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How to Understand and Utilize the ev1527 Decoder IC

How to Understand and Utilize the ev1527 Decoder IC


The ev1527 is an integrated circuit chip designed for decoding encrypted video signals. It is commonly found in satellite television receivers and other devices that need to decode encrypted video streams. In this article, we will provide an overview of the ev1527 chip and discuss how it works at a high level.

Background on the ev1527

  • The ev1527 is a MPEG2/DVB compliant decoder and descrambler chipset manufactured by EnviVISION.
  • It supports decryption of video streams encrypted with cryptographic algorithms like DES, 3DES, AES128.
  • The chip has multiple interfaces like TS, Parallel, PCI, which allow it to be used in various encryption/decryption hardware systems.
  • It is programmable through registers and supports features like key ladder decryption, payload descrambling, and more.

Understanding the Role of the ev1527

The primary role of the ev1527 chip is to decrypt encrypted video streams and output the clear video for display or processing. Here is a high-level overview of how it accomplishes this:

  • The encrypted video stream is fed into the ev1527 through one of its interfaces like TS or Parallel. This stream contains periodic Entitlement Control Messages (ECMs) containing encryption keys.
  • The ev1527 extracts the encryption keys from the incoming ECMs and stores them in its internal key ladder engine.
  • As each encrypted video packet enters the chip, it uses the appropriate key from the key ladder to decrypt it and restore the clear video.
  • The decrypted clear video is then output via the ev1527’s video interface to be displayed.

Key Features and Applications

Some of the key features and applications of the ev1527 decoder IC include:

  • Satellite TV – A primary use case is in satellite receivers to decrypt encrypted DVB video streams.
  • IPTV – Used in IPTV and OTT boxes for decrypting encrypted video content.
  • Digital Video Recorders – Can allow recording and playback of encrypted video in DVRs.
  • Conditional Access Modules – The ev1527 can be embedded into CAMs for PayTV content decryption.
  • Multiple Algorithms – Supports modern encryption like AES, 3DES, in addition to DES.
  • PCI Interface – The PCI interface allows integration with PCs for software video decryption.


In summary, the ev1527 is a versatile decoder IC that plays a crucial role in decrypting protected video content in various devices and platforms. Understanding its capabilities allows engineers to integrate it into designs for satellite TV, IPTV, payTV, and other applications involving encrypted video streams. However, actual implementation would require extensive expertise in video encryption and legal authorization from content providers.

Frequently Asked Questions

Question 1: How do I obtain the ev1527 chip?

Answer: The ev1527 is not sold directly to consumers. You would need to contact the manufacturer EnviVISION or authorized distributors to purchase it. Proper licensing from the content providers is also required for legal use.

Question 2: Can I use the ev1527 to decrypt video streams without authorization?

Answer: No, using the ev1527 or any other decryption chip to crack encryption without permission is illegal. Proper licensing and authorization from content providers is essential for legal use.

Question 3: What programming skills are needed to use the ev1527?

Answer: Using the ev1527 requires expertise in embedded systems programming (C/C++), video compression codecs, encryption algorithms, and digital rights management systems. Extensive technical skills and legal authorization are prerequisite.

Question 4: Does the ev1527 work for decrypting streams encrypted with AES or 3DES?

Answer: Yes, the ev1527 supports decryption of video streams encrypted with modern algorithms like AES, 3DES, in addition to basic DES. Its programmable key ladder engine can decrypt various encryption methods.

Question 5: Can I extract decryption keys from the ev1527?

Answer: No, the decryption keys are securely stored in the chip’s internal memory and cannot be read out. Attempting to extract keys would require advanced hardware hacking skills and be strictly illegal.

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