, IS, Privacy, Information Terrorism, Kenya, Terrorism Defensive Information, Defense Information Warfare, Offensive Information, Offensive Information Warfare, NAIA, SAPM, ASU, ECHELON ASTS, National Information Infrastructure, InfoSec, SAO, Reno, Compsec, JICS, Computer Terrorism, Firewalls, Secure Internet Connections, RSP, ISS, JDF, Passwords, NAAP, DefCon V, RSO, Hackers, Encryption, ASWS, Espionage, USDOJ, NSA, CIA, S/Key, SSL, FBI, Secret Service, USSS, Defcon, Military, White House, Undercover, NCCS, Mayfly, PGP, SALDV, PEM, resta, RSA, Perl-RSA, MSNBC, bet, AOL, AOL TOS, CIS, CBOT, AIMSX, STARLAN, 3B2, BITNET, Tanzania, SAMU, COSMOS, DATTA, E911, FCIC, HTCIA, IACIS, UT/RUS, JANET, ram, JICC, ReMOB, LEETAC, UTU, VNET, BRLO, SADCC, NSLEP, SACLANTCEN, FALN, 877, NAVELEXSYSSECENGCEN, BZ, CANSLO, CBNRC, CIDA, JAVA, rsta, Awarehouse, Active X, Compsec 97, RENS, LLC, DERA, JIC, ri! p, rb, Wu, RDI, Mavricks, BIOL, Meta-hackers, ^?, SADT, Steve Case, Tools, RECCEX, Telex, OTAN, monarchist, NMIC, NIOG, IDB, MID/KL, NADIS, NMI, SEIDM, BNC, CNCIS, STEEPLEBUSH, RG, BSS, DDIS, mixmaster, BCCI, BRGE, SARL, Military Intelligence, JICA, Scully, recondo, Flame, Infowar, Bubba, Freeh, Donaldson, Archives, ISADC, CISSP, Sundevil, jack, Investigation, JOTS, ISACA, NCSA, ASVC, spook words, RRF, 1071, Bugs Bunny, Verisign, Secure, ASIO, Lebed, ICE, NRO, Lexis-Nexis, NSCT, SCIF, FLiR, JIC, bce, Lacrosse, Bunker, Flashbangs, HRT, IRA, EODG, DIA, USCOI, CID, BOP, FINCEN, FLETC, NIJ, ACC, AFSPC, BMDO, site, SASSTIXS, NAVWAN, NRL, RL, NAVWCWPNS, NSWC, USAFA, AHPCRC, ARPA, SARD, LABLINK, USACIL, SAPT, USCG, NRC, ~, O, NSA/CSS, CDC, DOE, SAAM, FMS, HPCC, NTIS, SEL, USCODE, CISE, SIRC, CIM, ISN, DJC, bemd, SGC, UNCPCJ, CFC, SABENA, DREO, CDA, SADRS, DRA, SHAPE, bird dog, SACLANT, BECCA, DCJFTF, HALO, SC, TA SAS, Lander, GSM, T Branch, AST, SAMCOMM, HAHO, FKS, 868, GCHQ, DITSA, S! ORT, AMEMB, NSG, HIC, EDI, benelux, SAS, SBS, SAW, UDT, EODC, GOE, DOE, SAMF, GEO, JRB, 3P-HV, Masuda, Forte, AT, GIGN, Exon Shell, radint, MB, CQB, CONUS, CTU, RCMP, GRU, SASR, GSG-9, 22nd SAS, GEOS, EADA, SART, BBE, STEP, Echelon, Dictionary, MD2, MD4, MDA, diwn, 747, ASIC, 777, RDI, 767, MI5, 737, MI6, 757, Kh-11, EODN, SHS, ^X, Shayet-13, SADMS, Spetznaz, Recce, 707, CIO, NOCS, Halcon, NSS, Duress, RAID, Uziel, wojo, Psyops, SASCOM, grom, NSIRL, D-11, SERT, VIP, ARC, S.E.T. Team, NSWG, MP5k, SATKA, DREC, DEVGRP, DF, DSD, FDM, GRU, LRTS, SIGDEV, NACSI, MEU/SOC,PSAC, PTT, RFI, ZL31, SIGDASYS, TDM, SUKLO, SUSLO, TELINT, fake, TEXTA, ELF, LF, MF, SIGS, VHF, Recon, peapod, PA598D28, Spall, dort, 50MZ, 11Emc Choe, SATCOMA, UHF, SHF, ASIO, SASP, WANK, Colonel, domestic disruption, 5ESS, smuggle, Z- 200, 15kg, UVDEVAN, RFX, nitrate, OIR, Pretoria, M-14, enigma, Bletchley Park, Clandestine, NSO, nkvd, argus, afsatcom, CQB, NVD, Counter Terrorism Security, SARA, Rapid Reaction, JSOF! C3IP, Corporate Security, Police, sniper, PPS, ASIS, ASLET, TSCM, Security Consulting, M-x spook, Z-150T, High Security, Security Evaluation, Electronic Surveillance, MI-17, ISR, NSAS, Counterterrorism, real, spies, IWO, eavesdropping, debugging, CCSS, interception, COCOT, NACSI, rhost, rhosts, ASO, SETA, Amherst, Broadside, Capricorn, NAVCM, Gamma, Gorizont, Guppy, NSS, rita, ISSO, submiss, ASDIC, .tc, 2EME REP, FID, 7NL SBS, tekka, captain, 226, .45, nonac, .li, Ionosphere, Mole, Keyhole, NABS, Kilderkin, Artichoke, Badger, Emerson, Tzvrif, SDIS, T2S2, STTC, DNR, NADDIS, NFLIS, CFD, quarter, Cornflower, Daisy, Egret, Iris, JSOTF, Hollyhock, Jasmine, Juile, Vinnell, B.D.M., Sphinx, Stephanie, Reflection, Spoke, Talent, Trump, FX, FXR, IMF, POCSAG, rusers, Covert Video, Intiso, r00t, lock picking, Beyond Hope, LASINT, csystems, .tm, passwd, 2600 Magazine, JUWTF, Competitor, EO, Chan, Pathfinders, SEAL Team 3, JTF, Nash, ISSAA, B61-11, Alouette, executive, Event Security,! Mace, Cap-Stun, stakeout, ninja, ASIS, ISA, EOD, Oscor, Merlin, NTT, SL-1, Rolm, TIE, Tie-fighter, PBX, SLI, NTT, MSCJ, MIT, 69, RIT, Time, MSEE, Cable & Wireless, CSE, SUW, J2, Embassy, ETA, Fax, finks, Fax encryption, white noise, Fernspah, MYK, GAFE, forcast, import, rain, tiger, buzzer, N9, pink noise, CRA, M.P.R.I., top secret, Mossberg, 50BMG, Macintosh Security, Macintosh Internet Security, OC3, Macintosh Firewalls, Unix Security, VIP Protection, SIG, sweep, Medco, TRD, TDR, Z, sweeping, SURSAT, 5926, TELINT, Audiotel, Harvard, 1080H, SWS, Asset, Satellite imagery, force, NAIAG, Cypherpunks, NARF, 127, Coderpunks, TRW, remailers, replay, redheads, RX-7, explicit, FLAME, JTF-6, AVN, ISSSP, Anonymous, W, Sex, chaining, codes, Nuclear, 20, subversives, SLIP, toad, fish, data havens, unix, c, a, b, d, SUBACS, the, Elvis, quiche, DES, 1*, NATIA, NATOA, sneakers, UXO, (), OC-12, counterintelligence, Shaldag, sport, NASA, TWA, DT, gtegsc, owhere, .ch, hope, emc, industr! ial espionage, SUPIR, PI, TSCI, spookwords, industrial intelligence, H.N.P., SUAEWICS, Juiliett Class Submarine, Locks, qrss, loch, 64 Vauxhall Cross, Ingram Mac-10, wwics, sigvoice, ssa, E.O.D., SEMTEX, penrep, racal, OTP, OSS, Siemens, RPC, Met, CIA-DST, INI, watchers, keebler, contacts, Blowpipe, BTM, CCS, GSA, Kilo Class, squib, primacord, RSP, Z7, Becker, Nerd, fangs, Austin, no|d, Comirex, GPMG, Speakeasy, humint, GEODSS, SORO, M5, BROMURE, ANC, zone, SBI, DSS, S.A.I.C., Minox, Keyhole, SAR, Rand Corporation, Starr, Wackenhutt, EO, burhop, Wackendude, mol, Shelton, 2E781, F-22, 2010, JCET, cocaine, Vale, IG, Kosovo, Dake, 36,800, Hillal, Pesec, Hindawi, GGL, NAICC, CTU, botux, Virii, CCC, ISPE, CCSC, Scud, SecDef, Magdeyev, VOA, Kosiura, Small Pox, Tajik, +=, Blacklisted 411, TRDL, Internet Underground, BX, XS4ALL, wetsu, muezzin, Retinal Fetish, WIR, Fetish, FCA, Yobie, forschung, emm, ANZUS, Reprieve, NZC-332, edition, cards, mania, 701, CTP, CATO, Phon- e, Chicago! Posse, NSDM, l0ck, spook, keywords, QRR, PLA, TDYC, W3, CUD, CdC, Weekly World News, Zen, World Domination, Dead, GRU, M72750, Salsa, 7, Blowfish, Gorelick, Glock, Ft. Meade, NSWT, press- release, WISDIM, burned, Indigo, wire transfer, e-cash, Bubba the Love Sponge, Enforcers, Digicash, zip, SWAT, Ortega, PPP, NACSE, crypto-anarchy, AT&T, SGI, SUN, MCI, Blacknet, SM, JCE, Middleman, KLM, Blackbird, NSV, GQ360, X400, Texas, jihad, SDI, BRIGAND, Uzi, Fort Meade, *&, gchq.gov.uk, supercomputer, bullion, 3, NTTC, Blackmednet, :, Propaganda, ABC, Satellite phones, IWIS, Planet-1, ISTA, rs9512c, South Africa, Sergeyev, Montenegro, Toeffler, Rebollo, sorot, cryptanalysis, nuclear, 52 52 N - 03 03 W, Morgan, Canine, GEBA, INSCOM, MEMEX, Stanley, FBI, Panama, fissionable, Sears Tower, NORAD, Delta Force, SEAL, virtual, WASS, WID, Dolch, secure shell, screws, Black-Ops, O/S, Area51, SABC, basement, ISWG, $ @, data-haven, NSDD, black-bag, rack, TEMPEST, Goodwin, rebels, ID, MD5, ID! EA, garbage, market, beef, Stego, ISAF, unclassified, Sayeret Tzanhanim, PARASAR, Gripan, pirg, curly, Taiwan, guest, utopia, NSG, orthodox, CCSQ, Alica, SHA, Global, gorilla, Bob, UNSCOM, Fukuyama, Manfurov, Kvashnin, Marx, Abdurahmon, snullen, Pseudonyms, MITM, NARF, Gray Data, VLSI, mega, Leitrim, Yakima, NSES, Sugar Grove, WAS, Cowboy, Gist, 8182, Gatt, Platform, 1911, Geraldton, UKUSA, veggie, XM, Parvus, NAVSVS, 3848, Morwenstow, Consul, Oratory, Pine Gap, Menwith, Mantis, DSD, BVD, 1984, blow out, BUDS, WQC, Flintlock, PABX, Electron, Chicago Crust, e95, DDR&E, 3M, KEDO, iButton, R1, erco, Toffler, FAS, RHL, K3, Visa/BCC, SNT, Ceridian, STE, condor, CipherTAC-2000, Etacs, Shipiro, ssor, piz, fritz, KY, 32, Edens, Kiwis, Kamumaruha, DODIG, Firefly, HRM, Albright, Bellcore, rail, csim, NMS, 2c, FIPS140-1, CAVE, E-Bomb, CDMA, Fortezza, 355ml, ISSC, cybercash, NAWAS, government, NSY, hate, speedbump, joe, illuminati, BOSS, Kourou, Misawa, Morse, HF, P415, ladylove, fi! lofax, Gulf, lamma, Unit 5707, Sayeret Mat'Kal, Unit 669, Sayeret Golani, Lanceros, Summercon, NSADS, president, ISFR, freedom, ISSO, walburn, Defcon VI, DC6, Larson, P99, HERF pipe-bomb, 2.3 Oz., cocaine, $, impact, Roswell, ESN, COS, E.T., credit card, b9, fraud, ST1, assassinate, virus, ISCS, ISPR, anarchy, rogue, mailbomb, 888, Chelsea, 1997, Whitewater, MOD, York, plutonium, William Gates, clone, BATF, SGDN, Nike, WWSV, Atlas, IWWSVCS, Delta, TWA, Kiwi, PGP 2.6.2., PGP 5.0i, PGP 5.1, siliconpimp, SASSTIXS, IWG, Lynch, 414, Face, Pixar, IRIDF, NSRB, eternity server, Skytel, Yukon, Templeton, Johohonbu, LUK, Cohiba, Soros, Standford, niche, ISEP, ISEC, 51, H&K, USP, ^, sardine, bank, EUB, USP, PCS, NRO, Red Cell, NSOF, Glock 26, snuffle, Patel, package, ISI, INR, INS, IRS, GRU, RUOP, GSS, NSP, SRI, Ronco, Armani, BOSS, Chobetsu, FBIS, BND, SISDE, FSB, BfV, IB, froglegs, JITEM, SADF, advise, TUSA, LITE, PKK, HoHoCon, SISMI, ISG, FIS, MSW, Spyderco, UOP, SSCI, NIMA, HAMASMOIS, SVR, SIN, advisors, SAP, Monica, OAU, PFS, Aladdin, AG, chameleon man, Hutsul, CESID, Bess, rail gun, .375, Peering, CSC, Tangimoana Beach, Commecen, Vanuatu, Kwajalein, LHI, DRM, GSGI, DST, MITI, JERTO, SDF, Koancho, Blenheim, Rivera, Kyudanki, varon, 310, 17, 312, NB, CBM, CTP, Sardine, SBIRS, jaws, SGDN, ADIU, DEADBEEF, IDP, IDF, Halibut, SONANGOL, Flu, &, Loin, PGP 5.53, meta, Faber, SFPD, EG&G, ISEP, blackjack, Fox, Aum, AIEWS, AMW, RHL, Baranyi, WORM, MP5K-SD, 1071, WINGS, cdi, VIA, DynCorp, UXO, Ti, WWSP, WID, osco, Mary, honor, Templar, THAAD, package, CISD, ISG, BIOLWPN, JRA, ISB, ISDS, chosen, LBSD, van, schloss, secops, DCSS, DPSD, LIF, PRIME, SURVIAC, telex, SP4, Analyzer, embassy, Golf, B61-7, Maple, Tokyo, ERR, SBU, Threat, JPL, Tess, SE, EPL, SPINTCOM, ISS-ADP, Merv, Mexico, SUR, SO13, Rojdykarna, airframe, 510, EuroFed, Avi, shelter, Crypto AG. (source link)