{
  "url": "https://proudtek.com/compare/125khz-vs-13.56mhz-rfid/",
  "sourceUrl": "https://proudtek.com/compare/125khz-vs-13.56mhz-rfid/",
  "title": "125 kHz Vs 13.56 MHz RFID — LF Vs HF Compared",
  "description": "125 kHz (low frequency) and 13.56 MHz (high frequency) are the two RFID bands still fighting each other in the access-control cabinet. 125 kHz is the...",
  "kind": "article",
  "imageUrl": "https://proudtek.com/landing-images/125khz-vs-13.56mhz-rfid-hero.jpg",
  "imageAlt": "Assorted RFID keyfobs in red, blue, green, black and white with metal key rings on a gray surface",
  "imageGallery": [
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      "url": "https://proudtek.com/landing-images/125khz-vs-13.56mhz-rfid-hero.jpg",
      "alt": "Assorted RFID keyfobs in red, blue, green, black and white with metal key rings on a gray surface"
    }
  ],
  "breadcrumbs": [
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      "name": "Home",
      "url": "https://proudtek.com/"
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      "url": "https://proudtek.com/compare/"
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    {
      "name": "125 kHz Vs 13.56 MHz RFID — LF Vs HF Compared",
      "url": "https://proudtek.com/compare/125khz-vs-13.56mhz-rfid/"
    }
  ],
  "summary": [
    "125 kHz (low frequency) and 13.56 MHz (high frequency) are the two RFID bands still fighting each other in the access-control cabinet."
  ],
  "faq": [
    {
      "question": "Can we use dual-frequency cards during a 125 kHz to 13.56 MHz migration?",
      "answer": "Yes, and it is the only sane way to migrate a deployment larger than about fifty doors. A dual-frequency card contains both a 125 kHz chip (EM4100 or T5577) and a 13.56 MHz chip (MIFARE Classic, MIFARE Plus, or DESFire EV3) in the same ISO 7810 CR80 card body. During the migration the card works on every legacy 125 kHz reader and on every new 13.56 MHz reader simultaneously. After the last reader swap, the LF chip becomes dormant. Proud Tek manufactures dual-frequency cards in volumes from 500 to 500,000 per order."
    },
    {
      "question": "How easily can 125 kHz access cards be cloned?",
      "answer": "Standard EM4100 125 kHz cards clone in under three seconds using handheld RFID copiers that cost $20-$50 on Amazon or Alibaba. The card broadcasts its 40-bit serial number as unencrypted Manchester-encoded ASK, so any device within range reads and duplicates it without the owner noticing. HID ProxCard II is marginally harder. A Proxmark3 RDV4 at $350 breaks it in about thirty seconds. This cloning attack is the single strongest argument for migrating any security-sensitive 125 kHz deployment to DESFire EV3 on 13.56 MHz."
    },
    {
      "question": "Is MIFARE Classic 1K secure enough for access control?",
      "answer": "For practical purposes, no. The Crypto-1 cipher MIFARE Classic uses has been publicly broken since 2008. A Proxmark3 plus free software extracts all sixteen sector keys in about ten minutes, and the cloned credential is indistinguishable from the original. MIFARE Classic is acceptable for very low-value applications (campus vending, library cards) but should never be used for physical access control to anywhere with valuable assets, regulated data, or staff safety concerns. For genuinely secure access control use MIFARE DESFire EV3 with AES-128 encryption or MIFARE Plus SL3."
    },
    {
      "question": "Do the two bands interfere with each other?",
      "answer": "No. 125 kHz and 13.56 MHz are four orders of magnitude apart in frequency and do not interfere, so a card with both chips in it works reliably and readers of either type ignore the other band entirely. The only installation concern is physical. The two antennas share the card body, so dual-frequency cards are typically slightly thicker (0.86-0.90 mm) than single-frequency cards (0.76-0.82 mm) and should be specified with the customer's lock manufacturer to confirm slot tolerance."
    },
    {
      "question": "Does 13.56 MHz work with existing HID iCLASS readers?",
      "answer": "It depends on the iCLASS generation. Original iCLASS (iCLASS Standard, iCLASS SE firmware below 1.1) uses a proprietary HID key structure that is not interoperable with open MIFARE DESFire. iCLASS SE multiClass readers and Signo readers support MIFARE DESFire EV1/EV2/EV3 natively with a firmware configuration, and can read legacy iCLASS credentials at the same time. If your deployment is on original iCLASS and you want to migrate to DESFire EV3, the path is typically to swap readers to iCLASS SE multiClass or another multi-technology reader line, then transition credentials over one to two years."
    },
    {
      "question": "What about mobile credentials — do they work on both bands?",
      "answer": "Mobile credentials only work on 13.56 MHz. The NFC radio in every iPhone shipped since the iPhone 7, and in every NFC-enabled Android phone, communicates on the 13.56 MHz ISO 14443 standard. There is no 125 kHz radio in any consumer smartphone and there never will be. The antenna size alone makes it impractical. If mobile-credential capability via Apple Wallet, Google Wallet, HID Mobile Access, or LEGIC mobile is a requirement, 13.56 MHz is the only option. Mobile credentials cost roughly $2-$5 per user per year in licensing and typically replace plastic-card issuance for 20-50% of staff in a mature deployment."
    },
    {
      "question": "Should we upgrade OSDP at the same time as LF to HF?",
      "answer": "Usually yes. The LF-to-HF migration is typically done by swapping readers, and the same reader swap is the only chance to upgrade from Wiegand 26 to OSDP v2 Secure Channel without a second labor cycle. Wiegand's unencrypted two-wire output can be sniffed and replayed with a $10 ESPKey, which defeats the purpose of upgrading to DESFire EV3 if the reader-to-panel link is still clear-text. Bundling both upgrades in the same project roughly doubles the security improvement for a modest increment in reader cost (OSDP-capable readers are typically $20-$40 more than Wiegand-only readers in the same family)."
    }
  ],
  "procurementFields": [],
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  "articleGuidanceFields": [
    {
      "label": "Best for",
      "value": "125 kHz Vs 13.56 MHz RFID — LF Vs HF Compared supports RFID and NFC evaluation, comparison, and sourcing decisions."
    },
    {
      "label": "Compare first",
      "value": "Compare 125 kHz Vs 13.56 MHz RFID — LF Vs HF Compared against reader compatibility, chip family, material, and deployment environment."
    },
    {
      "label": "What to confirm",
      "value": "Confirm target application, compatibility requirements, customization needs, quantity, and sample expectations before quoting 125 kHz Vs 13.56 MHz RFID — LF Vs HF Compared."
    }
  ],
  "sourceLinks": [],
  "related": [],
  "productSpecs": [],
  "machineJsonUrl": "https://proudtek.com/machine/compare/125khz-vs-13.56mhz-rfid.json",
  "machineTextUrl": "https://proudtek.com/machine/compare/125khz-vs-13.56mhz-rfid.txt",
  "author": {
    "name": "Peter Zhang",
    "title": "Founder & CEO",
    "expertise": [
      "RFID/NFC industry strategy",
      "Technology standards (ISO 14443, ISO 18000-63)",
      "Market trends",
      "System architecture"
    ]
  },
  "publisher": "Proud Tek Co., Limited",
  "datePublished": "2026-04-19",
  "dateModified": "2026-06-10T18:00:00Z",
  "reviewedBy": "Proud Tek Editorial Team",
  "lastReviewedDate": "2026-06-10T18:00:00Z",
  "credentials": [
    "ISO 9001:2015",
    "ISO 14001:2015",
    "RoHS Compliant",
    "CE Marking",
    "REACH Compliant"
  ],
  "generatedAt": "2026-03-16T01:42:30.697Z"
}