§  90.553   Encryption.

   (a) Encryption is permitted on all but the two nationwide
   Interoperability calling channels. Radios employing encryption must
   have a readily accessible switch or other readily accessible control
   that permits the radio user to disable encryption.

   (b) If encryption is employed, then transmitters manufactured after
   August 11, 2014 must use the Advanced Encryption Standard (AES)
   specified in ANSI/TIA-102.AAAD-A: Project 25 Digital Land Mobile
   Radio-Block Encryption Protocol, approved August 20, 2009. Until 2030,
   manufacturers may also include the Digital Encryption Standard (DES) or
   Triple Data Encryption Algorithm (TDEA), in addition to but not in
   place of AES, for compatibility with legacy radios that lack AES
   capability. The Director of the Federal Register approves this
   incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 CFR
   part 51. The standard can also be purchased from TIA/EIA, 2500 Wilson
   Boulevard, Arlington, VA 22201 703-907-7974; Global Engineering
   Documents, 15 Inverness Way East, Englewood, CO 80112; or the American
   National Standards Institute, 25 West 43rd Street, Fourth Floor, New
   York, NY 10036, www.ansi.org. Material incorporated by reference may be
   inspected at the Federal Communications Commission's Reference
   Information Center, located at the address of the FCC's main office
   indicated in 47 CFR 0.401(a), Tel: (202) 418-0270, or at the National
   Archives and Records Administration (NARA). For information on the
   availability of this material at NARA, call 202-741-6030, or go to:
   http://www.archives.gov/federal__register/code__of__federal__regulation
   s/ibr__locations.html.

   (c) The Director of the Federal Register approves this incorporation by
   reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies
   of the standard listed in this section that are incorporated by
   reference may be inspected at the Federal Communications Commission,
   445 12th Street, SW., Washington, DC (Reference Information Center) or
   at the National Archives and Records Administration (NARA). For
   information on the availability of this material at NARA, call
   202-741-6030, or go to:
   http://www.archives.gov/federal__register/code__of__federal__regulation
   s/ibr__locations.html. The standard can also be purchased from TIA/EIA,
   2500 Wilson Boulevard, Arlington, VA, 22201; Global Engineering
   Documents, 15 Inverness Way East, Englewood, CO 80112; or the American
   National Standards Institute, 25 West 43rd Street, Fourth Floor, New
   York, NY 10036 (or via the Internet at www.ansi.org.)

   [ 66 FR 10636 , Feb. 16, 2001, as amended at  67 FR 61006 , Sept. 26, 2002;
    79 FR 39341 , July 10, 2014;  85 FR 64410 , Oct. 13, 2020]